Sample Detail of
Sample: Sample No. 69ABg130F -- USGS No. USGS Mesozoic loc. M5909
Locality: Field No. 69ABg130F
Description: Pelecypod- and ammonite-bearing, dark olive-weathering silty limestone interbedded with coarse andesite- and limestone-clast volcanic breccia. Many of the limestone clasts contain fossils like those in the limestone beds, which are thin and discontinuous. Southwest shore of Bostwick Inlet, essentially at entrance.
Location: Alaska Quadrangle: Ketchikan A-6
Lat.: 55o12.3 ' Long.: 131o43.4 '
Reference
Title: Report on Referred Fossils ,  1969 (11/17)
This report concerns the shelly faunas collected by Berg and Jones in 1969 and by Berg in 1968 from Bostwick Inlet, Gravina Island.
Report by: Norman J. Silberling
Referred by: Henry C. Berg
Age: Norian (late Norian)
Formation:Chapin Peak Formation (Revised; Robert B. Blodgett, 02/09/2008 )
Comment:These collections, which I presume are from a fairly retricted stratigraphic thickness, each contain at least one faunal element diagnostic of the upper Norian. They relate most closely to faunas known from Tyaughton Creek in western British Columbia, from Vancouver Island, and from the Gabbs Formation in western Nevada. Some of the species represented, such as the species of Cycloceltites, suggest a latest late Norian age, not Rhaetian but younger than faunas typical of the Suessi Zone and the commonly occurring kinds of Monotis such as M. subcircularis.
Occurrence(s)
No. Group Name Qty Notes
1 Ammonoids Placites sp.
2 Bivalves Minetrigonia cf. M. cairnesi (McLearn)
3 Bivalves Palaeopharus cf. P. buriji Kiparisova
4 Bivalves undet. pectenacid pelecypod
5 Snails undet. ornate gastropod

Title: Letter ,  1969 (06/03)
Letter from D.L. Jones to H.C. Berg.
Report by: David L. Jones
Referred by: Henry C. Berg
Age: Norian (late Norian)
Formation:Chapin Peak Formation (Revised; Robert B. Blodgett, 02/09/2008 )
Comment:Fossils from locality 69ABg130 are definitely Triassic (upper Norian). With the help of Norm Silberling, the following forms have been identified (see faunal list). Other unidentified forms are also present, but the above suffice for the late Norian age determination. Fossils from the "clast" appear to be the same types of things.
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Plicatula perimbricata Gabb
2 Bivalves Minetrigonia cf. M. suttonensis (Clapp & Shimer, 1911)
3 Bivalves Septocardia sp.
4 Ammonoids Halorites? sp.
5 Bivalves "Variamusium" sp.
6 Bivalves large trigonid? clam - genus and sp. unknown