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A large outcrop of felsite at Beorgs of Uyea, Shetland, Scotland, UK, was quarried, roofed over & used to produce Neolithic polished knives & axes. Stock Photo

RM2KANBHY–A large outcrop of felsite at Beorgs of Uyea, Shetland, Scotland, UK, was quarried, roofed over & used to produce Neolithic polished knives & axes.

'The Felsite Unit' or green meta rhyolite. Green layering on the rock is a mica called fuchsite and is part of the gold system Stock Photo

RMDH6KM3–'The Felsite Unit' or green meta rhyolite. Green layering on the rock is a mica called fuchsite and is part of the gold system

A drystone wall composed of Felsite rocks on Tinto Hill near Biggar in the Southern Uplands of Scotland, UK. Stock Photo

RME3Y5TA–A drystone wall composed of Felsite rocks on Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

Apollo 14 Moon Rock with Felsite Clast Stock Photo

RMT8X948–Apollo 14 Moon Rock with Felsite Clast

RM2BF4368–Felsite. 13 Mar 20191

Rock Felsite porphyry Pyroxene thin section showing minerals through cross polarized light Stock Photo

RMAX13CF–Rock Felsite porphyry Pyroxene thin section showing minerals through cross polarized light

Felsite. 26 Oct 201749441931 Stock Photo

RM2BF1WBJ–Felsite. 26 Oct 201749441931

RFW3TE80–Felsite, Igneous Rocks.

Glacier below Felsite Peak in Kluane National Park, Yukon, Canada Stock Photo

RFWW4BA8–Glacier below Felsite Peak in Kluane National Park, Yukon, Canada

Yerevan, Armenia,January 02,2019: Beginning of Amiryan Street with old buildings that continue the style of the architectural ensemble of the central Stock Photo

RFRX1NKT–Yerevan, Armenia,January 02,2019: Beginning of Amiryan Street with old buildings that continue the style of the architectural ensemble of the central

The Quarterly journal of the Geological Society of London . d account for the formation of such pyromerides asthose of Jersey. He thought that the characters of the ObsidianCliff lithophyses could be best explained by the alteration of spheru-lites through their inclusion in a lava of later date than their originalformation ; and he noted the coincidence of the occurrence ofbrecciated obsidian in association with the lithophyses in the onecase, and of brecciated felsite in association with the pyromerides ofJersey. He congratulated the Author on this interesting contri-bution to the literature Stock Photo

RM2AWK0RF–The Quarterly journal of the Geological Society of London . d account for the formation of such pyromerides asthose of Jersey. He thought that the characters of the ObsidianCliff lithophyses could be best explained by the alteration of spheru-lites through their inclusion in a lava of later date than their originalformation ; and he noted the coincidence of the occurrence ofbrecciated obsidian in association with the lithophyses in the onecase, and of brecciated felsite in association with the pyromerides ofJersey. He congratulated the Author on this interesting contri-bution to the literature

. A treatise on rocks, rock-weathering and soils;. Petrology; Soils. Fig. 1. Chert breccia cemented by zinc blende. Fig. 2. Felsite breccia formed of felsitic fragments embedded in a matrix of the same composition.. 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.. Merrill, George P[erkins] 1854-. New York, London, The Macmillan company Stock Photo

RMPFTPPD–. A treatise on rocks, rock-weathering and soils;. Petrology; Soils. Fig. 1. Chert breccia cemented by zinc blende. Fig. 2. Felsite breccia formed of felsitic fragments embedded in a matrix of the same composition.. 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.. Merrill, George P[erkins] 1854-. New York, London, The Macmillan company

patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland. Stock Photo

RF2EY87TK–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

Surb Astvatsatsin church at Odzun monastery in Armenia Stock Photo

RMGG6H1Y–Surb Astvatsatsin church at Odzun monastery in Armenia

Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old Stock Photo

RMC34DYE–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Arched central entrance at monastery Odzun with bivalve wooden the entrance door covered carved patterns Stock Photo

RFKJPWK6–Arched central entrance at monastery Odzun with bivalve wooden the entrance door covered carved patterns

Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 52 DISCOVERY REPORTS tuff made up of angular fragments of the fluxional rock, a biotite-rhyolite, and orthoclase-porphyry or felsite with only sparse phenocrystic quartz. Finally, a fragment collected from the scree on the cliffs of a rocky islet near the anchorage turns out to be a crushed sericitic quartzite of a distinctly ancient aspect. DECEPTION ISLAND Deception Island is the best known of the South Shetland Islands. Dr Thomas ((2), p. 81) has commented on the earlier literature of the island. Mr Ferguson adde Stock Photo

RMT1GP9A–Discovery reports (1947) Discovery reports discoveryreports23inst Year: 1947 52 DISCOVERY REPORTS tuff made up of angular fragments of the fluxional rock, a biotite-rhyolite, and orthoclase-porphyry or felsite with only sparse phenocrystic quartz. Finally, a fragment collected from the scree on the cliffs of a rocky islet near the anchorage turns out to be a crushed sericitic quartzite of a distinctly ancient aspect. DECEPTION ISLAND Deception Island is the best known of the South Shetland Islands. Dr Thomas ((2), p. 81) has commented on the earlier literature of the island. Mr Ferguson adde

Gyumri,Armenia,05 September,2019: Entrance to the restaurant is through a double wooden door decorated with carved ornaments and a cornice in a buildi Stock Photo

RF2A8NFTE–Gyumri,Armenia,05 September,2019: Entrance to the restaurant is through a double wooden door decorated with carved ornaments and a cornice in a buildi

Yerevan, Armenia,January 02,2019:View of the former building of the Ministry of Foreign Affairs and the Art gallery on the main square of Yerevan in t Stock Photo

RFRX1NKH–Yerevan, Armenia,January 02,2019:View of the former building of the Ministry of Foreign Affairs and the Art gallery on the main square of Yerevan in t

The Clyde windfarm, one of the largest in Europe, from the summit of Tinto Hill near Biggar in the Southern Uplands Stock Photo

RME0BH9Y–The Clyde windfarm, one of the largest in Europe, from the summit of Tinto Hill near Biggar in the Southern Uplands

RMT81NWK–Apollo 14 Moon Rock with Felsite Clast

Side view of Odzun monastery is one of the most ancient temples of Armenia Stock Photo

RFKJPWJ5–Side view of Odzun monastery is one of the most ancient temples of Armenia

RMT81NTK–Apollo 14 Moon Rock

River flowing below Felsite Peak in Kluane National Park, Yukon, Canada Stock Photo

RFWW4BAW–River flowing below Felsite Peak in Kluane National Park, Yukon, Canada

The annals and magazine of natural history : zoology, botany, and geology . dation of the limestone, but during the pre-valence of the same faunal types as those which characterize thatdeposit, the limestone was broken up by volcanic explosions, and itsfragments, mingled with bits of felsite and other material, weredeposited as the peculiar limestone-breccias. This view regardingtheir formation is held to afford an adequate explanation of thepatchy development of these rocks. The intrusive rocks are of considerable interest. They are, in themain, felsites with large quartz-crystals, and not in Stock Photo

RM2AJ9BPD–The annals and magazine of natural history : zoology, botany, and geology . dation of the limestone, but during the pre-valence of the same faunal types as those which characterize thatdeposit, the limestone was broken up by volcanic explosions, and itsfragments, mingled with bits of felsite and other material, weredeposited as the peculiar limestone-breccias. This view regardingtheir formation is held to afford an adequate explanation of thepatchy development of these rocks. The intrusive rocks are of considerable interest. They are, in themain, felsites with large quartz-crystals, and not in

. The Victoria history of the county of Cumberland. Natural history. HISTORY OF CUMBERLAND. ' ifi llUPPUR O ^ LOWLft OLD RED SANDSTONE ORDOVICIAN L'cdiow ffrovp Wenhick, Tarnnnon, and Birkhill Qr'/itp Conislim LitiwMone Qritui) Milhonm Rocks atul Skiddaw Slates 1 Basalt. Dolerite, atid Qnbhro Andeaiit, Lavas, and Tuffs Diorite Granite and Felsite TLj- EcEmbin^ drogfiijihirn] tnfltii SCALE 4 MILES TO AN INCH THE VICTORIA HISTORY OUHt,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i Stock Photo

