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Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . IllWTIOU lAKK SPECIAL SHEET SHEET Wll. lllXTKR PARK SlKCIAL SIIEKT Stock Photo

RM2AJ0AAH–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . IllWTIOU lAKK SPECIAL SHEET SHEET Wll. lllXTKR PARK SlKCIAL SIIEKT

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . JJ^^Z I.KNAIM) sri:ciAi, SUKKT GEOLOGY SHEET XX -:::^ HI. Stock Photo

RM2AJ08R7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . JJ^^Z I.KNAIM) sri:ciAi, SUKKT GEOLOGY SHEET XX -:::^ HI.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASlKN MOlNTAIN SIIKKT. Stock Photo

RM2AJ02DD–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASlKN MOlNTAIN SIIKKT.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . . I 1,- ASIK.X MOIXTAIX SI1KK Stock Photo

RM2AJ0652–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . . I 1,- ASIK.X MOIXTAIX SI1KK

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XIII SKCTIUNS Stock Photo

RM2AJ0HEM–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XIII SKCTIUNS

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . TOlRTKLOTTK IAUK SlKClAI. SUKKT. SHEET XVI TOPOGRAPHY Stock Photo

RM2AJ0FXA–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . TOlRTKLOTTK IAUK SlKClAI. SUKKT. SHEET XVI TOPOGRAPHY

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . Ml(i<iLKli MolXTAlN. Stock Photo

RM2AJ04CM–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . Ml(i<iLKli MolXTAlN.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . 1 M 1 ! /ill ?MO ^TV-^^ II. Stock Photo

RM2AJ0M46–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . 1 M 1 ! /ill ?MO ^TV-^^ II.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . I 1,- ASIK.X MOIXTAIX SI1KK. SHEET XXVI SECTIONS Stock Photo

RM2AJ0616–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . I 1,- ASIK.X MOIXTAIX SI1KK. SHEET XXVI SECTIONS

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT WIN SKCTIO. ASlKN MOlNTAIN SIIKKT Stock Photo

RM2AJ03A7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT WIN SKCTIO. ASlKN MOlNTAIN SIIKKT

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . EASTASI ASPEN SPECIAL Stock Photo

RM2AJ0JWM–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . EASTASI ASPEN SPECIAL

RM2AJ0JP7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . EASTASI ASPEN SPECIAL.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . TOlRTKLOTTK IAUK SlKClAI. SUKKT Stock Photo

RM2AJ0G76–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . TOlRTKLOTTK IAUK SlKClAI. SUKKT

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASPKN DISTHICT SHKKT ? S1IKKT VIII TOIOlillAlHY Stock Photo

RM2AJ0KNG–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASPKN DISTHICT SHKKT ? S1IKKT VIII TOIOlillAlHY

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SI IK LOT XI TOliKiliAIMlY ,ok, -- vv B!i TOURTELOTTE PARK SPECIAL -a : -Rt 11 %. Stock Photo

RM2AJ0HTY–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SI IK LOT XI TOliKiliAIMlY ,ok, -- vv B!i TOURTELOTTE PARK SPECIAL -a : -Rt 11 %.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . Stock Photo

RM2AJ0KT1–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT WIN SKCTIO Stock Photo

RM2AJ03TK–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT WIN SKCTIO

RM2AJ093R–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . JJ^^Z I.KNAIM) sri:ciAi, SUKKT GEOLOGY SHEET XX -:::^ HI

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . COPPER HI;lL. Stock Photo

RM2AJ07F8–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . COPPER HI;lL.

RM2AJ0NE7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

RM2AJ07NW–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . COPPER HI;lL

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASIKX DISTRICT SIIKKT SHEET VII SECTIO]. 1 M 1 ! /ill ?MO ^TV-^^ II Stock Photo

RM2AJ0MD6–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASIKX DISTRICT SIIKKT SHEET VII SECTIO]. 1 M 1 ! /ill ?MO ^TV-^^ II

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . lllXTKR PARK SlKCIAL SIIEKT. m^ m&j, Stock Photo

RM2AJ09KF–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . lllXTKR PARK SlKCIAL SIIEKT. m^ m&j,

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . KOI.miY AND TOIOtJKAIHV SIIK Stock Photo

RM2AJ04RR–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . KOI.miY AND TOIOtJKAIHV SIIK

RM2AJ0KCX–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASPKN DISTHICT SHKKT ? S1IKKT VIII TOIOlillAlHY.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . IOLOGY SHEET VI ? XPfiilllilllllifllll. Stock Photo

RM2AJ0NN4–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . IOLOGY SHEET VI ? XPfiilllilllllifllll.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XXIV SKCII Stock Photo

RM2AJ0747–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XXIV SKCII

RM2AJ085G–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

RM2AJ0806–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

RM2AJ0N1G–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SHEET XXVI SECTIONS. Stock Photo

RM2AJ05HR–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SHEET XXVI SECTIONS.

RM2AJ01T7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado .

RM2AJ06J3–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XXIV SKCII.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . m^ m&j,. Stock Photo

RM2AJ0992–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . m^ m&j,.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASIKX DISTRICT SIIKKT SHEET VII SECTIO] Stock Photo

RM2AJ0MT7–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . ASIKX DISTRICT SIIKKT SHEET VII SECTIO]

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SHEET XVI TOPOGRAPHY. IllWTIOU lAKK SPECIAL SHEET SHEET Wll Stock Photo

RM2AJ0FEH–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SHEET XVI TOPOGRAPHY. IllWTIOU lAKK SPECIAL SHEET SHEET Wll

RM2AJ0GKJ–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . SIIKKT XIII SKCTIUNS.

Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . J. SI IK LOT XI TOliKiliAIMlY ,ok, -- vv B!i TOURTELOTTE PARK SPECIAL -a : -Rt 11 % Stock Photo

RM2AJ0J73–Atlas to accompany monograph XXXI on the geology of the Aspen District, Colorado . J. SI IK LOT XI TOliKiliAIMlY ,ok, -- vv B!i TOURTELOTTE PARK SPECIAL -a : -Rt 11 %

$. The fluorspar deposits of southern Illinois . V, L ^r ^) LEGEND 0^ L amp roplvT?(?, dikes arid sTuets; Maiisfield ScQidstone , sandst-ane. and,con^lomejate ; Birds^olle, Tribuneand Cypress smidsloue ^scaid^oThe aitd s7talf iOtin Ste.Geneyierp liniesloiiei oolitic Jiiiiestom ^ ^^m^ StLouis limestone{ckertf limestone i Veins Faults TulIaJioiua Imestoiierherir 7iiiirstj7ii - OMo sliale lI black shale/ X. Sti-iki> aiiddip ISIAP AND CROSS SECTION, ROSICLAEE TO KARBERS RIDGE, ILL BVH.FOSTER BxMX ASSISTED BTAF.CRIDER ,^XD E.O.ULRTCHScaleo >•= 1 2 3 imiles BAIN.] GEOLOGY. 31 GEOLOGIC STRUCT Stock Photo$

RM2CD9K1T–. The fluorspar deposits of southern Illinois . V, L ^r ^) LEGEND 0^ L amp roplvT?(?, dikes arid sTuets; Maiisfield ScQidstone , sandst-ane. and,con^lomejate ; Birds^olle, Tribuneand Cypress smidsloue ^scaid^oThe aitd s7talf iOtin Ste.Geneyierp liniesloiiei oolitic Jiiiiestom ^ ^^m^ StLouis limestone{ckertf limestone i Veins Faults TulIaJioiua Imestoiierherir 7iiiirstj7ii - OMo sliale lI black shale/ X. Sti-iki> aiiddip ISIAP AND CROSS SECTION, ROSICLAEE TO KARBERS RIDGE, ILL BVH.FOSTER BxMX ASSISTED BTAF.CRIDER ,^XD E.O.ULRTCHScaleo >•= 1 2 3 imiles BAIN.] GEOLOGY. 31 GEOLOGIC STRUCT

. The fluorspar deposits of southern Illinois . ) of very impure limestone containing notable quan-tities of silica and iron oxide. This banding represents horizontalbedding, and the fluorite has evidently been introduced along thestratification planes, uniting with the calcium of the limestone andexcluding the impurities. These were partly, no doubt, carried off,but also in part remain traj^ped between the growing crystals offluorite and in the bands of unreplaced limestone. These relations are perhaps made clearer by the photomicrographsof PL VI. In .1 is shown, in natural light, a portion o Stock Photo

RM2CD9JR0–. The fluorspar deposits of southern Illinois . ) of very impure limestone containing notable quan-tities of silica and iron oxide. This banding represents horizontalbedding, and the fluorite has evidently been introduced along thestratification planes, uniting with the calcium of the limestone andexcluding the impurities. These were partly, no doubt, carried off,but also in part remain traj^ped between the growing crystals offluorite and in the bands of unreplaced limestone. These relations are perhaps made clearer by the photomicrographsof PL VI. In .1 is shown, in natural light, a portion o

. The fluorspar deposits of southern Illinois . ecflo Y v>v. -1- S^ I . . I lUJPS^ O or Riv^« -/c ^ X. LEGEND JULIUS BIEN »CO. LiTH, N.^ • ivlaceousand Ierliars- Pennsvhmiian/ Coaiyieasure.?/ Missi.ssip[iianorebeanru:/ J Devonianf BiadislcUe) Dikes GENERMJZED GEOLOGIC MAPKENTUCK-ILLIN01S FLUORSPAR UISTRRT 15 lO Scale 15 miles BAIN.] PHYSIOGRAPHY. 15 counties by Karbers Ridge, and its northern limit is defined by theSouth Fork of Saline River and certain tributaries of the Big Muddy.The Interior Lowland has in this area a general altitude of 500 feet.It merges with the Gulf Plains a Stock Photo

RM2CD9TF0–. The fluorspar deposits of southern Illinois . ecflo Y v>v. -1- S^ I . . I lUJPS^ O or Riv^« -/c ^ X. LEGEND JULIUS BIEN »CO. LiTH, N.^ • ivlaceousand Ierliars- Pennsvhmiian/ Coaiyieasure.?/ Missi.ssip[iianorebeanru:/ J Devonianf BiadislcUe) Dikes GENERMJZED GEOLOGIC MAPKENTUCK-ILLIN01S FLUORSPAR UISTRRT 15 lO Scale 15 miles BAIN.] PHYSIOGRAPHY. 15 counties by Karbers Ridge, and its northern limit is defined by theSouth Fork of Saline River and certain tributaries of the Big Muddy.The Interior Lowland has in this area a general altitude of 500 feet.It merges with the Gulf Plains a

. The fluorspar deposits of southern Illinois . PHOTOMICROGRAPHS OF FLUORSPAR BANDS IN ORE BODY AT LEAD HILL. BAIN.] MINES AND PBOSFECTS. 57 the presence of minute grains and crystals of calcite and quartz. Thebedding may still be made out, but the outlines of the calcite crystalsare completely obscured. The very intimate association of the calciteand fluorite are notable and indicate the entire penetration of the rockby the fluorine. The calcite of the large crystal in the lower portionof the field has been partly replaced by fluorite, the bounding planesbeing evidently determined by the clea Stock Photo

RM2CD9CW2–. The fluorspar deposits of southern Illinois . PHOTOMICROGRAPHS OF FLUORSPAR BANDS IN ORE BODY AT LEAD HILL. BAIN.] MINES AND PBOSFECTS. 57 the presence of minute grains and crystals of calcite and quartz. Thebedding may still be made out, but the outlines of the calcite crystalsare completely obscured. The very intimate association of the calciteand fluorite are notable and indicate the entire penetration of the rockby the fluorine. The calcite of the large crystal in the lower portionof the field has been partly replaced by fluorite, the bounding planesbeing evidently determined by the clea

. The fluorspar deposits of southern Illinois . between it and theCypress sandstime in the Rosiclare area. In addition, it occurs botheast and north of Cave in Rock, near Shetlerville, Eichorn, and atvarious other points which will l)e more particularly noted indescribing the various mines. Its significance in the present dis-cussion arises from the fact that the important ore bodies so farfound have been in most cases closely associated with this limestone. Nanie and correlation.—In the work of Engelmann and Worthenthe Ste. Genevieve limestone was not discriminated from the St.Louis and the g Stock Photo

RM2CD9MHA–. The fluorspar deposits of southern Illinois . between it and theCypress sandstime in the Rosiclare area. In addition, it occurs botheast and north of Cave in Rock, near Shetlerville, Eichorn, and atvarious other points which will l)e more particularly noted indescribing the various mines. Its significance in the present dis-cussion arises from the fact that the important ore bodies so farfound have been in most cases closely associated with this limestone. Nanie and correlation.—In the work of Engelmann and Worthenthe Ste. Genevieve limestone was not discriminated from the St.Louis and the g

