Sample Detail of
Sample: Sample No. 92AD35A-9A -- USGS No. 31781-PC
Locality: Field No. 92AD35A-9A
Description: Howard Pass B-3. Lat. 68o 19'15" N., Long. 157o 44'10" W. Sample from 40 x 90-cm concretion of black limestone (calcitized radiolarite?) in fissile black shale. Thin section is calcareous radiolarian packstone; radiolarian tests (replaced and filled with calcite), lesser calcareous sponge spicules, and locally abundant brown clasts of mud and phosphate in a matrix of brown mud. Radiolarians and spicules make up approx. 70-80 percent of slide. Collected 9 m above base of 25-m-thick partial section (92AD35A) of Kuna Formation at type locality. Some conodonts from this sample are figured and described in Dumoulin and others (1994, fig. 3C-G). (description from Dover et al., 2004, p. 50 (Table 1));
[Howard Pass B-3. 68°12'30", 157°44'10". 40 x 90 cm concretion of black limestone in fissile black shale (calcitized radiolarite?). Collected 9 m above base of 35AA measured section at type Kuna Fm. section.
Some conodont from this sample are described in Dumoulin and Harris (1993).
From same locality as above ("referring to 92AD35AA"). (description from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass B-3
Township&Range: 34 N. 25 W. Section: 21
Lat.: 68o19'15 " Long.: 157o44'10 "
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 (early middle Osagean))
Formation: Kuna Formation
CAI:Min: 3
Comment:Age: late Early Mississippian; lowewr part of Sc. anchoralis-Do. latus Zone (early middle Osagean)

Biofacies: Scaliognathid; basinal depositional environment

Shown as locality 147 on Sheet 2; map unit: lPMk

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

Processed 10.5 kg of rock. Collection extremely abundant, only partly picked.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Bispathodus utahensis Sandberg and Gutschick, 6 Pa, 3 Pb, and 1 M elements All conodonts identified by A.G. Harris
2 Conodonts 3 Pa elements Doliognathus latus Branson and Mehl morphotype 3
3 Conodonts 2 Pa elements Gnathodus sp. indet.
4 Conodonts 9 Pa elements Polygnathus communis communis Branson and Mehl
5 Conodonts 1 Pa element Protognathodus cordiformis Lane, Sandberg, and Ziegler
6 Conodonts Scaliognathus anchoralis Branson and Mehl, 4 Pa, 54 M, and 174 Sa, Sb, and Sc (moderate to very long bar fragments) elements
7 Conodonts Unassigned elements: 69 Pb (+4 morphotypes), 2 Sb, and 1 Sc
8 Conodonts 22 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: Lower S. anchoralis-D. latus Zone (early middle Osagean)
Biofacies: Scaliognathis; basinal depositional environment.
CAI = ~3.
REFERENCE CITED:
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.

10.5 kg of rock processed (120 g of +20 mesh and 165 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly unpicked conodonts covered with organic matter and minor phosphatized bioclasts.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Organic matter invades or partly covers all conodonts, consequently CAI difficult to determine. Collection extremely abundant, only partly picked.
2 Conodonts Bispathodus utahensis Sandberg and Gutschick 6 Pa, 3 Pb, 1 M
3 Conodonts 3 Pa elements Doliognathus latus Branson and Mehl morphotype 3
4 Conodonts 2 Gnathodus sp. indet.
5 Conodonts 9 Pa elements Polygnathus communis communis Branson and Mehl
6 Conodonts 1 Pa element Protognathodus cordiformis Lane, Sandberg, and Ziegler
7 Conodonts Scaliognathus anchoralis Branson and Mehl 4 Pa, 54 M elements
8 Conodonts 174 (moderate to very long bar fragments--Sa, Sb and Sc elements) "Hindeodella" segaformis Bischoff s.f. These probably belong to Scaliognathus anchoralis.
9 Conodonts UNASSIGNED ELEMENTS: 69 Pb (+4 morphotypes), 2 Sb and 1 Sc
10 Conodonts 22 indet. bar, blade, and platform fragments