RMPFYFP5–. The Victoria history of the county of Cumberland. Natural history. HISTORY OF CUMBERLAND. ' ifi llUPPUR O ^ LOWLft OLD RED SANDSTONE ORDOVICIAN L'cdiow ffrovp Wenhick, Tarnnnon, and Birkhill Qr'/itp Conislim LitiwMone Qritui) Milhonm Rocks atul Skiddaw Slates 1 Basalt. Dolerite, atid Qnbhro Andeaiit, Lavas, and Tuffs Diorite Granite and Felsite TLj- EcEmbin^ drogfiijihirn] tnfltii SCALE 4 MILES TO AN INCH THE VICTORIA HISTORY OUHt,. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these i

RF2EY87FD–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

RMGG6H1N–Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34E15–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

The summit of Tinto Hill near Biggar in the Southern Uplands of Scotland, UK. Stock Photo

RME3Y668–The summit of Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

Part of the arched walls surrounding on three sides, the facade of the monastery Odzun Stock Photo

RFKJPWJH–Part of the arched walls surrounding on three sides, the facade of the monastery Odzun

RMT81NTM–Apollo 14 Moon Rock

Glacier and River below Felsite Peak in Kluane National Park, Yukon, Canada Stock Photo

RFWWRMXK–Glacier and River below Felsite Peak in Kluane National Park, Yukon, Canada

Annual report . irectly from thegreywacke. It is possible that the iron necessary to form such extensive garnet zonesmay have come from the felsite magma, for in places the garnetiferous schist passesgradually into greywacke. Some of the garnetiferous schist may be altered hornblendeschist. Rusty Schist.—The rusty schists, Fig. 44, or pyritous slates, are perhaps the leastextensive of any of the sediments, but they are important economically on account ofthe pyrite deposits being in close association with them. They occur in disconnected belts,rarely exceeding 100 feet in width, and disappear Stock Photo

RM2AN8H3X–Annual report . irectly from thegreywacke. It is possible that the iron necessary to form such extensive garnet zonesmay have come from the felsite magma, for in places the garnetiferous schist passesgradually into greywacke. Some of the garnetiferous schist may be altered hornblendeschist. Rusty Schist.—The rusty schists, Fig. 44, or pyritous slates, are perhaps the leastextensive of any of the sediments, but they are important economically on account ofthe pyrite deposits being in close association with them. They occur in disconnected belts,rarely exceeding 100 feet in width, and disappear

RF2EY874H–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

Eastern and southern facades of Surb Astvatsatsin church at Odzun monastery in Armenia Stock Photo

RMGG6H48–Eastern and southern facades of Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34DJT–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK. Stock Photo

RME3Y6A9–The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

Basalt stone crosses at the corner of the Odzun monastery with a view of the bell tower Stock Photo

RFKJPWHT–Basalt stone crosses at the corner of the Odzun monastery with a view of the bell tower

RMT81NTH–Apollo 14 Moon Rock

The upper corner of the administrative building on the square in Yerevan built of colorful stone, with loggias, columns, arches and beautiful edging o Stock Photo

RFRX1NMC–The upper corner of the administrative building on the square in Yerevan built of colorful stone, with loggias, columns, arches and beautiful edging o

Aerial view of a river flowing below Felsite Peak in Kluane National Park, Yukon, Canada Stock Photo

RFWWRNP8–Aerial view of a river flowing below Felsite Peak in Kluane National Park, Yukon, Canada

Architectural detail of the arched niche framed with carved ornament leaning on the pilaster with the capitals lying on four columns at the facade of Stock Photo

RFRX1NK4–Architectural detail of the arched niche framed with carved ornament leaning on the pilaster with the capitals lying on four columns at the facade of

