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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: | According to Request for Paleontological Analysis form submitted by Reed, this locality is from his Group B, consisting of 18 fossil collections from a unit presently assigned to the volcanoclastic unit (or the red bed and limestone unit of Jones, Pessagno, and Csejtey).
Same form states: "Thin section of light greenish gray, calcareous, coarse gritty sandstone with abundant light colored chert and siltstone clasts. Interbedded with minor limestone and siltstone. Thin section contains bryozoa?" |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Crinoids |
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crinoid columnals |
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Thin section of calcareous quartzo-feldspathic lithic sandstone or sandy limestone containing abundant crinoid ossicales. The grains circled in ink are echinodermal, probably criniod columnals. |
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