| Sample: |
Sample No. No Data -- USGS No. Mesozoic loc. 35008
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| Locality: |
Field No. No Data
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| Description: |
Eagle C-1 quadrangle, lat 64o 31'09" N., long 141o 25'42" W. Seventymile terrane. Unit Pq of Foster (1976); quartzite and argillite that includes unmetamorphosed to slightly metamorophosed phyllite, metaconglomerate, chert, limestone and (or) marble, and graywacke to metagraywacke. Core consists of gray and black carbonaceous, quartzose limestone that is locally recrystallized and has poorly developed styolites, as well as minor white calcite veins, rare quartz veins as much 1.3 cm in diameter, and scattered pryite. From WGM, Inc.'s drilling of Doyon Ltd.'s Lead Creek property, diamond-drill hole LC-7; core split vertically from 731.6 to 741.1 ft below the surface. Collected by WGM, Inc., geologists and submitted to C. Dusel-Bacon; identified by A.G. Harris. (description from Dusel-Bacon and Harris, p. 12 (table 1)). |
| Location: |
Alaska Quadrangle: Eagle C-1
Lat.: 64o31'09 " Long.: 141o25'42 " |
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Reference
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| Title: |
New occurrences of Late Paleozoic and Triassic fossils from the Seventymile and Yukon-Tanana terranes, east-central Alaska, with comments on previously published occurrences in the same area
,
2003
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Abstract - The discovery of several new fossil occurrences of late Paleozoic conodonts and radiolarians in the Seventymile and Yukon-Tanana terranes, and of Late Triassic conodonts in the Seventymile terrane in east-central Alaska, has prompted a reevaluation of other late Paleozoic and Triassic fossils reported in the same areas. The report, in 1995, of giant parafusulinids in the Seventymile terrane within the same stratigraphic interval that more than 20 years before produced poorly preserved Permian brachiopods helped place these beds in the middle Guadalupian and to position the terrane at tropical to subtropical latitudes near ancestral North America during the Middle Permian. ..... |
| Report by: |
Cynthia Dusel-Bacon
,
Anita G. Harris
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| | Age: | Norian (no older than early early Norian) |
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| CAI: | Min: 5 |
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| Comment: | CAI=5, indicating that the host rock reached at least 300o C. Age: No older than E. quadrata Zone (no older than early early Norian, exclusive of Upper M. primitius Zone); see figure 4 for late Carnian and early Norian conodont zonation. Remarks: 9.8 kg of rock was processed; 3.42 kg did not break down. Heavy-mineral concentrate: chiefly rhombohedral dolomite, euhedral pyrite, carbonaceous flakes, quartz, minor composite ferruginous flakes, conodonts, phosphatized sponge fragments, and rare well-rounded zircons. Shown as fossil locality 1 on figure 3. |
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