Alaska Paleontological Database

Sample Detail

Sample:	Sample No. 79ADt85
Locality:	Field No. 79ADt85
Description:	Ugashik A-4 quad., sec. 20, T. 36 S., R. 49 W., lat. 57^o 03 min. 24 sec. N., long. 157^o 10 min. 50 sec. W., 6 miles south of south end of Needle Lake. Naknek Formation, upper part part, thin-bedded greenish-gray siltstone.
Location:	Alaska Quadrangle: Ugashik A-4 Township&Range: T36S R49W Section: Sec. 20 Lat.: 57^o03^'24 ^" Long.: 157^o10^'50 ^"

Reference

Title:	Report on Referred Fossils , 1979 (08/31)
	The fossils from locality 79ADt-129 are definitely of late early or middle Callovian age as shown by the presence of Pseudocadoceras and Cadoceras. The same age is suggested for locality 79ADt-128 as shown by the presence of a fragment resembling Pseudocadoceras. A late middle Oxfordian to late Kimmeridgian age is shown by the presence of Buchia concentrica (Sowerby) at localities 79ADt-85, 79ACe-64 and 79ACe-73B. The presence of Buchia sp. at locality 79ACe-48A shows that the associated Phylloceras (Partschiceras) is not older than late middle Oxfordian. The specimen of Phylloceras (Partschiceras) at locality 79ACe-75 is identical with a species in the Naknek Formation that I am describing in an unpublished paper on Upper Jurassic ammonites from Alaska.
Report by:	Ralph W. Imlay
Referred by:	Robert L. Detterman


Age:	Oxfordian-Kimmeridgian (late middle Oxfordian - late Kimmeridgian)
Formation:	Naknek Formation





Comment:	A late middle Oxfordian to late Kimmeridgian age is shown by the presence of Buchia concentrica (Sowerby) at localities 79ADt085, 79ACe-64 and 79ACe-73B.