. The fluorspar deposits of southern Illinois . he honor to transmit herewith the manuscript ofa paper entitled Fhiorspar Deposits of Southern Illinois, byH. Foster Bain, and to recommend that it be published as a bulletin.This paper embodies the results obtained in a detailed study of thefluorspar deposits of this important district, the study having beenundertaken in connection with the investigation of the lead and zincdeposits of the Mississippi Valley region. The area covered is atpresent the most important producer of fluorspar in the UnitedStates. Very respectfully, C. W. Hayes, Geologi Stock Photo

RM2CD9Y6B–. The fluorspar deposits of southern Illinois . he honor to transmit herewith the manuscript ofa paper entitled Fhiorspar Deposits of Southern Illinois, byH. Foster Bain, and to recommend that it be published as a bulletin.This paper embodies the results obtained in a detailed study of thefluorspar deposits of this important district, the study having beenundertaken in connection with the investigation of the lead and zincdeposits of the Mississippi Valley region. The area covered is atpresent the most important producer of fluorspar in the UnitedStates. Very respectfully, C. W. Hayes, Geologi

. The fluorspar deposits of southern Illinois . uthern Illinois. System. Quaternary Tertiary Carboniferous Formation. Lafayette (?) Character. Loess loam. Gravels. Mansfield Sandstone and conglomerate. Birdsville Sandstone, shale, and thin limestones. Tribune Limestones. Cypress Heavy-bedded sandstone. Ste. Genevieve St. Louis Tullahoma Devonian Ohio Oolitic limestones.Limestones and chert.Chert and limestone. Black shale. DESCRIPTION OF SEDIMENTARY FORMATIONS.DEVONIAN ROCKS. OHIO SHALE. Character.—TQ Ohio shale as developed in this area is a black,fissile shale or slate. It splits in very t Stock Photo

RM2CD9R8G–. The fluorspar deposits of southern Illinois . uthern Illinois. System. Quaternary Tertiary Carboniferous Formation. Lafayette (?) Character. Loess loam. Gravels. Mansfield Sandstone and conglomerate. Birdsville Sandstone, shale, and thin limestones. Tribune Limestones. Cypress Heavy-bedded sandstone. Ste. Genevieve St. Louis Tullahoma Devonian Ohio Oolitic limestones.Limestones and chert.Chert and limestone. Black shale. DESCRIPTION OF SEDIMENTARY FORMATIONS.DEVONIAN ROCKS. OHIO SHALE. Character.—TQ Ohio shale as developed in this area is a black,fissile shale or slate. It splits in very t

. The fluorspar deposits of southern Illinois . BULLETIN NO. 255 PL. II 8 E. frr Landing I I GEOLOGIC MAP OF THE PvOSICLARE DISTRICTILLINOIS BY H.FOSTER BAIN. ASSISTED BYE.O.ULRICHAND A.F.CRIDER y^ Scale V-2 mile LEG EN D tL Lamprophyre / dike^ and sheets I Mansfield sandstone /sandstone and Cong torn erate / BirdsviUe.Tribuue.and C>pre3s sandstone /sandstone, andshale.rhinltJ7i^stom near middle f Ste.Genevievelimestone I oolitic limestone I St.Louis limestone ( cherty limestone ) Veins Faults X Mines ^ Strike and dip JULIUS BlENa 00 LITH PAIN.] DEVONIAN AND CARBONIFEROUS ROCKS. 19 pebble Stock Photo

RM2CD9PB9–. The fluorspar deposits of southern Illinois . BULLETIN NO. 255 PL. II 8 E. frr Landing I I GEOLOGIC MAP OF THE PvOSICLARE DISTRICTILLINOIS BY H.FOSTER BAIN. ASSISTED BYE.O.ULRICHAND A.F.CRIDER y^ Scale V-2 mile LEG EN D tL Lamprophyre / dike^ and sheets I Mansfield sandstone /sandstone and Cong torn erate / BirdsviUe.Tribuue.and C>pre3s sandstone /sandstone, andshale.rhinltJ7i^stom near middle f Ste.Genevievelimestone I oolitic limestone I St.Louis limestone ( cherty limestone ) Veins Faults X Mines ^ Strike and dip JULIUS BlENa 00 LITH PAIN.] DEVONIAN AND CARBONIFEROUS ROCKS. 19 pebble

. The fluorspar deposits of southern Illinois . INTERBANDED FLUORSPAR AND LIMESTONE FROM LEAD HILL. PLATE VI. 55 PLATE VI. PHOTO^riCROGRAPHS OF FLIT)KSrAR BANDS IN ORE BODY AT LEAD HILL. A.—Natural light, showing granular outline of original calcite particles. P,.—Polarized light, showing complete penetration of original calcite (white) by lludiiiic n;)w forming tlnorsjjar (black).C.—Natural light, showing preservation of original bedding plane in clear Uuorspar. 56 i U. S. GEOLOGICAL SURVEY BULLETIN NO. 265 PL. VI. Stock Photo

RM2CD9G4X–. The fluorspar deposits of southern Illinois . INTERBANDED FLUORSPAR AND LIMESTONE FROM LEAD HILL. PLATE VI. 55 PLATE VI. PHOTO^riCROGRAPHS OF FLIT)KSrAR BANDS IN ORE BODY AT LEAD HILL. A.—Natural light, showing granular outline of original calcite particles. P,.—Polarized light, showing complete penetration of original calcite (white) by lludiiiic n;)w forming tlnorsjjar (black).C.—Natural light, showing preservation of original bedding plane in clear Uuorspar. 56 i U. S. GEOLOGICAL SURVEY BULLETIN NO. 265 PL. VI.

