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Reference
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| Title: |
Report on Referred Fossils
,
1955
(11/04)
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These collections that have been submitted have furnished information that should be of interest to many geologists and are well worth keeping in the Survey Collections. Their value would be greater if the locations of the various collections were shown on index maps. These would be filed with the reports and be available for future use by anyone. Such maps would be appreciated, especially for areas in which localities are difficult to describe. [Note: these collections were referred by C.E. Kirschner through George Gates] |
| Report by: |
Ralph W. Imlay
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| Referred by: |
Charles E. Kirschner
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| | Age: | Late Jurassic |
| Formation: | Naknek Formation |
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| Comment: | The upper faunal zone in the Naknek formation is characterized by Aucella mosquensis (von Buch) and Aucella rugosa (Fischer). This zone is overlain near the southern end of the Alaskan Peninsula by the Staniukovich shale which is characterized by Aucella piochi Gabb (Imlay, 1952, G.S.A. Bull, vol. 63, p. 978). The zone of Aucella piochi has been found elsewhere in Alaska in the Nutzotin Mountains (1954, Imlay and Reeside, G.S.A. Bull., vol. 65, p. 235) and on Admiralty Island (1954, Imlay and Reeside, G.S.A. Bull., vol. 65, p. 227). You may recall that Aucella piochii is the most common fossil in the Knoxville formation in California, which formation is thousands of feet thick. These facts emphasize that the Naknek formation does not represent the latest Jurassic. |
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