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Reference
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| Title: |
Report on Referred Fossils
,
1976
(11/09)
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The fossils at Mesozoic locality 31270 (76AR17) are definitely early Sinemurian as shown by the presence of arietitid ammonites resembling Coroniceras. Locality 31272 (76AR13C) is definitely Early Jurassic as shown by the presence of Weyla. Locality 31267 (76ADt147) contains a species of Gryphaea that resembles G. rockymontana Warren from beds of Sinemurian age in the Fernie Formation of British Columbia and Alberta. The abundance of brachiopods at localities 31267 (76ADt147), 31269 (76AR16A) and 31271 (76AR13B) favors an Early Jurassic age, although brachiopods have been found rather uncommonly in the Middle Jurassic of Alaska. The collections at the remaining localities are too fragmentary for an age determination. The ariertitid ammonites at locality 31270 (76AR17) greatly resemble those at locality 30908 (75AR39) in the Talkeetna (C-6) quad. The oyster at locality 30907 (75AR38A) that I referred to Ostrea is now assigned to Gryphaea cf. G. rockymontana Warren. [Note by R.B. Blodgett: the report was dated as 1986, an obvious typing mistake as it was received and stamped by the Alaskan Geol. Br. in Menlo Park on March 15, 1976] |
| Report by: |
Ralph W. Imlay
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| Referred by: |
Bruce Reed
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| | Age: | Sinemurian |
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| Comment: | Locality 31267 (76ADt147) contains a species of Gryphaea that resembles G. rockymontana Warren from beds of Sinemurian age in the Fernie Formation of British Columbia and Alberta. The abundance of brachiopods at localities 31267 (76ADt147), 31269 (76AR16A) and 31271 (76AR13B) favors an Early Jurassic age, although brachiopods have been found rather uncommonly in the Middle Jurassic of Alaska. |
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