Sample: |
Sample No. 91Tr36D -- USGS No. 31846-PC
|
Locality: |
Field No. 91Tr36D
|
Description: |
Howard Pass C-3. Lat. 68o 35.4' N., Long. 157o 37.7' W. Talus black from subcrop of very dark to brownish-gray, very fine grained, muddy, turbiditic limestone (grainstone and carbonate mudstone?). Thin section is skeletal-peloidal grainstone including bryozoans, crinoid ossicles, brachiopods, and rare foraminifers. Peloids consistent in size (40-80 microns). Rare orange-brown micritic (dolomitic?) clasts; irregular shapes suggest deposition before complete lithification. Minor but notable disseminated siliceous sponge spicules (24-60 microns in diameter). (description from Dover et al., 2004, p. 35 (Table 1)); [Howard Pass C-3 quad. 68°35.41', 157°37.65'. Ipnavik Lisburne--Talus blocks!! from subcrop of very dark to brownish-gray very fine grained, muddy, turbiditic limestone (grainstone and carbonate mudstone?). Thin section is skeletal-peloidal grainstone including bryozoans, crinoid ossicles, brachiopods, and rare foraminifers. Peloids consists in size (40-80 microns). Rare orange-brown micritic (dolomitic?) clasts; irregular shapes suggest deposition before complete lithification. Minor but notable disseminated siliceous sponge spicules (24-60 microns in diameter). (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)] |
Location: |
Alaska Quadrangle: Howard Pass C-3 Lat.: 68o35.4 ' Long.: 157o37.7 ' |
|
|
Reference
|
|
|
Title: |
Report on Referred Fossils
,
1993
(09/17)
|
|
This report is long (1.5 years) overdue, but I have been exceedingly busy writing papers, responding to reviewers and editors comments and preparing talks. I am finally returning to a partial E&R mode and your collections were at the top of the list. |
Report by: |
Anita G. Harris
|
Referred by: |
Irv L. Tailleur
,
John S. Kelley
|
|
|
| Age: | Osagean (no older than late Osagean) |
Formation: | Lisburne Group |
CAI: | Min: 1.5 |
|
|
|
|
Comment: | Age: no older than late Osagean--the species association includes Late Devonian conodonts--the youngest elements in this collection could be of late Osagean or younger Mississippian age. Biofacies: Indeterminate. Thin section description by Julie A. Dumoulin. CAI = 1.5 Heavy mineral concentrate: weathered iron oxides and phosphatized argillaceous material containing scattered, very fine pyrite. |
|
|
|
|