Alaska Paleontological Database

Sample Detail

Sample:	Sample No. 81ABe52A -- USGS No. 9475-CO
Locality:	Field No. 81ABe52A
Description:	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)
Location:	Alaska Quadrangle: Wiseman C-3 Township&Range: T34N R17W Section: N1/2 sec. 25

Reference

Title:	Middle Cambrian fossils from the Doonerak Anticlinorium, central Brooks Range, Alaska , 1984
	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.
Report by:	J. Thomas Dutro , Jr. , A. R. Palmer , John Repetski , William P. Brosge


Age:	Amgan (probably early Middle Cambrian (Amgan))






Comment:	Other samples, from two localiteis in the gray marbles, also contain microfossils which, according to Repetski, inclue Westergaardodina sp., a paraconodont that ranges from Middle Cambrian into Early Ordovician in many parts of the world. These Alaskan occurrences in the lower Middle Cambrian provide the oldest record for Westergaardodina.