Sample Detail of
Sample: Sample No. 92AD35C-62 -- USGS No. 31782-PC
Locality: Field No. 92AD35C-62
Description: Howard Pass B-3. Lat. 68o 20'02" N., Long. 157o 44'32" W. Fine-grained, dark-gray to black, locally burrowed(?) limestone rubble (possible concretion). Thin section is dark, very fine grained carbonate containing rare, calcite-replaced radiolarians and locally abundant brown clasts of noncalcareous mud. Collected 62 m above base of section and 46.5 m above 92AD35C-15.5; [Howard Pass B-3. 68°20'02", 157°44'32". Fine-grained, dark-gray to black, locally burrowed(?) limestone rubble (possible concretion?).
Collected 62 m above base of section and 46.5 m above 92AD35C-15.5.
From same locality as above ("referring to 92AD35C-15.5"). (description from Harris E&R report dated March 17, 1995)].
Location: Alaska Quadrangle: Howard Pass B-3
Township&Range: 34 N. 5 E. Section: 21
Lat.: 68o20'02 " Long.: 157o44'32 "
Reference
Title: Geologic and fossil locality maps of the west-central part of the Howard Pass Quadangle and part of the adjacent Misheguk Mountains Quadrangle, western Brooks Range, Alaska ,  2004
Report by: Jim Dover , Irv L. Tailleur , Julie A. Dumoulin
Age: Osagean-Meramecian (late Early-early Late Mississippian (late middle Osagean - Meramecian))
Formation: Kuna Formation
CAI:Min: 3
Comment:Age: late Early-early Late Mississippian (late middle Osagean-Meramecian)

Biofacies: Indeterminate (too few conodonts); conodonts suggest basin facies.

Shown as locality 146 on Sheet 2; map unit: lPMk

CAI= approx. 3. Organic matter invades or partly covers all conodonts; consequently CAI difficult to determine.

Processed 8.7 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Bispathodus utahensis Sandberg and Gutschick, 9 Pa, 1 Pb, 1 M, and 1 Sc elements All conodonts identified by A.G. Harris
2 Conodonts 1 Pa element Gnathodus pseudosemiglaber Thompson and Fellows (figured in Dumoulin and others, 1994, fig. 3H)
3 Conodonts 68 indet. bar, blade, and platform fragments

Title: Report on Referred Fossils ,  1995 (03/17)
Analysis of all samples is given in the accompanying 16-page table. The range of biostratigraphically important samples is shown on the accompanying diagram. The heavy-mineral concentrates were analyzed by Nancy Stamm; the residues have been returned to Julie Dumoulin. Please note a few (~4 samples have heavy-mineral concentrates that include chalcopyrite and bornite).
Report by: Anita G. Harris
Referred by: Julie A. Dumoulin , J. H. Dover
Age: Osagean-Meramecian (late middle Osagean - Meramecian)
Formation: Kuna Formation
Comment:Age: late middle Osagean-Meramecian
Biofacies: Indeterminate (too few conodonts); conodonts suggest basin facies.
CAI = ~3.
REFERENCE:
Dumoulin, J.A., and Harris, A.G., 1993, Lithofacies and conodonts of Carboniferous strata in the Ivotuk Hills, western Brooks Range, Alaska, in Dusel-Bacon, Cynthia, and Till, A.B., eds., Geologic studies in Alaska by the U.S. Geological Survey, 1992: U.S. Geological Survey Bulletin 2068, p. 31-48.

8.7 kg of rock processed (540 g of +20 mesh and 65 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly phosphatized argillaceous grains and minor iron oxides.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Organic material invades or partly covers all conodonts, consequently CAI difficult to determine.
2 Conodonts Bispathodus utahensis Sandberg and Gutschick 9 Pa, 1 Pb, 1 M, and 1 Sc elements
3 Conodonts 1 Pa element Gnathodus pseudosemiglaber Thompson and Fellows (figured in Dumoulin and Harris, 1993, fig. 3H)
4 Conodonts 68 indet. bar, blade, and platform elements