The Quarterly journal of the Geological Society of London . f the Camp, there remains much groundwhich the present paper leaves untouched. The points from which the different specimens were derived aremarked with some approximation to truth on the accompanyingoutline map, on which the geological boundaries laid down on thepublished Survey map are indicated. The Arabic numerals refer tothe numbers with which the specimens of felsite, derived fromthose spots, were ticketed, while the Roman numerals denote basiceruptive rocks. The numbering of the specimens and sectionsbears no relation to any se Stock Photo

RM2AN4835–The Quarterly journal of the Geological Society of London . f the Camp, there remains much groundwhich the present paper leaves untouched. The points from which the different specimens were derived aremarked with some approximation to truth on the accompanyingoutline map, on which the geological boundaries laid down on thepublished Survey map are indicated. The Arabic numerals refer tothe numbers with which the specimens of felsite, derived fromthose spots, were ticketed, while the Roman numerals denote basiceruptive rocks. The numbering of the specimens and sectionsbears no relation to any se

RF2EY87JR–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

RMGG6H1T–Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34D90–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

RME3Y6EB–The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

RMT81NTG–Apollo 14 Moon Rock

Windows and balconies are deepened into arched niches framed with carved ornaments and resting on two columns on the facade of the administrative buil Stock Photo

RFRX1NJR–Windows and balconies are deepened into arched niches framed with carved ornaments and resting on two columns on the facade of the administrative buil

Transactions . felsite, occurring in this order. In places,by reason of deformation of the granite, gneisses and schistsalso are found. This granitic area occurs north of Johannes-burg, where the width of its outcrop is about 17 miles. It liesbelow, and is coextensive with the Witwatersrand syncline,presently to be described. Probably it forms, as Truscott sug-gests, a complete envelope over the synclines under considera-tion, though in many places it is obscured by later overlyingformations. There are at places intrusions from this envelopinggranitic mass into the younger formations. Immediat Stock Photo

RM2AJAT4F–Transactions . felsite, occurring in this order. In places,by reason of deformation of the granite, gneisses and schistsalso are found. This granitic area occurs north of Johannes-burg, where the width of its outcrop is about 17 miles. It liesbelow, and is coextensive with the Witwatersrand syncline,presently to be described. Probably it forms, as Truscott sug-gests, a complete envelope over the synclines under considera-tion, though in many places it is obscured by later overlyingformations. There are at places intrusions from this envelopinggranitic mass into the younger formations. Immediat

Side view of the monastery Odzun and medieval cemetery with basalt stone crosses Stock Photo

RFKJPWHB–Side view of the monastery Odzun and medieval cemetery with basalt stone crosses

RF2EY877M–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

Arcaded cloister of Surb Astvatsatsin church at Odzun monastery in Armenia Stock Photo

RMGG6H3T–Arcaded cloister of Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34DE0–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Corner of the building of the sanatorium 'Mountain Armenia' with balconies framed by bearing classical columns and top dome veranda in the forest of t Stock Photo

RF2AKDG5R–Corner of the building of the sanatorium 'Mountain Armenia' with balconies framed by bearing classical columns and top dome veranda in the forest of t

Bearing classical columns framing an oval balcony on the corner of the building of the sanatorium 'Mountain Armenia' in the resort of Dilijan Stock Photo

RF2AKDG35–Bearing classical columns framing an oval balcony on the corner of the building of the sanatorium 'Mountain Armenia' in the resort of Dilijan

RFPY7BAG–Side view of Odzun monastery is one of the most ancient temples of Armenia

RME3Y6BC–The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

RMT81NTP–Apollo 14 Moon Rock

Annual report . ts of Ontario are closely associated with the iron ranges,while others are to be found along contacts of igneous rocks with schists or limestones.In this area the pyrites bodies occur along contacts, which are zones of weakness, in therocks of the Grenville series near a felsite intrusion. Of the three groups of sulphide deposits in the Queensboro area, those on theCanadian Sulphur Ore Companys property are at the contact of the rusty schist andquartzite, Fig. 53; those on the Blakely at or near the junction of the intrusive felsiteand garnetiferous schist, while those on the P Stock Photo

