of
Sample: Sample No. 68ABg766 -- USGS No. USGS Mesozoic loc. M5093
Locality: Field No. 68ABg766
Description: Pelecypods in thin bedded black (carbonaceous) slaty limestone interbedded with siltstone & slate that overlies rhyolitic volcanics to the south. Unit may correlate with with Halobia-bearing black limestone in Threemile Cove on SW Gravina Island. Mid-low tidal zone; about 2.25 miles SSW of Bostwick Point.
Location: Alaska Quadrangle: Ketchikan A-6
Lat.: 55o11.5 ' Long.: 131o42.95 '
Reference
Title: Report on Referred Fossils ,  1968 (11/18)
Transmittal sheet from Berg states: "There are at least 3 apparently contradictory reports (copies attached) on Mesozoic fossil collection from the Bostwick Inlet area of southern Gravina Island. Unfortunately, the maps showing the locations of these early collections are either missing or too sketchy to determine their exact location, and because the area is structurally complex, the reports are virtually useless. The present collections, which are probably at least partly equivalent to some of the early ones, were made during a reconnaissance study of Bostwick Inlet and probably are incomplete. I hope, however, that they will serve as a basis, at least, for working out the stratigraphy & structure of southern Gravina Island.
Report by: Norman J. Silberling
Referred by: Henry C. Berg
Age: Norian-Norian (early Norian - middle Norian)
Comment:collection 766 is older than collection 767
Occurrence(s)
No. Group Name Qty Notes
1 Bivalves Halobia sp. indet. like such species as H. alaskana Smith, H. halorica Mojsisovics, and H. dilitata Kittl that are of early and middle Norian age