Sample Detail of
Sample: Sample No. 34AD-435 -- USGS No. M16933
Locality: Field No. 34AD-435
Description: Gravina Island, Alaska. Orig. No. 34AD-435. Triassic—Gravina Island, S.W. side of Bostwick Inlet, about 5 ½ miles from Dall Head, S.E. Alaska. Coll.: A.H. Koschmann. 1934. [Prob. Jurassic. Returned to USNM at request of R.W. Imlay, 10/16/61. (NJS)]
Location: Alaska Quadrangle: Ketchikan A-6
Reference
Title: Report on Referred Fossils ,  1971 (03/15)
Report by: Norman J. Silberling
Referred by: Henry C. Berg
Age: Late Triassic
Comment:I have no objection to assigning an Upper Triassic (probably upper Upper Triassic) stratigraphic position to this collection, but I can't prove it belongs here rather than in the Lower Jurassic.
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Plicatula cf. P. perimbricata Gabb occurs in the high upper Norian +/-?; genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
2 Bivalves "Entolium" genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
3 Bivalves Pectinid - cf. Tosapecten? genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
4 Bivalves small pteriid
5 Bivalves Pinna sp. genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
6 Bivalves Plagiostoma sp. ribbing not like that from upper Norian of Keku Strait (USGS M1912); genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
7 Bivalves Variamusium? genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
8 Bivalves Gryphaea sp. genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
9 Bivalves "Pleuromya" very smilar to spp. in M1912; genus (but not necessarily species) in common with upper Norian of Keku Strait (USGS M1912)
10 Bivalves indet. bivalves