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL.GEOL.SOC AM. VOL 3.1S91FL 5.. MICROSCOPIC SECTIONS OF SILURIAN 'ORDIVICIAN FISH REMAINS FROM COLORADO.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF4D–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL.GEOL.SOC AM. VOL 3.1S91FL 5.. MICROSCOPIC SECTIONS OF SILURIAN 'ORDIVICIAN FISH REMAINS FROM COLORADO.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. .", 1 c. i». WALCOTT—A DISPLACEMENT IN" THE GRAND CANON. fiuiIt continues several miles, the strata n the thrown Bide sometimes ap- proaching the fault almosl horizontally, but usually bending somewhat abruptly upward. They often stand vertically, and arc bo metamorphosed, flattened out, or compressed, that little of the original appearance of the ruck remains. Figure 5 represents a cross-section of the ridge south of Kwa-gunt valley, and figure 6 is a cross-section of the divide Leading into (dinar v Stock Photo

RMRGFFGT–. Bulletin of the Geological Society of America. Geology; Geology -- United States. .", 1 c. i». WALCOTT—A DISPLACEMENT IN" THE GRAND CANON. fiuiIt continues several miles, the strata n the thrown Bide sometimes ap- proaching the fault almosl horizontally, but usually bending somewhat abruptly upward. They often stand vertically, and arc bo metamorphosed, flattened out, or compressed, that little of the original appearance of the ruck remains. Figure 5 represents a cross-section of the ridge south of Kwa-gunt valley, and figure 6 is a cross-section of the divide Leading into (dinar v

. Bulletin of the Geological Society of America. Geology; Geology -- United States. zoooo' 30000'. •Sooc 10000' iSooo S.E Pinole PA.. SECTION DD , Proba-bte. po JtyLt/JIf. Fork Yuba.Rit.itr /ln(ie.iL and Al&ece.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF1T–. Bulletin of the Geological Society of America. Geology; Geology -- United States. zoooo' 30000'. •Sooc 10000' iSooo S.E Pinole PA.. SECTION DD , Proba-bte. po JtyLt/JIf. Fork Yuba.Rit.itr /ln(ie.iL and Al&ece.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 4.—Cnimpliiifi af Itcrkniantoini Limrstone in nhl Qvarry ut YalcvUle. Figure 5.—Inverted Buckle crossing Raquette River helow Bridge at Norfolk in ligure 7. The close plications of the latter seem explicable only in terms of a lateral compression, involving necessarily the underlying crys- tallines. A slight pinching of the pre-Cambrian syncline is all that is required, as illustrated in the diagrams (figures 8 and 9).. Please note that these images are extracted from scanned page images that may have be Stock Photo

RMRGFEPX–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 4.—Cnimpliiifi af Itcrkniantoini Limrstone in nhl Qvarry ut YalcvUle. Figure 5.—Inverted Buckle crossing Raquette River helow Bridge at Norfolk in ligure 7. The close plications of the latter seem explicable only in terms of a lateral compression, involving necessarily the underlying crys- tallines. A slight pinching of the pre-Cambrian syncline is all that is required, as illustrated in the diagrams (figures 8 and 9).. Please note that these images are extracted from scanned page images that may have be

. Bulletin of the Geological Society of America. Geology; Geology -- United States. ^05O.C. (a) U.T. R.W Fir.uRF. 3.—An East and West Section on the & : ' V ip Brook. Tlie section faces north fit a point opposite section 1 and south of the outcrop of lava besides the brook. L.A. = Lower Aubrey sandstone. Other letters and scale as in section 1. out breaking, and the fault is limited to the pre-Cambrian movement that displaced the Chuar and Grand Canon terranes of the Algonkian. The latter movement is shown by the faults b and c, fig. 2. Whether a pre- (iambrian fault existed on the line of Stock Photo

RMRGFFH4–. Bulletin of the Geological Society of America. Geology; Geology -- United States. ^05O.C. (a) U.T. R.W Fir.uRF. 3.—An East and West Section on the & : ' V ip Brook. Tlie section faces north fit a point opposite section 1 and south of the outcrop of lava besides the brook. L.A. = Lower Aubrey sandstone. Other letters and scale as in section 1. out breaking, and the fault is limited to the pre-Cambrian movement that displaced the Chuar and Grand Canon terranes of the Algonkian. The latter movement is shown by the faults b and c, fig. 2. Whether a pre- (iambrian fault existed on the line of

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914. PL. 8. FiGUKE 1.—West Wall of Bi;ooklyn Ciia.vxel 'I'he view is on the north side of the cut. On the right is sandstone at the track level.. On the left is Bedford shale, reaching 10 feet above the track level. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] Stock Photo

RMRGFEXF–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914. PL. 8. FiGUKE 1.—West Wall of Bi;ooklyn Ciia.vxel 'I'he view is on the north side of the cut. On the right is sandstone at the track level.. On the left is Bedford shale, reaching 10 feet above the track level. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ]

. Bulletin of the Geological Society of America. Geology; Geology -- United States. INCONSTANT STRATIGRAPHY AT SANI>('< H'LEE. 315 Diamond Drill Records <ii Sandcoidte.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF07–. Bulletin of the Geological Society of America. Geology; Geology -- United States. INCONSTANT STRATIGRAPHY AT SANI>('< H'LEE. 315 Diamond Drill Records <ii Sandcoidte.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.. Figure 2. SECONDARY ENLARGEMENT OF CLASTIC TOURMALINE.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF63–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.. Figure 2. SECONDARY ENLARGEMENT OF CLASTIC TOURMALINE.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 1. (W^ lJu/(Uuu^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEYY–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 1. (W^ lJu/(Uuu^. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. iSic&rd Tinxb. 100' **K^ ^fi/voonty 113' Wa.Uup£7F**Littyor}( aZndian.4 H. I bo 'firiest) I Iowa Hill. (nearly level) aWiscons. H. Atyf/s '9 fan'kee.Oimj /* sf^Dg rJa ntlUt.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF2B–. Bulletin of the Geological Society of America. Geology; Geology -- United States. iSic&rd Tinxb. 100' **K^ ^fi/voonty 113' Wa.Uup£7F**Littyor}( aZndian.4 H. I bo 'firiest) I Iowa Hill. (nearly level) aWiscons. H. Atyf/s '9 fan'kee.Oimj /* sf^Dg rJa ntlUt.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 478 J. H. GARDNER—STRATIGRAPHIC DISTURBANCE IN OHIO VALLEY. to s s D CJ. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEMG–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 478 J. H. GARDNER—STRATIGRAPHIC DISTURBANCE IN OHIO VALLEY. to s s D CJ. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. â * i-i o >. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEX2–. Bulletin of the Geological Society of America. Geology; Geology -- United States. â * i-i o >. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. THE DON BEDS 245 away, and not from the Keewatin center, 1,400 miles away, as suggested by Professor Wright. The lowest boulder-clay in most parts of the Don A'alley rests on the Lorraine shale, with a thickness of 3 or i feet; but at one point, near the bend of the Don, both the boulder-clay and the shale beneath were cut away by a small intergiacial river to the depth of 16 feet, over a breadth of 400 feet. The cutting into the shale, with its resistant layers of thin limestone, was as deep as that made by th Stock Photo