RM2AN87Y3–Annual report . ts of Ontario are closely associated with the iron ranges,while others are to be found along contacts of igneous rocks with schists or limestones.In this area the pyrites bodies occur along contacts, which are zones of weakness, in therocks of the Grenville series near a felsite intrusion. Of the three groups of sulphide deposits in the Queensboro area, those on theCanadian Sulphur Ore Companys property are at the contact of the rusty schist andquartzite, Fig. 53; those on the Blakely at or near the junction of the intrusive felsiteand garnetiferous schist, while those on the P

RF2EY87B2–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

RMGG6H1P–Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34E8A–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

The southern side of Odzun monastery with arched gallery and a medieval cemetery at sunset Stock Photo

RFPY7BAK–The southern side of Odzun monastery with arched gallery and a medieval cemetery at sunset

RME3Y6WK–The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

RMT81NTN–Apollo 14 Moon Rock

$Annual report . alents ofthe pre-Cambrian iron formation, jaspilyte, in other areas 19J3 The Pre=Cambrian Geology of Southeastern Ontario 103 The pyrites has been concentrated along fracture zones, produced by the foldingof the schist and by igneous intrusions, which form favorable channels for the percola-tion of the iron and sulphur-bearing solutions. That the felsite and lodes are intimately related is indicated by the fact that theiron pyrites deposits are always not far distant from the felsite. After the pyrites wasdeposited further shearing took place along these lines of weakness which Stock Photo$

RM2AN880A–Annual report . alents ofthe pre-Cambrian iron formation, jaspilyte, in other areas 19J3 The Pre=Cambrian Geology of Southeastern Ontario 103 The pyrites has been concentrated along fracture zones, produced by the foldingof the schist and by igneous intrusions, which form favorable channels for the percola-tion of the iron and sulphur-bearing solutions. That the felsite and lodes are intimately related is indicated by the fact that theiron pyrites deposits are always not far distant from the felsite. After the pyrites wasdeposited further shearing took place along these lines of weakness which

RF2EY87P7–patterned ground on the slopes of Tinto Hill in Lanarkshire, Scotland.

RMGG6H3H–Arcaded cloister of Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34DX5–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Odzun monastery with an arched gallery and bell tower, basalt crosses on the south side at sunset Stock Photo

RFPY7B9X–Odzun monastery with an arched gallery and bell tower, basalt crosses on the south side at sunset

RME3Y643–The Clyde Valley from Tinto Hill near Biggar in the Southern Uplands of Scotland, UK.

Annual report . calcite veinsand fine-grained, pink felsitic dikes cutting the nickel eruptive along the cliffsat the waters edge. These occurrences are found immediately north of the twolarge islands in that part of the lake which is situated on tlie north part of lot 3ill the third concession of Cascaden township. The veins and dikes are as much as5 inches in width. The felsite dikes are older than the calcite veins, since the-latter have been found cutting the former. The calcite veins contain also some-(jiiartz. Possibly if a systematic search were made for these calcite veins some ofthem Stock Photo

RM2AWHXX4–Annual report . calcite veinsand fine-grained, pink felsitic dikes cutting the nickel eruptive along the cliffsat the waters edge. These occurrences are found immediately north of the twolarge islands in that part of the lake which is situated on tlie north part of lot 3ill the third concession of Cascaden township. The veins and dikes are as much as5 inches in width. The felsite dikes are older than the calcite veins, since the-latter have been found cutting the former. The calcite veins contain also some-(jiiartz. Possibly if a systematic search were made for these calcite veins some ofthem

RMGG6H1K–Surb Astvatsatsin church at Odzun monastery in Armenia

RMC34DGD–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Odzun monastery on the south side with views of the arched gallery with the bell tower and stone crosses in the background of forested mountains Stock Photo

RFPY7BAD–Odzun monastery on the south side with views of the arched gallery with the bell tower and stone crosses in the background of forested mountains

RME3Y68H–The Clyde windfarm, one of the largest in Europe, from the summit of Tinto Hill near Biggar in the Southern Uplands

