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Reference
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| Title: |
Report on Referred Fossils
,
1964
(07/10)
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| Report by: |
F. Stearns MacNeil
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| Referred by: |
George Plafker
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| | Age: | Eocene |
| Formation: | Orca Group |
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| Comment: | The best guess on the age of these fossils would now seem to be Eocene, either middle or late. No trace of Inoceramus prisms could be found, and as far as I can see there are no possible slants in interpretation of the fossils that would even make a Mesozoic age possible. Iam inclined to believe that a Cretaceous age is most unlikely. |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Decapods |
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Branchioplax washingtoniana Rathbun |
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According to Rathbun only this one known species can be referred to this genus. There are no known Cretaceous crabs with which it could be confused. Numerous occurrences of it are known from the Katalla and Tokun Fms of Alaska. The type and other material is from the Oligocene of Oregon and Washington. She also reports it from the Cowlitz, but Stenzel in a report to Miller says the Cowlitz material is too poor for positive identification; he says it is not present in any Eocene collections from Oregon sent to him for identification. |
| 2 |
Crabs, etc. |
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Raninoides vaderensis Rathbun |
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A larger and better preserved secimen show that this is R. vaderensis rather than R. eugenensis with which it was compared. R. vaderensis was described from late Eocene beds of Washington and Rathbun reported it also from supposed middle Eocene beds of Oregon. as stated before, she questions a reported Cretaceous record for the genus. |
| 3 |
Bivalves |
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Acila decisa (Conrad) |
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One of the concretions yielded several excellent molds with acid preparation. This species was described from an unknown locality in southern California. Thanks to the excellent treatment of this group by Schenck, it can be taken as a good guide fossil for the Eocene. Three synonyms of the species are well decumented stratigraphically, one of them A. lajollaensis Hanna having been accepted by Schenck as the neotype for the species. All of its known occurrences in California, Oregon, and Washington are in middle and late Eocene beds. |
| 4 |
Bivalves |
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Periploma cf. P. eodiscus Vokes |
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An excellent mold of this species was obtained with acid preparation. It has the same shape as Vokes' species. It shows the details of the sculpture but unfortunately Vokes' specimen does not. P. eodiscus was described from the Domengine (middle Eocene) of Califronia. |
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