RMRGFEWH–. Bulletin of the Geological Society of America. Geology; Geology -- United States. THE DON BEDS 245 away, and not from the Keewatin center, 1,400 miles away, as suggested by Professor Wright. The lowest boulder-clay in most parts of the Don A'alley rests on the Lorraine shale, with a thickness of 3 or i feet; but at one point, near the bend of the Don, both the boulder-clay and the shale beneath were cut away by a small intergiacial river to the depth of 16 feet, over a breadth of 400 feet. The cutting into the shale, with its resistant layers of thin limestone, was as deep as that made by th

. Bulletin of the Geological Society of America. Geology; Geology -- United States. â ^:r 'K^ ^ MORPHOLOGY OF THE TBEPOSTOMATA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFENJ–. Bulletin of the Geological Society of America. Geology; Geology -- United States. â ^:r 'K^ ^ MORPHOLOGY OF THE TBEPOSTOMATA. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 314 W. II. WEEDâTWO MONTANA COAL FIELDS. The following section represents the strata exposed on McGriffin coulee, a branch of Sand coulee, near the coal mines: 25 Laminated hard brown sandstone. 6 Massive coarse mottled sandstone. 2 Fine grained white massive sandstone. io Fine grained brown massive sandstone. id Shales, dark red, holding nodules.. Calcareous conglomerate. Red shales, holding*arenaceous limestone nodules. Sandstone, massive, fine grained, white. Limestones, very arenaceous, light purple or red Stock Photo

RMRGFF0A–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 314 W. II. WEEDâTWO MONTANA COAL FIELDS. The following section represents the strata exposed on McGriffin coulee, a branch of Sand coulee, near the coal mines: 25 Laminated hard brown sandstone. 6 Massive coarse mottled sandstone. 2 Fine grained white massive sandstone. io Fine grained brown massive sandstone. id Shales, dark red, holding nodules.. Calcareous conglomerate. Red shales, holding*arenaceous limestone nodules. Sandstone, massive, fine grained, white. Limestones, very arenaceous, light purple or red

. Bulletin of the Geological Society of America. Geology; Geology -- United States. o a o O I? U h) O P4 <! Ph M <J Hi o a -a o a as be s o re c c o n H. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEN0–. Bulletin of the Geological Society of America. Geology; Geology -- United States. o a o O I? U h) O P4 <! Ph M <J Hi o a -a o a as be s o re c c o n H. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL.26, 1914, PL. 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEMJ–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL.26, 1914, PL. 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 1. 1889. BULL. GEOL. SOG. AM. !. FlG. 1.— MODtRN BOULDER PAVEMENT ON GEORGIAN BAY EAST OF THE END OF BLUE MOUNTAINS OF COLLINGWOOD, ONT.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFFFG–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 1. 1889. BULL. GEOL. SOG. AM. !. FlG. 1.— MODtRN BOULDER PAVEMENT ON GEORGIAN BAY EAST OF THE END OF BLUE MOUNTAINS OF COLLINGWOOD, ONT.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BTILL GEOL. SOC VOL 3, 1891 PL 8. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF1P–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BTILL GEOL. SOC VOL 3, 1891 PL 8. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. M ^ o ^ 2 c .S t: o -o u ;^ ^ rt â o 9 O o rt *^ a T Â£ Â» 7^ â J '^ s Xi 1 V. a. I y. c; Tt 0/ o !i^ S - 0 ^ O CT X ^ Â» â " ^ M " Z S â /' o ;;. (H O CO Q n W 0 a &; F4 0) P4 c -< o 'w ^ 'w o a- ?^ â x.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEWX–. Bulletin of the Geological Society of America. Geology; Geology -- United States. M ^ o ^ 2 c .S t: o -o u ;^ ^ rt â o 9 O o rt *^ a T Â£ Â» 7^ â J '^ s Xi 1 V. a. I y. c; Tt 0/ o !i^ S - 0 ^ O CT X ^ Â» â " ^ M " Z S â /' o ;;. (H O CO Q n W 0 a &; F4 0) P4 c -< o 'w ^ 'w o a- ?^ â x.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 56 G. F. BECKER FINITE STRAIN IN ROCKS. strain ellipsoid, or the direction of maximum compression, will lie between the line of pressure and the compressive axis of the additional shear. When the rock is ruptured without sensible deformation the strain under discussion will not be rotational and will be indistinguishable from that which would result from a simple shear; for in the xy plane one of the shears arising from direct pressure cooperates with the shear resulting from the preliminary rotation, and their Stock Photo

RMRGFFDN–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 56 G. F. BECKER FINITE STRAIN IN ROCKS. strain ellipsoid, or the direction of maximum compression, will lie between the line of pressure and the compressive axis of the additional shear. When the rock is ruptured without sensible deformation the strain under discussion will not be rotational and will be indistinguishable from that which would result from a simple shear; for in the xy plane one of the shears arising from direct pressure cooperates with the shear resulting from the preliminary rotation, and their

. Bulletin of the Geological Society of America. Geology; Geology -- United States. USUI w^Bis ^dÂ£^Â». CaBSsl'S i i-Y â¢ :"&;â¢& ;' Â» â :' % " wk mmm W 2 X >H Mil / "Fwm 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF52–. Bulletin of the Geological Society of America. Geology; Geology -- United States. USUI w^Bis ^dÂ£^Â». CaBSsl'S i i-Y â¢ :"&;â¢& ;' Â» â :' % " wk mmm W 2 X >H Mil / "Fwm 11. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. ,7.10 J. S. DILLER—GEOLOGY OF THE TAYLORVILLE REGION. Grizzly Anticlinal.—The existence of the Grizzly anticlinal is not so clearly defined as that of the Genesee, for its determination depends upon the presence of one fossiliferous stratum, viz, the Montgomery lime- stone (Silurian). The strata immediately adjoining this limestone on both sides are in general much more ancient looking than those coming next in order, and if we proceed far enough across the strike in either direction from the Silurian the first Stock Photo

RMRGFET6–. Bulletin of the Geological Society of America. Geology; Geology -- United States. ,7.10 J. S. DILLER—GEOLOGY OF THE TAYLORVILLE REGION. Grizzly Anticlinal.—The existence of the Grizzly anticlinal is not so clearly defined as that of the Genesee, for its determination depends upon the presence of one fossiliferous stratum, viz, the Montgomery lime- stone (Silurian). The strata immediately adjoining this limestone on both sides are in general much more ancient looking than those coming next in order, and if we proceed far enough across the strike in either direction from the Silurian the first

