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Reference
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| Title: |
Report on Referred Fossils
,
1977
(03/15)
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This report treats the 36 collections that are included in Groups B and C on the transmittal forms. Those collections that contain recognizable, reasonably age-diagnostic fossils are all of late Norian (late Late Triassic) age. From our understanding of the stratigraphic section on strike north-east of the Eldridge Glacier in the Healy Quadrangle, rocks of this age from the uppermost part of the red-bed unit and the lower part of an intergradational but stratigraphically overlying unit of brown calcareous andstone and argillite. The conspicuou limestone and basalt unit stratigraphically underlies the red beds, but it is evidently still no older than Late Triassic. In the Healy (A-6) Quadrangle most of the Triassic rocks above the structually highest serpentine belt on the ridge northeast of Partin Creek are demonstrably overturned.
Thin sections of limestone 76ANs55G, 76ACo45, 46A through -46D, 76ANs57A, and 76AR240 are being prepared. If anything diagnostic appears in them, I will let you know. Your thin sections and their corresponding rocks samples are being returned. Otherwise all of the material, except for that assigned USGS Mesozoic locality numbers, has been discarded. |
| Report by: |
Norman J. Silberling
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| Referred by: |
Bruce Reed
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| | Age: | No Data |
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| Comment: | These "pinwheels" are oddly oriented cross-sections through large nautilus shells.
Silberling further states : "These clastics seem to connect along strike several jiles farther northeast with a large patch of much-deformed fossiliferous Cretaceous and Jurassic rocks that are faulted and folded into the Upper Triassic. These nautiloids, however, are not likely to be of late Mesozoic age according to Dave Jones, but they would be right at hoe in the lower part of the Upper Triassic brown sandstone unit. This locality may therefore be in a sliver of the brown sandstone unit that stratigraphically overlies the red beds but that here is faulted into the basalt and limestone unit."
Request for Examination of Fossils form sumitted by Reed states: "Pinwheel shaped creatures in volcanic sandstone, associated with volcanic agglomerate flow. |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Nautiloids |
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nautiloids |
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