Sample Detail of
Sample: Sample No. 79ACe48A
Locality: Field No. 79ACe48A
Description: Ugashik A-4 quad., sec. 26, T. 36 S., R. 50 W., lat. 57o 02 min. 10 sec. N., long. 157o 15 min. 36 sec. W., 8.2 miles S. 24o W. of south end of Needle Lake. Naknek Formation, hornfelsed gray siltstone.
Location: Alaska Quadrangle: Ugashik A-4
Township&Range: T36S R50W Section: Sec. 26
Lat.: 57o02'10 " Long.: 157o15'36 "
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(Partschiceras) at locality 79ACe-75 is identical with a species in the Naknek Formation that I am describing in an unpublished paper on Upper Jurassic ammonites from Alaska.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: Late Jurassic (Late Jurassic (not older than late middle Oxfordian))
Formation: Naknek Formation
Comment:The presence of Buchia sp. at locality 79ACe-48A shows that the associated Phylloceras (Partschiceras) is not older than late middle Oxfordian.
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Phylloceras (Partschiceras) sp. B
2 Bivalves Buchia sp.