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Authors: |
Dutro, J. Thomas, Jr.
,
Palmer, A. R.
,
Repetski, John
,
Brosge, William P.
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Editors: |
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Date: |
/1984 |
Title: |
Middle Cambrian fossils from the Doonerak Anticlinorium, central Brooks Range, Alaska |
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58 , 6 , 1364-1371 , 3 figs. |
Host: |
Journal of Paleontology : |
Document Type: |
Article\Abst.\Chapter\report |
Annotation: |
Abstratct--Middle Cambrian fossils collected near Wolf Creek in the Wiseman quadrangle, northern Alaska, include trilobites and paraconodonts. Trilobites date the strata as early Middle Cambrian, correlative with the Amgan Stage of Siberia. The assemblage includes: Kootenia cf. K. anabarensis Lermontova, cf. "Parehmania" lata Chernysheva and Pagetia sp. Specimens of the paraconodont genus Westergaardodina, from the same sample as the megafossils, record the earliest known occurrence of this taxon. These fossils, the first to establish an age for part of the sedimentary sequence in the Doonerak Anticlinorium, are the oldest fossils yet taken from the central and western Brooks Range. |
UserNote |
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81ABe52A
(9475-CO)
, Wiseman
, Made along the high ridge about 4 mi east of the junction of Wolf Creek and the Tinayguk River in the Wiseman C-3 quadrangle, N1/2 sec. 25, T34N, R17W, elevation 4,520 ft. Collection 81ABe52A (USGS 9475-CO) is from near the top of a 20 m-thick, massive limestone, about 100 m north of the main saddle in the flat-topped ridge; this limestone crops out in an east-facing cliff and is underlain by a greenstone dike. (description from Dutro and others, 1984, p. 1367)
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81ABe52B
(9476-CO)
, Wiseman
, Collection made along the high ridge about 4 mi east of the junction of Wolf Creek and the Tinayguk River in the Wiseman C-3 quadrangle, N1/2 sec. 25, T34N, R17W, elevation 4,520 ft. Collection 81ABe52B (USGS 9476-CO) and 81ABe52C (USGS 9477-CO) are from a traverse down a minor spur to the west of the main saddle. USGS 9476-CO is from a 20 m-thick limestone, perhaps the same unit as USGS 9475-CO. USGS 9477-CO is from a lenticular bed of brown sandy carbonate rock, about 3 m above the top of the massive limestone. (description from Dutro and other, 1984, p. 1367)
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81ABe52C
(9477-CO)
, Wiseman
, Collection made along the high ridge about 4 mi east of the junction of Wolf Creek and the Tinayguk River in the Wiseman C-3 quadrangle, N1/2 sec. 25, T34N, R17W, elevation 4,520 ft. Collection 81ABe52B (USGS 9476-CO) and 81ABe52C (USGS 9477-CO) are from a traverse down a minor spur to the west of the main saddle. USGS 9476-CO is from a 20 m-thick limestone, perhaps the same unit as USGS 9475-CO. USGS 9477-CO is from a lenticular bed of brown sandy carbonate rock, about 3 m above the top of the massive limestone; these sand carbonate beds contain the trilobites and occur in a 10 m-thick unit of black argillite and quartz siltstone. (description from Dutro and other, 1984, p. 1367)
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Kootenia cf. K. anabarensis Lermontova
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cf. "Parehmania" lata Chernysheva
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