. Cretaceous deposits of the eastern Gulf region and species of Exogyra from the eastern Gulf region and the Carolinas. Geology, Stratigraphic; Geology; Bivalves, Fossil. 24 CRETACEOUS DEPOSITS OF THE EASTERN GULF REGION. In determining the fossils and preparing the lists on which the tables are based the writer was hampered by the fact that the types of many of the species were not at hand for comparison and that he had to depend on published descriptions and illustrations. The lists must therefore be regarded as of a preliminary character. For this reason it is to be expected that the ex- ha

. Cretaceous deposits of the eastern Gulf region and species of Exogyra from the eastern Gulf region and the Carolinas. Geology, Stratigraphic; Geology; Bivalves, Fossil. 24 CRETACEOUS DEPOSITS OF THE EASTERN GULF REGION. In determining the fossils and preparing the lists on which the tables are based the writer was hampered by the fact that the types of many of the species were not at hand for comparison and that he had to depend on published descriptions and illustrations. The lists must therefore be regarded as of a preliminary character. For this reason it is to be expected that the ex- ha Stock Photo
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RE5YAC

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. Cretaceous deposits of the eastern Gulf region and species of Exogyra from the eastern Gulf region and the Carolinas. Geology, Stratigraphic; Geology; Bivalves, Fossil. 24 CRETACEOUS DEPOSITS OF THE EASTERN GULF REGION. In determining the fossils and preparing the lists on which the tables are based the writer was hampered by the fact that the types of many of the species were not at hand for comparison and that he had to depend on published descriptions and illustrations. The lists must therefore be regarded as of a preliminary character. For this reason it is to be expected that the ex- haustive studies of the faunas of the region soon to be under- taken will show the necessity for many changes in nomencla- ture and will reveal some errors in the determinations of genera and species. It is also to be expected that some species now regarded as restricted in range within certain limits will be found also at higher or lower horizons. But this lessening of the number of restricted forms wiU probably be offset by the discovery of new restricted forms, and by the recognition of specific differences in forms now regarded as having wide vertical ranges. It is believed, however, that such changes as are found necessary will be of minor importance as regards their effect upon the major conclusions reached through these preliminary studies. Many questionably identified species and many forms identified generically only have been omitted from the tables. Table 1.âRange of Cretaceous fossils in irestern Tennessee." [Area 1 on sketch map, fig. 2.]. Figure 2.âSketch map showing areas of paleontologic collections listed in Tables 1 to 8. numbers on the map correspond with the numbers of tho tables. The Impure Ripley for- phase of mation. Selma chalk. Exogyra Exogyra costata pondcrosa zone. zone. Species. 1 o si a jj ^ ° !» g So Cj v. s 5 '{â si 11 1*1 72 8° ^c T3 j: j, si - KJ a a Mollusca: x X 0. larva Lamarck X X X X X X x X X X X X X x X x X X X x X X a The

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