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Reference
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| Title: |
Upper Cretaceous Pelecypods of the Genus Inoceramus from Northern Alaska.
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1960
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Abstract--Upper Cretaceous rocks in the Colville River region of northern Alaska contain a fauna consisting of five species of Inoceramus, all of which are known from other localities, either in the United States, Canada, Europe, or elsewhere. Associated fossils include a small number of pelecypod species, a few species of gastropods, and several species of ammonites. The species of Inoceramus range in age from Cenomanian to the Santonian or early Campanian, but none are of Coniacian age. Upper Cretaceous rocks in the Colville River region are divided into three formations, which are, in ascending order, the Ninuluk, the Seabee, and the Schrader Bluff. Inoceramus (Inoceramus) dunveganensis McLearn, of Cenomanian age, is abundant in the Ninuluk formation. Inoceramus (Mytiloides) labiatus (Schlotheim) and I. aff. I. (Inoceramus) cuvierii Sowerby occur in the lower part of the Seabee formation of early Turonian age. Inoceramus. aff. I. (Inoceramus) cuvierii occurs alone in the upper part of the Seabee, which probably is of middle to late Turonian age. There is no evidence that this species extends into the Coniacian in northern Alaska. The Barrow Trail member of the Schrader Bluff formation contains Inoceramus (Sphenoceramus) patootensis de Loriol and I. (S). steenstrupi de Loriol, both of late Santonian to early Campanian age. The precise age of the lower and upper members of the Schrader Bluff formation is not certain. |
| Report by: |
David L. Jones
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George Gryc
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| | Age: | Santonian-Campanian (late Santonian - early Campanian) |
| Formation: | Schrader Bluff Formation - Barrow Trail Member (Barrow Trail Member of Schrader Bluff Formation) |
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| Comment: | The Barrow Trail member of the Schrader Bluff formation contains Inoceramus (Sphenoceramus) patootensis de Loriol and I. (S.) steenstrupi de Loriol, both of late Santonian to early Campanian age. (from p. 149) The Barrow Trail member of the Schrader Bluff formation contains Inoceramus (Sphenoceramus) patootensis de Loriol and I. (S.) steenstrupi de Loriol of middle Santonian to early Campanian age. These two species are also known from Canada, Greenland, England, Germany, and elsewhere. (from p. 153) |
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