Report on Referred Fossils |
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| Stratigraphic range: |
Permian |
| Kinds of fossils: |
Marine invertebrates |
| Quadrangle or area: |
Holy Cross & Russian Mission Quads, Alaska, southwestern |
| Shipment No.: |
A-60-16 |
| Referred by: |
Hoare, Joseph M.
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| Report prepared by: |
Dutro, J. Thomas, Jr.
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Duncan, Helen
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Douglass, Raymond C.
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| Date: |
11/16/1961 |
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SummaryThese three collections are probably all of Permian age, most likely Early Permian. There is a suggestion that the limestone of 60AHr44 is slightly younger than the grit of 60AHr46. The third collection contains nothing diagnostic, but comparable bryozoan material occurs in rocks assigned to the Permian in southeast Alaska.
Collection 60AHr46 contains the fusuline Schwagerina? in addition to bryozoans of early Permian aspect. Collection 60AHr44 contains Anidanthus sp., Liosotella? and other brachiopods commonly encountered in Permian assemblages elsewhere in Alaska. This collection is probably younger than the Schwagerina-bearing assemblage but is not late Permian in the sense of the Arctic Permian of northern Alaska and the Canadian Arctic Islands. Wannerophyllum, a verbeekiellid coral, according to Helen Duncan has been described from middle and upper Permian of Timor, the Artinskian of Russia and the “middle Permian” of West Australia.
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***
Brief statement of problem and remarks (from collector):
Problem is to determine the age of the rcok from which the fossils were obtained.
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| User Note module to be added |
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60AHr44
(19998-PC)
, Holy Cross
, Locality: Location determined on Holy Cross 1:250,000 map, 1951 Edition. Corods: 10.8, 0.15, Long. 160 deg. 41.5', Lat. 62 deg. .4'. About 34 miles S66 deg. W of town of Holy Cross, on north bank of Tuckers Slough; at point where Tuckers Slough is farthest north; about 1/4 mile downstream from mouth of a large clear-water stream. Fossils occur in hard, fine-grained bluish gray limestone.
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productoid brachiopod, undet.
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ambocoelid brachiopod, indet.
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martinioid brachiopod, indet.
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60AHr46
(19999-PC)
, Russian Mission
, Locality: Location determined on Russian Mission 1:250,000 map, 1950 Edition. Coords: 9.9, 17.3, Long. 160 deg. 50', Lat. 61 deg. 59'. about 6.3 miles N52E of mouth of Tuckers Slough, about 4.1 miles N46W from Peters Point on east end of Pearl Island, outcrop about 30 feet long and 15 feet high on north bank of Tuckers Slough. Small fragments of brachiopods, bryozoa, and crinoid columnals occur in highly calcareas grit or breccia.
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echinoderm debris, indet.
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ramose bryozoan fragments, indet.
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martinioid brachiopod, indet.
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60AHr59
, Russian Mission
, Locality: Location determined on Russian Mission, 1:250,000 map, 1950 Edition. Coords: 5.5, 12.95, Long. 161 deg. 20', Lat. 61 deg. 44.2'. About 3 miles south of village of Russian Mission on west bank of Yukon River. Fossil fragments, chiefly crinoid columnals occur in hard, dark gray, pebbly limestone. Scattered limestone boulders lie on the river bank. Most of rocks are volcanics with interbedded quartzite grit and conglomerate.
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echinoderm debris, indet.
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