. Bulletin of the Geological Society of America. Geology; Geology -- United States. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF9C–. Bulletin of the Geological Society of America. Geology; Geology -- United States. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 26. "l>;i l;i: 1. -('ukiim.an S.wds f.i: I! i ijisini: riKjiogiapli l).v (' L. I'akiT. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEMM–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 26. "l>;i l;i: 1. -('ukiim.an S.wds f.i: I! i ijisini: riKjiogiapli l).v (' L. I'akiT. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. ..' . ,: â¢ â â â¢â â â /HIIHIIWII |l|l lll||'Â«.lll|IM'Â»-llirÂ»Â»|FÂ»..- I ^g^'H' '.'â ii" Â»>mi - , '."f*>"j*"p ;i' r-r â '"â¢' 'â â 'â "'iH.Uul'.,-:"'.:-:."ii'SitZlil'-ti'M 1. NEW T/E. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF7N–. Bulletin of the Geological Society of America. Geology; Geology -- United States. ..' . ,: â¢ â â â¢â â â /HIIHIIWII |l|l lll||'Â«.lll|IM'Â»-llirÂ»Â»|FÂ»..- I ^g^'H' '.'â ii" Â»>mi - , '."f*>"j*"p ;i' r-r â '"â¢' 'â â 'â "'iH.Uul'.,-:"'.:-:."ii'SitZlil'-ti'M 1. NEW T/E. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC AM. VOL. 1, 1389, PL. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF5F–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC AM. VOL. 1, 1389, PL. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. if - - â , â yj.. â , .Y.I .â :'p^ â .- - â --l&aSk â¢. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFFEW–. Bulletin of the Geological Society of America. Geology; Geology -- United States. if - - â , â yj.. â , .Y.I .â :'p^ â .- - â --l&aSk â¢. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC AM 1891 PL !I HaWC '**TI«" '••"-'. v. *—, >s V**-' "^ &!*£. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEX7–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC AM 1891 PL !I HaWC '**TI«" '••"-'. v. *—, >s V**-' "^ &!*£. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. T. X. DALEâTHE STOCKBRIDGE LIMESTONE. >1 t In section (', about three-quarters of a mile farther norl hi ward, the quartzite over- lies the schist.* In section D, south of .1 and about half a mile south of the deepest part of the saddle, a block of the schist which belongs over the limestone is wedged in between quartzite masses. The structure is like that in section .1. but occurs higher up the hill where the schists have escaped erosion. Section E is longitudinal, from the deepest part of the saddle northw Stock Photo

RMRGFEPN–. Bulletin of the Geological Society of America. Geology; Geology -- United States. T. X. DALEâTHE STOCKBRIDGE LIMESTONE. >1 t In section (', about three-quarters of a mile farther norl hi ward, the quartzite over- lies the schist.* In section D, south of .1 and about half a mile south of the deepest part of the saddle, a block of the schist which belongs over the limestone is wedged in between quartzite masses. The structure is like that in section .1. but occurs higher up the hill where the schists have escaped erosion. Section E is longitudinal, from the deepest part of the saddle northw

. Bulletin of the Geological Society of America. Geology; Geology -- United States. SPHERULITES AND LITHOPHYS^E 267 0.5 mm. in diameter. The supporting needles rarely measure over 0.03 mm. in thickness (see figure 3). Their optical properties, so far as could be determined, are: y about 1.535, a about 1.530; birefringence weak: ex- tinction oblique with c:y' from 0° to 28°; elongation is usually y', but occasionally a. The plane of optic axes is apparently normal to the elongation. Some of the needles have the appearance, between crossed nicols, of 23ossessing exceedingly fine polysynthetic tw Stock Photo

RMRGFETD–. Bulletin of the Geological Society of America. Geology; Geology -- United States. SPHERULITES AND LITHOPHYS^E 267 0.5 mm. in diameter. The supporting needles rarely measure over 0.03 mm. in thickness (see figure 3). Their optical properties, so far as could be determined, are: y about 1.535, a about 1.530; birefringence weak: ex- tinction oblique with c:y' from 0° to 28°; elongation is usually y', but occasionally a. The plane of optic axes is apparently normal to the elongation. Some of the needles have the appearance, between crossed nicols, of 23ossessing exceedingly fine polysynthetic tw

. Bulletin of the Geological Society of America. Geology; Geology -- United States. STKATIGFvAPHY OF THK DIKE REGION. 431 The Cretaceous group of strata appears to be a continuous, conformable series, thousands of feet in thickness. The basal bed, well exposed on Eagle, Byron, and Jerusalem creeks, is a heavy conglomerate of coarse, round and sub-angular fragments derived directly from the older metamorphic rocks, upon which it rests unconformably, and marks approximately an ancient shore line of Cretaceous time. The strata of the lower portion of the group lyiug on the North fork of Cottonwoo Stock Photo

RMRGFF7C–. Bulletin of the Geological Society of America. Geology; Geology -- United States. STKATIGFvAPHY OF THK DIKE REGION. 431 The Cretaceous group of strata appears to be a continuous, conformable series, thousands of feet in thickness. The basal bed, well exposed on Eagle, Byron, and Jerusalem creeks, is a heavy conglomerate of coarse, round and sub-angular fragments derived directly from the older metamorphic rocks, upon which it rests unconformably, and marks approximately an ancient shore line of Cretaceous time. The strata of the lower portion of the group lyiug on the North fork of Cottonwoo

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC. AM ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF81–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL SOC. AM ;. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—Cavern cut Across by GLACi.iL Erosion Greatest wiJth about IS inches. Note sharp angle between glaciated and unglaciated surfaces even where cavern extends parallel to the stria;. oj9'- X V ProDRE 2.—An Enlarged joint Cavern Upper foot smoothed and striated by ice : proof of pre-Glacial age of solution effects. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly Stock Photo

RMRGFEXR–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—Cavern cut Across by GLACi.iL Erosion Greatest wiJth about IS inches. Note sharp angle between glaciated and unglaciated surfaces even where cavern extends parallel to the stria;. oj9'- X V ProDRE 2.—An Enlarged joint Cavern Upper foot smoothed and striated by ice : proof of pre-Glacial age of solution effects. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly

. Bulletin of the Geological Society of America. Geology; Geology -- United States. SURFACE GRAVELS AND SANDS. 85 which is occupying the position as in front of a beach. The ridges may be replaced by cones, resembling delta deposits. The ridges are often scarcely less direct and scarcely more broken or more varying in height than beaches, especially when the subsequent erosion and unequal elevation, caused by terrestrial movements since the gravels were deposited, is taken into account. The ridges are often found to divide and enclose kettle-like depressions, sometimes dry and sometimes contai Stock Photo

