Sample Detail of
Sample: Sample No. 83ADn34M -- USGS No. 10892-SD
Locality: Field No. 83ADn34M
Description: Cobble in Cretaceous conglomerate. Light gray dolomite with silicified bryozoans. Bendeleben A-1, T. 5 S., R. 16 W., sec. 12; 65o 4 min., 162o 1 min. 1/2 mile west of Salmon Creek, 4 miles east of Admiral Creek, elevation 970 ft. Sample consists of eight individual (some broken) cobbles from a carbonate cobble conglomerate of Cretaceous(?) age. (description from Karklins, 1984 E&R report) [Harris & Reed, 1984 E&R report provide following description: "Field nos. prefixed with 83ADn34 are all clasts from a carbonate-cobble conglomerate of Cretaceous(?) age from an outcrop about 1/2 mile west of Salmon Creek and about 4 miles east of Admiral Creek at elevation 970 feet, sec. 12, T. 5 S., R. 16 W., lat. 65o 04 min., long. 162o 01 min., Bendeleben A-1 quadrangle. 83ADn34M: Light-gray dolomite with whitish silicified corals."]
Location: Alaska Quadrangle: Bendeleben A-1
Township&Range: T5S R16W Section: Sec.12
Lat.: 65o04' " Long.: 162o01' "
Reference
Title: Report on Referred Fossils ,  1984 (03/29)
Report by: O. L. Karklins
Referred by: Julie A. Dumoulin
Age: No Data
Comment:Bryozoans are completed silicified, as noted in the field, and cannot be identified. The general shape of the colonies (zoaria) and the arrangement of zooecia is indicative of trepostome bryozoans. If they are trepostomes, a Paleozoic age is suggested for cobbles in this sample.
Occurrence(s)
No. Group Name Qty Notes
1 Bryozoans Bryozoans completely silicified, cannot be identified

Title: Report on Referred Fossils ,  1984 (03/06)
Only five samples remain undone from your shipment; these are all in Anchorage awaiting your processing (83ADn002, 83ADn34I, 83ADn34J, 83ADn34N and 83ATi227). The 20-200 mesh heavy-mineral separates are being returned to you for your disposal.
Report by: Anita G. Harris , Katherine M. Reed
Referred by: Julie A. Dumoulin , Allison Till
Age: Middle Ordovician-Middle Devonian
CAI:Min: 5.5
Comment:1.3 kg of rock was processed (588 g of +20 mesh and 25 g of 20-200 mesh insoluble residue)

AGE: Middle Ordovician through Middle Devonian
CAI=5-1/2 indicating host rock reached 350o C.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Panderodus sp.
2 Conodonts 1 conodont fragment of indeterminate morphotype

Title: Report on Referred Fossils ,  1984 (04/08)
Report by: Anita G. Harris , Katherine M. Reed , Julie A. Dumoulin
Referred by: Allison Till , Julie A. Dumoulin
Age: Early Devonian-Middle Devonian
CAI:Min: 5.5
Comment:0.72 kg of rock was processed (420 g of +20 mesh and 32 g of 20-200 mesh insoluble residue)

1.3 kg of this clast was run previously and reported on in A-83-42c. The addition of a representative of NEOPANDERODUS to the collection now restricts the age of the clast to the Early through Middle Devonian.

AGE: Early-Middle Devonian
CAI=5-1/2 indicating host rock reached about 350o C.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Neopanderodus sp. element
2 Conodonts 1 Panderodus sp. fragment