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Reference
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| Title: |
Report on Referred Fossils
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1971
(11/17)
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My conclusions regarding two of your 1971 collections from the Petersburg A-3 quad are as follows. [Comment by R.B. Blodgett - this "E&R" is actually in the form of letter]
Representative specimens from these collections have been added to the Triassic reference collections of the P&S Branch in Menlo Park. |
| Report by: |
Norman J. Silberling
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| Referred by: |
Henry C. Berg
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| | Age: | Carnian-Norian (late Carnian - mid middle Norian) |
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| Comment: | Based on the occurrence of Halobia of the H. ornatissima-H. cordillierana kind, this collection is of late Karnian to mid middle Norian age. Also present are:
Atractites -- a coleoid or "belemnite"
bone fragments, and
a minute ammonite or low-spired gastropod -- indeterminate in either case.
This colection is older than any known North American occurrence of Heterastridium which is characteristic of the upper Norian. |
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