RMRGFFFC–. Bulletin of the Geological Society of America. Geology; Geology -- United States. SURFACE GRAVELS AND SANDS. 85 which is occupying the position as in front of a beach. The ridges may be replaced by cones, resembling delta deposits. The ridges are often scarcely less direct and scarcely more broken or more varying in height than beaches, especially when the subsequent erosion and unequal elevation, caused by terrestrial movements since the gravels were deposited, is taken into account. The ridges are often found to divide and enclose kettle-like depressions, sometimes dry and sometimes contai

. Bulletin of the Geological Society of America. Geology; Geology -- United States. FIG 2—GREAT SANDSTONE DIKE ON ROA RIVER 5 FEET THICK.. FIG. 3. —GROUP OF SANDSTONE DIKES ON NORTH FORK THE LARGEST 4 INCHES THICK. FIG 4—LATERAL VIEW OF SANDSTONE Dl ON DRY CREEK.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF90–. Bulletin of the Geological Society of America. Geology; Geology -- United States. FIG 2—GREAT SANDSTONE DIKE ON ROA RIVER 5 FEET THICK.. FIG. 3. —GROUP OF SANDSTONE DIKES ON NORTH FORK THE LARGEST 4 INCHES THICK. FIG 4—LATERAL VIEW OF SANDSTONE Dl ON DRY CREEK.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF6T–. Bulletin of the Geological Society of America. Geology; Geology -- United States. i. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

RMRGFEY5–. Bulletin of the Geological Society of America. Geology; Geology -- United States. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 250 A. p. COLEMAN THE EARLIEST INTER-GLACIAL PERIOD. INTERGLACIAL B£.D3 IN ONTAf^/O Scale, /oo mi Iks Figure 2.—MaiJ shoicing interglacial lieds in Ontario. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFETT–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 250 A. p. COLEMAN THE EARLIEST INTER-GLACIAL PERIOD. INTERGLACIAL B£.D3 IN ONTAf^/O Scale, /oo mi Iks Figure 2.—MaiJ shoicing interglacial lieds in Ontario. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. ;;-jo W. II. WEED TWO MONTANA COAL FIELDS. The coking coal is separated in mining and sold separately for Mack- smiths' use. The second parting is not separated. Examinations of the coal bed, made at the various openings of the Belt basin and other parts of the Great Falls field, show the following- sections : Sections of Coal Seams of the Great Falls Field, Montana. (lastner mine. Millard mine. Watson mine. Arming- ton mine. Sand Entry. Room. Coulee. Sandrock Slate 9" Coal 28" Slate 5" 20" Stock Photo

RMRGFEYM–. Bulletin of the Geological Society of America. Geology; Geology -- United States. ;;-jo W. II. WEED TWO MONTANA COAL FIELDS. The coking coal is separated in mining and sold separately for Mack- smiths' use. The second parting is not separated. Examinations of the coal bed, made at the various openings of the Belt basin and other parts of the Great Falls field, show the following- sections : Sections of Coal Seams of the Great Falls Field, Montana. (lastner mine. Millard mine. Watson mine. Arming- ton mine. Sand Entry. Room. Coulee. Sandrock Slate 9" Coal 28" Slate 5" 20"

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—Portion of Clerelaml Quadrangle, showing Location of Brooklyn Channel below the level of the road-bed, hence unexposed. The walls of the chan- nel are of red Bedford shale. The east wall is steep, the inclination being about 35 degrees, with the Bedford shale rising rapidly above the base of the cut until it attains a height of 30 feet above the level of the. O FEET FiciUKE 2.—Section of the Belt Line Railroad Cut This cut Is across the Brooklyn Channel of Berea sandstone cut hi Bedford shale road-bed Stock Photo

RMRGFEX6–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—Portion of Clerelaml Quadrangle, showing Location of Brooklyn Channel below the level of the road-bed, hence unexposed. The walls of the chan- nel are of red Bedford shale. The east wall is steep, the inclination being about 35 degrees, with the Bedford shale rising rapidly above the base of the cut until it attains a height of 30 feet above the level of the. O FEET FiciUKE 2.—Section of the Belt Line Railroad Cut This cut Is across the Brooklyn Channel of Berea sandstone cut hi Bedford shale road-bed

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Mt.Lola. Zoooo Volcanic Riicji.ss flows tipping Ea.sltva.-ri. 2SOO0 390*0 .7000'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF1E–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Mt.Lola. Zoooo Volcanic Riicji.ss flows tipping Ea.sltva.-ri. 2SOO0 390*0 .7000'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. ClTea t square Fool. "Plicated Quart* veins and cleavage FoliaCton uxnUiscavite-BiotiXc- 6nfciv5 near Hof>Kiu% QuanTY, Great.Barri.nqG)n 1na>-cK imp ' B3te Figure 'â '>.âCleavagt ami Bi'lnimj near Great Barrington (after Dale). The Hopkins-Searles quarry lies very near the line separating the portions of territory allotted to Mr. Dale and myself fur study. Ignorant of the fact that he had examined the locality, I visited it in July, 1890, and arrived at the same con- clusions concerning the genera Stock Photo

RMRGFER3–. Bulletin of the Geological Society of America. Geology; Geology -- United States. ClTea t square Fool. "Plicated Quart* veins and cleavage FoliaCton uxnUiscavite-BiotiXc- 6nfciv5 near Hof>Kiu% QuanTY, Great.Barri.nqG)n 1na>-cK imp ' B3te Figure 'â '>.âCleavagt ami Bi'lnimj near Great Barrington (after Dale). The Hopkins-Searles quarry lies very near the line separating the portions of territory allotted to Mr. Dale and myself fur study. Ignorant of the fact that he had examined the locality, I visited it in July, 1890, and arrived at the same con- clusions concerning the genera

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 30G W. II. WELD TWO MONTANA COAL FIELDS. ^6 2t. Figure 2.—Section at Belt Butte. 22 21 20. a 19. 18 Belt Butte Section. Feet. 20. Sandstone, gray, slaty and hard, forming cap of the butte ' 80 25. Slate, black 20 24. Limestone, white ami hard ; forms upper " belt "... 20 23. Sandstone, gray, irregularly bedded, breaks into shelly detritus 90 Shale, black and earthy 100 Sandstone, unevenly and thinly bedded, usually light earthy brown, holding carbonaceous Layers of 1 to 3 inches ; principal " bel Stock Photo