Annual report . garnets have been developed. The fragments vary from microscopic in size tothose which are eighteen inches or more in diameter. The outlines are angular, sub-angular or round, Fig. 30. They consist of felsite or rhyolite, devitrified glass showingflow textures, amygdaloid, fine-grained acid porphyries, quartz, feldspar, crystallinelimestone, slate, fine-grained greywacke or quartzite, and chert; sericite, calcite, garnetand biotite have been developed as secondary minerals. While some of the fragmental material is agglomeratic in character, other partsare more like normal congl Stock Photo

RM2AN8YXM–Annual report . garnets have been developed. The fragments vary from microscopic in size tothose which are eighteen inches or more in diameter. The outlines are angular, sub-angular or round, Fig. 30. They consist of felsite or rhyolite, devitrified glass showingflow textures, amygdaloid, fine-grained acid porphyries, quartz, feldspar, crystallinelimestone, slate, fine-grained greywacke or quartzite, and chert; sericite, calcite, garnetand biotite have been developed as secondary minerals. While some of the fragmental material is agglomeratic in character, other partsare more like normal congl

RMC34E45–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Odzun monastery on the south side at sunset, with views of the arched gallery with the bell tower and basalt crosses in the background of forested mo Stock Photo

RFPY7B9K–Odzun monastery on the south side at sunset, with views of the arched gallery with the bell tower and basalt crosses in the background of forested mo

. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. of great importanceto a municipality. San Diego is especially favored in the extensive area of intrusivefelsite which is now quarried at Spring Valley and Sweetwater Dam,and, if necessary, could be quarried at other points. The gravel fromthe Otay River Valley and from Rose Canyon as well as from otherareas around the Mesa is almost entirely of felsite or some other vol-canic rock of similar qualities. Independent Stone Company, 713 American National Bank Building,Geo. L. Par Stock Photo

RM2AG6YGR–. Appendix to the Journals of the Senate and Assembly of the ... session of the Legislature of the State of California. of great importanceto a municipality. San Diego is especially favored in the extensive area of intrusivefelsite which is now quarried at Spring Valley and Sweetwater Dam,and, if necessary, could be quarried at other points. The gravel fromthe Otay River Valley and from Rose Canyon as well as from otherareas around the Mesa is almost entirely of felsite or some other vol-canic rock of similar qualities. Independent Stone Company, 713 American National Bank Building,Geo. L. Par

RMC34DM0–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

. The geology of the goldfields of British Guiana. f coarse,angular fragments of quartz, intermingled with pebbles of more or lessdecomposed felsite, and, in places, with many nodules of concretionaryironstone—vary in thickness from one to three feet. The gold foundis coarse, and is very unevenly distributed. The Kopang Placers are situated towar*^ the head of the creeknear the Barama distiict. As a rule the overburden of brown clay isnot deep, and the gravel consists of coarse quartz pebbles which do notshow visible gold. The gold obtained is usually fine-grained, and thegravel has yielded at Stock Photo

RM2AG368B–. The geology of the goldfields of British Guiana. f coarse,angular fragments of quartz, intermingled with pebbles of more or lessdecomposed felsite, and, in places, with many nodules of concretionaryironstone—vary in thickness from one to three feet. The gold foundis coarse, and is very unevenly distributed. The Kopang Placers are situated towar*^ the head of the creeknear the Barama distiict. As a rule the overburden of brown clay isnot deep, and the gravel consists of coarse quartz pebbles which do notshow visible gold. The gold obtained is usually fine-grained, and thegravel has yielded at

RMC34DCX–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

RM2AN912N–Annual report . garnets have been developed. The fragments vary from microscopic in size tothose which are eighteen inches or more in diameter. The outlines are angular, sub-angular or round, Fig. 30. They consist of felsite or rhyolite, devitrified glass showingflow textures, amygdaloid, fine-grained acid porphyries, quartz, feldspar, crystallinelimestone, slate, fine-grained greywacke or quartzite, and chert; sericite, calcite, garnetand biotite have been developed as secondary minerals. While some of the fragmental material is agglomeratic in character, other partsare more like normal congl

