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Reference
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| Title: |
Report on Referred Fossils
,
1983
(11/30)
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Referred by N.J. Silberling for R.M. Chapman |
| Report by: |
J. Thomas Dutro
, Jr.
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| Referred by: |
Norman J. Silberling
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| | Age: | Permian |
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| Comment: | This single brachiopod specimen is a syringothyroid of rather distinctive size and shape, even though the shell has been rather badly abraded. The assignment to PSEUDOSYRINGOTHYRIS must remain tentative because of the poor preservation of this specimen. Similar shells, in the collections of the U.S. National Museum, are from the Takhandit Limestone of east-central Alaska and from the Belcher Channel Formation of Arctic Canada. The closest specific correlation seems to be PSEUDOSYRINGOTHYRIS INOPINATUS Solitova, 1962, from the Lower Permian Dzheltin horizon of northeast USSR. All these other occurrences are Lower Permian, approximately equivalent to some part of our Leonardian. Whether this specimen actually is indigenous to the sediments is a separate problem which only local geologic details can solve. The shell has clearly been transported and abraded. However, it is not enclosed in a rock clast that might have had a different provenance. The isolated shell is filled with the same matrix as the surrounding material. I would speculate that, even if this shell were transported by a turbidity current into its final resting place, it may well be of about the same age as the enclosing volcanogenic clastic sediment. This is only a back-handed way of saying that it could date the rock in which it occurred. |
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