Sample Detail of
Sample: Sample No. 59ABg416
Locality: Field No. 59ABg416
Description: Sitka D-2 coords: 2.58, 14.38. 57o 57.5'N., 134o 35.0'W. (description from Silberling E&R report) [Transmittal sheet of Lathram, dated August 12, 1959, provides following description: Thin to medium bedded fine to medium grained light gray to brown limestone and marble, interbedded with light to dark carbonaceous slate, light gray fine grained phyllite, or sericitic slate. Overlies, and is possibly infolded with, crystalline siliceous schist, greenschist, and graphitic schist. Contact is probably unconformable, and possible faulted.

The limestone is moderately to intensely deformed, and tight folding and shearing are dominant structural features. Lineated. Unit is not entirely exposed and thickness complicated structurally, but probably exceeds 75 feet. Possible Mesozoic - field stratigraphic assignment. Sitka D-2 coords: (2.58, 14.38) 57o 57.5'N, 134o 35.00'W]
Location: Alaska Quadrangle: Sitka D-2
Lat.: 57o57.5 ' Long.: 134o35.0 '
Reference
Title: Report on Referred Fossils ,  1959 (08/12)
Report by: Norman J. Silberling
Referred by: E. H. Lathram
Age: Late Triassic (Late Triassic(?))
Comment:The pelecypods in this collection are too fragmentary for positive identication, but appear to represent a Halobia with ribbing like that of H. ornatissima Smith. Also present are indeterminate spiriferid and perhaps other kinds of brachiopods and badly sheared coelenterates, some of which may be spongiomorph hydrozoans.

The Halobia-like pelecypods preclude a Paleozoic age, and in association with spiriferid brachiopods and coralline material, they strongly suggest a Late Triassic age assignment.

As this collection is not wanted for our P&S Branch reference collections, it is being returned to the Alaskan Branch office as requested.

Occurrence(s)
No. Group Name Qty Notes
1 Bivalves pelecypods that appear to represent a Halobia with ribbing like that of H. ornatissima Smith too fragmentary for positive identification
2 Brachiopods indeterminate spiriferid brachiopod
3 Brachiopods perhaps other kinds of brachiopods
4 Cnidaria badly sheared coelenterates, .....
5 Hydrozoans ..... some of which may be spongiomorph hydrozoans