Sample Detail of
Sample: Sample No. 83Mu25 -- USGS No. 29374-PC
Locality: Field No. 83Mu25
Description: White dolomite with minor chert from top of Lisburne at Shishakshinovik Pass, Lat. 67o 25.56 min., long. 156o 12.7 min., Ambler River quad.; submitted as Pennsylvanian.
Location: Alaska Quadrangle: Ambler River B-1
Lat.: 67o25.56 ' Long.: 156o12.7 '
Reference
Title: Report on Referred Fossils ,  1984 (11/01)
Report by: Anita G. Harris
Referred by: C. G. Mull
Age: Meramecian-Chesterian
Formation: Lisburne Group
CAI:Min: 5.5 - Max: 6.5 (CAI=5-1/2 to 6-1/2 indicating host rock reached at least 350-400 deg. C. These conodonts look hydrothermally altered or at least contact metamorphic (range in CAI's in the sample).)
Comment:6.72 kg of rock was processed (1.33 kg of +20 mesh insoluble residue).

Age: late Meramec-early Chester (middle Late Mississippian)
CAI=5-1/2 to 6-1/2 indicating host rock reached at least 350-400o C. These conodonts look hydrothermally altered or at least contact metamorphic (range in CAI's in the sample).

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Pa element of Gnathodus bilineatus (Roundy)
2 Conodonts 1 Pa element of Gnathodus texanus Roundy
3 Conodonts 1 indet. bar fragment