Sample Detail of
Sample: Sample No. 92AD35C-15.5 -- USGS No. 32442-PC
Locality: Field No. 92AD35C-15.5
Description: Howard Pass B-3. Lat. 68o 20'00" N., Long. 157o 44'35" W. Sample from 80 x 45 cm concretion of fine-grained, sooty, fetid, black, medium-gray-weathering limestone (calcified radiolarite?). Thin section is calcareous radiolarian packstone; radiolarian tests (50-80 percent of slide; replaced and filled with polycrystalline calcite) and lesser calcareous sponge spicules in a matrix of brown, fine-crystalline calcite. Collected from 15.5 m above base of approx. 68 m-thick section of Kuna Formation at type locality (as designated in Mull and others, 1982); section is mostly silicified mudstone and <10 percent limestone. (description from Dover et al., 2004, p. 49 (Table 1));
[Howard Pass B-3. 68°20'00', 157°44'30". 80 x 40 cm concretion of fine-grained, sooty, fetid, black, medium gray-weathering limestone (calcified radiolarite?). Collected from 15.5 m above base ~68 m-thick type section of Kuna Fm. which is mostly silicified mudstone and <10% limestone.
Collected at ~800 m elevation, ~ 1/4 mile west of 92AD35A section on north side of small tributary to Safari Creek, ~1 mile southeast of hill 950 m and ~2.75 miles due west of headwaters of Ipnavik River, NW1/4 sec. 21, T. 34 N., R. 5 E. (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.: 68o20'00 " Long.: 157o44'35 "
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 (late Early Mississippian (middle Osagean))
Formation: Kuna Formation
CAI:Min: 3
Comment:Age: late Early Mississippian; Sc. anchoralis-Do. latus Zone (middle Osagean).

Biofacies: Scaliognathid; basinal depositional environment.

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 11.1 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa elements Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 2 Pa elements Gnathodus cuneiformis Mehl and Thomas
3 Conodonts 2 Pa elements Polygnathus communis communis Branson and Mehl
4 Conodonts Scaliognathus anchoralis Branson and Mehl, 30 M, 3 Sc, and 35 S element bar fragments
5 Conodonts 1 digyrate Pb element
6 Conodonts Unassigned elements: 20 Pb (+4 morphotypes), 5 Sa (2 morphotypes), 7 Sb (2 morphotypes), and 16 Sc (2 morphotypes)
7 Conodonts +130 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 (early middle Osagean)
Formation: Kuna Formation
Comment:Age: S. anchoralis-D. latus Zone (early middle Osagean)
Biofacies: Scaliognathid; basinal depositional environment.
CAI = ~3

11.1 kg or rock processed (320 g 0f +20 mesh and 116 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly argillaceous grains, and minor iron oxides., barite(?) and micas.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Organic matter invades or partly covers all conodonts, consequently CAI difficult to determine.
2 Conodonts 3 Pa elements Bispathodus utahensis Sandberg and Gutschick
3 Conodonts 35 bar fragments (moderately long to short) "Hindeodella" segaformis Bischoff s.f.
4 Conodonts 2 Pa elements Gnathodus cuneiformis Mehl and Thomas
5 Conodonts 2 Pa elements Polygnathus communis communis Branson and Mehl
6 Conodonts Scaliognathus anchoralis Branson and Mehl 30 M, 3 Sc elements
7 Conodonts 1 Digyrate Pb element
8 Conodonts UNASSIGNED ELEMENTS: 20 Pb (+4 morphotypes), 5 Sa (2 morphotypes), 7 Sb (2 morphotypes), and 16 Sc (2 morphotypes)
9 Conodonts +130 indet. bar, blade, and platform elements