RMC34DHM–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Annual report . rmally large. The feldspar-porphyry dikeswere cut by small dikes of diabase and trap, and were consequently older than theselatter. Pegmatite Dikes Pegmatite dikes occurred in great profusion in the biotite, and garnetiferousbiotite-gneisses, syenites and granites. These were often very large, consistingalmost entirely of feldspar and a little quartz; chlorite was present in considerablequantities where these dikes intruded the more basic formations. Batholitlis Batholitic intrusions of granite and felsite were seen, Imt were not of commonoccurrence. A considerable area of a ve Stock Photo

RM2AWHDDX–Annual report . rmally large. The feldspar-porphyry dikeswere cut by small dikes of diabase and trap, and were consequently older than theselatter. Pegmatite Dikes Pegmatite dikes occurred in great profusion in the biotite, and garnetiferousbiotite-gneisses, syenites and granites. These were often very large, consistingalmost entirely of feldspar and a little quartz; chlorite was present in considerablequantities where these dikes intruded the more basic formations. Batholitlis Batholitic intrusions of granite and felsite were seen, Imt were not of commonoccurrence. A considerable area of a ve

RMC34DBY–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

. The Quarterly journal of the Geological Society of London. is notgenerally possible to draw a sharp line of distinction between thesedifferent phenomena, but viewed as a whole the results are suffi-ciently characteristic. Moreover, the gradual appearance of thesefeatures, as the dykes are traced from the quartz-felsite into thesedimentary strata towards the east, is a proof that the deformingagency operated from an easterly direction. IV. Conclusion. In view of the phenomena described in the foregoing pages, it doesnot seem possible to escape from the conclusion that we have in theLlyn-Padar Stock Photo

RM2AFJF47–. The Quarterly journal of the Geological Society of London. is notgenerally possible to draw a sharp line of distinction between thesedifferent phenomena, but viewed as a whole the results are suffi-ciently characteristic. Moreover, the gradual appearance of thesefeatures, as the dykes are traced from the quartz-felsite into thesedimentary strata towards the east, is a proof that the deformingagency operated from an easterly direction. IV. Conclusion. In view of the phenomena described in the foregoing pages, it doesnot seem possible to escape from the conclusion that we have in theLlyn-Padar

RMC34DB3–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

The Quarterly journal of the Geological Society of London . spilite.To this fault may be attributed, not only the crushed character of 114 ME. GAKDIKEE AND PROF. EEY^OLDS OJST THE [June 1914, the felsite, but possibly also the apparent thickness of the bostonitewhich may be swung round by the fault. As the big felsite-niasssouth of Curraghrevagh hamlet is unaffected by this fault, it isprobably a post-Silurian intrusion. Taking the Lough Nafooey and Kilbride areas together, thebostonite-sill has been traced almost continuously for a distanceof 7 miles. How much farther it extends is unknown, b Stock Photo

RM2ANFC31–The Quarterly journal of the Geological Society of London . spilite.To this fault may be attributed, not only the crushed character of 114 ME. GAKDIKEE AND PROF. EEY^OLDS OJST THE [June 1914, the felsite, but possibly also the apparent thickness of the bostonitewhich may be swung round by the fault. As the big felsite-niasssouth of Curraghrevagh hamlet is unaffected by this fault, it isprobably a post-Silurian intrusion. Taking the Lough Nafooey and Kilbride areas together, thebostonite-sill has been traced almost continuously for a distanceof 7 miles. How much farther it extends is unknown, b

RMC34E5Y–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

The Quarterly journal of the Geological Society of London . slate in the quarry, and if there be any grit it is notolder than the felsite. This is what I found. A greenstone dykehas been almost quarried out, and the felstone is left as a kind ofminiature cliff overlooking the valley. Part of the greenstone isshown in Mr. Blakes plan; but its northward prolongation shouldnot be represented as adjoining a band of grit, for it runs continu-ously in contact with the felsite ; and the greenstone should not belimited on the plan to the northern end of the quarry, for it can betraced, by means of sma Stock Photo

