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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
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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
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Anita G. Harris
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| | Age: | Late Paleozoic (Late Paleozoic, possibly Mississippian) |
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| Comment: | Shown as fossil locality 4 on figure 3. Terrane assignment, map unit, and sample lithology: Chicken Metamorphic Complex (Werdon and others, 2001) of uncertain origin. Collected near confluence of Napoleon Creek and the South Fork of the Fortymile River. Sample is from metalimestone interlayered with greenstone. (from p. 12) Conodonts of late Paleozoic age were recovered from marble in unit Pzq of Foster (1976) in the Eagle quadrangle: at one locality from the quartz-chlorite-muscovite +or- calcite schist, micaceous quartzite, and marble unit of the Nisultlin assemblage, Yukon-Tanana terrane (loc. 3, fig. 3; table 1), and at the other locality from the greenschist-facies Chicken Metamorphoic Complex of Werdon and others (2001) of uncertain origin (loc. 4, fig. 3; table 1). Both collections contain poorly preserved late Paleozoic, possibly Mississippian conodonts (T.R. Carr, formerly ARCO Oil and Gas Co., oral commun. to H.L. Foster, 1985). (from p. 17) |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Conodonts |
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poorly preserved conodonts of late Paleozoic age |
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id. by T.R. Carr |
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