RMRGFF0G–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 30G W. II. WELD TWO MONTANA COAL FIELDS. ^6 2t. Figure 2.—Section at Belt Butte. 22 21 20. a 19. 18 Belt Butte Section. Feet. 20. Sandstone, gray, slaty and hard, forming cap of the butte ' 80 25. Slate, black 20 24. Limestone, white ami hard ; forms upper " belt "... 20 23. Sandstone, gray, irregularly bedded, breaks into shelly detritus 90 Shale, black and earthy 100 Sandstone, unevenly and thinly bedded, usually light earthy brown, holding carbonaceous Layers of 1 to 3 inches ; principal " bel

. Bulletin of the Geological Society of America. Geology; Geology -- United States. w 9***'r Vt(canic Kid^tt, flows sla/n Vrh Tic Jtoct l,. no Wtiit^ari SECTION N.W. SECTION ". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF25–. Bulletin of the Geological Society of America. Geology; Geology -- United States. w 9***'r Vt(canic Kid^tt, flows sla/n Vrh Tic Jtoct l,. no Wtiit^ari SECTION N.W. SECTION ". Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. PLASTIC SOLIDS. 47 however, that because S is very small, n is also small. The rigidity of a mass seems quite independent of its elastic limit. Tims wrought iron and cast steel have nearly the same modulus of rigidity, though the elastic limit is very different for the two substances. A material, then, may have a very low elastic limit and yet oppose great resistance to de- formation within that limit. If the rigidity of a mass is great, the lines of maximum tangential strain under pressure will make angles of Stock Photo

RMRGFFDW–. Bulletin of the Geological Society of America. Geology; Geology -- United States. PLASTIC SOLIDS. 47 however, that because S is very small, n is also small. The rigidity of a mass seems quite independent of its elastic limit. Tims wrought iron and cast steel have nearly the same modulus of rigidity, though the elastic limit is very different for the two substances. A material, then, may have a very low elastic limit and yet oppose great resistance to de- formation within that limit. If the rigidity of a mass is great, the lines of maximum tangential strain under pressure will make angles of

. Bulletin of the Geological Society of America. Geology; Geology -- United States. tA h O > o o o hi. J; 3 o - ?J ^ i <j .= o ^ <A 3 w - 2 J % I H 1 E-l ^ W C o -^ id 5J. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFENA–. Bulletin of the Geological Society of America. Geology; Geology -- United States. tA h O > o o o hi. J; 3 o - ?J ^ i <j .= o ^ <A 3 w - 2 J % I H 1 E-l ^ W C o -^ id 5J. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. 7000' &w 6S0O 7S00',-r--i ..- 6000' JOOO' ^SS-oo' 6soo' - 4So00' t>Â°o' lfS00' â ysoo'u Woo' Sood 20000" SECTION FF N.E. Cisco Butte. 2000'MofSetiim puiaL 6soo'- â-i&oo^ SBeo1 1 50-Q.& So 00'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF0X–. Bulletin of the Geological Society of America. Geology; Geology -- United States. 7000' &w 6S0O 7S00',-r--i ..- 6000' JOOO' ^SS-oo' 6soo' - 4So00' t>Â°o' lfS00' â ysoo'u Woo' Sood 20000" SECTION FF N.E. Cisco Butte. 2000'MofSetiim puiaL 6soo'- â-i&oo^ SBeo1 1 50-Q.& So 00'. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFEY8–. Bulletin of the Geological Society of America. Geology; Geology -- United States. BULL. GEOL. SOC. AM. VOL. 26, 1914, PL. 5. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—East and West Section at the loiver end of Nun-ko-weap Valley on the North side of the Brook. R. W. = Red Wall limestone (Carboniferous); U. T. = Upper Tonto (Upper Cambrian); T. Sd.= Tonto sandstones (Middle Cambrian?); C=Shales of the Chuar group (Algonkian) ; G. C. = Shaly sandstones of the Grand Canon group (Algonkian) that belong below the lava beds L; a, a = Butte fault; 6, b and c, c = Pre-Cambrian faults. Vertical scale, 1000 feet = 1 inch. West. East. T. Sd. C. (c) li. (b) G.C. Figure 2.—Sect Stock Photo

RMRGFFHA–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure 1.—East and West Section at the loiver end of Nun-ko-weap Valley on the North side of the Brook. R. W. = Red Wall limestone (Carboniferous); U. T. = Upper Tonto (Upper Cambrian); T. Sd.= Tonto sandstones (Middle Cambrian?); C=Shales of the Chuar group (Algonkian) ; G. C. = Shaly sandstones of the Grand Canon group (Algonkian) that belong below the lava beds L; a, a = Butte fault; 6, b and c, c = Pre-Cambrian faults. Vertical scale, 1000 feet = 1 inch. West. East. T. Sd. C. (c) li. (b) G.C. Figure 2.—Sect

. Bulletin of the Geological Society of America. Geology; Geology -- United States. DRAINED BY THE TISBURY RIVER ($ Mi W. of N. Tisbury P 0) MARTHAS mTEYARD. •/BIN. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society Stock Photo

RMRGFF6B–. Bulletin of the Geological Society of America. Geology; Geology -- United States. DRAINED BY THE TISBURY RIVER ($ Mi W. of N. Tisbury P 0) MARTHAS mTEYARD. •/BIN. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure I.—Microscopic Crystal of Epidote in Ellicott City (Maryland Granite. Fi<.i be 2.—Epidote in Ellicott City Granite. An interesting occurrence of epidote is as an inclusion in sphene, along with an apatite and a greenish mineral having all the optical and physical characters of pleonaste. In other masses the sharply bounded. Figube 3.— Epidote in Woodstock (Maryland) Granite.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co Stock Photo

RMRGFF08–. Bulletin of the Geological Society of America. Geology; Geology -- United States. Figure I.—Microscopic Crystal of Epidote in Ellicott City (Maryland Granite. Fi<.i be 2.—Epidote in Ellicott City Granite. An interesting occurrence of epidote is as an inclusion in sphene, along with an apatite and a greenish mineral having all the optical and physical characters of pleonaste. In other masses the sharply bounded. Figube 3.— Epidote in Woodstock (Maryland) Granite.. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - co

RMRGFF8K–. Bulletin of the Geological Society of America. Geology; Geology -- United States. . Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original work.. Geological Society of America. [New York, etc. ] The Society

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