Reference
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Title: |
Report on Referred Fossils
,
1936
(02/06)
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The following is my report upon two collections from the Nushagak-Tikchik district, Alaska, referred to me under the accompanying letter dated October, 1935. Both collections can be identified as representing the Permian fauna of Alaska. The species which I recognize in them are shown in the accompanying lists. [Note by R.B. Blodgett: found on p. 2751, 2753-4 of the Alaskan Fossil Reports, v. 12 (1935-1947), kept in Tech. Data Archives office in Anchorage, Alaska] |
Report by: |
George H. Girty
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Referred by: |
J. B. Mertie
, Jr.
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| Age: | Permian |
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Title: |
The Nushagak District, Alaska
,
1938
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Report by: |
J. B. Mertie
, Jr.
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| Age: | Permian |
Formation: | Unnamed (Unnamed Permian limestone) |
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Comment: | p. 44 These two collections, though generally similar, differ in some minor respects from one another in the genera and species included. This may be due in part to incomplete collecting but is possibly due in some measure to the fact that collection 8007 came from the middle part of the formation, whereas collection 8008 came from the upper part. In all, about 10 genera and 20 species are represented in these two collections, and together these fossils have been definitely identified by Dr. Girty as Permian. A specimen of hematitic limestone at the top of the formation was also found in thin section to contain minute fossils, which, according to P.V. Roundy, of the Geological Survey, include echinoids, corals, bryozoans, and foraminifers. These add nothing definite to the determination of the age of the limestone but show the presence of a somewhat different fauna which lived near the end of the period of limestone deposition, when the effects of volcanism in this district may have changed to some extent the chemical composition of the marine waters. |
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