RM2AN4RTW–The Quarterly journal of the Geological Society of London . slate in the quarry, and if there be any grit it is notolder than the felsite. This is what I found. A greenstone dykehas been almost quarried out, and the felstone is left as a kind ofminiature cliff overlooking the valley. Part of the greenstone isshown in Mr. Blakes plan; but its northward prolongation shouldnot be represented as adjoining a band of grit, for it runs continu-ously in contact with the felsite ; and the greenstone should not belimited on the plan to the northern end of the quarry, for it can betraced, by means of sma

RMC34E33–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

. The Quarterly journal of the Geological Society of London. the screes that, on turninground, he saw numbers of stones shuffling and rolling down thesurface. Stones of all sizes were involved, blocks of felsite up to 2 feetin diameter among them, the larger moving more quickly than theothers, and the noise caused during their motion was so great thatit finally drowned the rumbling of the earthquake. The screescontinued unstable for five minutes, and, at the end of that time,hundreds of newly-fallen blocks were to be seen lying at thebase.2 1 Quart. Journ. Geol. 8oc. vol. xliv (1888) pp. 232-3 Stock Photo

RM2AFKAPR–. The Quarterly journal of the Geological Society of London. the screes that, on turninground, he saw numbers of stones shuffling and rolling down thesurface. Stones of all sizes were involved, blocks of felsite up to 2 feetin diameter among them, the larger moving more quickly than theothers, and the noise caused during their motion was so great thatit finally drowned the rumbling of the earthquake. The screescontinued unstable for five minutes, and, at the end of that time,hundreds of newly-fallen blocks were to be seen lying at thebase.2 1 Quart. Journ. Geol. 8oc. vol. xliv (1888) pp. 232-3

RMC34DN8–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

Annual report . ng considerable visible gold.The deposit appears to end. or pass into stringers, immediately east of the shaft. 1920 West Shiningtree Gold Area 49 but the vein can be traced intermittently to the west for about l.OUO feet, exceptwhere it is intruded by narrow dikes of diabase or felsite. The wall rocks are pillowlavas altered to hornblende, chlorite and carbonate schists. The deposit comprisesa quartz vein from one to three feet wide, with some stringers carrying gold onboth the hanging wall and fuotwall. Numerous showings of gold occur along thesurface of the vein for 100 feet Stock Photo

RM2AWGX5T–Annual report . ng considerable visible gold.The deposit appears to end. or pass into stringers, immediately east of the shaft. 1920 West Shiningtree Gold Area 49 but the vein can be traced intermittently to the west for about l.OUO feet, exceptwhere it is intruded by narrow dikes of diabase or felsite. The wall rocks are pillowlavas altered to hornblende, chlorite and carbonate schists. The deposit comprisesa quartz vein from one to three feet wide, with some stringers carrying gold onboth the hanging wall and fuotwall. Numerous showings of gold occur along thesurface of the vein for 100 feet

RMC34D72–Detail of Rock formations from Nigg Bay (SSI), Aberdeenshire, Scotland noted for its geology with rocks 500 million years old

. Geological magazine. f long ellipsoidal joint-surfaces. These at one placeare crossed and partly obliterated by a set of wavy joints, so thatthe rock is cut up into small rhomboidal pieces. Where the fissilestructure is best developed, there the cross-joints are least. Towardsthe eastern end the divisional planes of the fissile structure curveround, and really form parts of flattened spheroidal surfaces, and inso doing cut the banded structure at high angles (Fig. 1). 1 Mentioned by Bryce, Geology of Arran, p. 72. ^ The base of the felsite near the basalt has a vitrified appearance and has a Stock Photo

RM2AFT1MR–. Geological magazine. f long ellipsoidal joint-surfaces. These at one placeare crossed and partly obliterated by a set of wavy joints, so thatthe rock is cut up into small rhomboidal pieces. Where the fissilestructure is best developed, there the cross-joints are least. Towardsthe eastern end the divisional planes of the fissile structure curveround, and really form parts of flattened spheroidal surfaces, and inso doing cut the banded structure at high angles (Fig. 1). 1 Mentioned by Bryce, Geology of Arran, p. 72. ^ The base of the felsite near the basalt has a vitrified appearance and has a

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