Sample Detail of
Sample: Sample No. 85ADn84A -- USGS No. 29802-PC
Locality: Field No. 85ADn84A
Description: Cliff of brownish-gray, medium crystalline, recrystallized limestone with 5-10 percent white spar fossil ghosts from 1/4 mi S of 85ADn82B, lat. 67o 49.6 min., long. 161o 55.8 min., Baird Mtns. D-6 quadrangle. Submitted as Kogruk Formation.
Location: Alaska Quadrangle: Baird Mts D-6
Lat.: 67o49.6 ' Long.: 161o55.8 '
Reference
Title: Report on Referred Fossils ,  1986 (03/04)
These samples were processed and picked for conodonts by Kitty Reed in Anchorage, Alaska.
Report by: Anita G. Harris , Katharine S. Schindler
Referred by: Julie A. Dumoulin , Susan M. Karl
Age: Early Mississippian
Formation: Kogruk Formation
CAI:Min: 3.5 (CAI=3-1/2 indicating host rock reached at least 150 deg. C.)
Comment:5.4 kg of rock was processed (412 g of +20 mesh and 100 g of 20-200 mesh insoluble residue).

This collection of conodonts is hydraulically broken. Some of the S elements are reminiscent of Osagean morphotypes, but can not be certain.

Age: Early Mississippian; (=possibly Kinderhookian if the Siphonodella fragments are not redeposited)
CAI=3-1/2 indicating host rock reached at least 150o C.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 5 Pa elements of Polygnathus communis Branson & Mehl
2 Conodonts 4 Pa element fragments of Pseudopolygnathus sp. indet.
3 Conodonts 3 Pa element fragments of Siphonodella sp. indet.
4 Conodonts 1 Pb element cf. Scaliognathus sp. indet.
5 Conodonts 3 M and 1 Sc elements
6 Conodonts 58 indet. bar, blade and platform fragments