Sample Detail of
Sample: Sample No. 92AD52A -- USGS No. 32448-PC
Locality: Field No. 92AD52A
Description: Howard Pass C-5. Lat. 68o 43'55" N., Long. 158o 55'00" W. Very fine grained, medium- to medium-dark-gray limestone containing fine-grained skeletal pack/grainstone; bioclasts mostly (80 percent) calcareous sponge spicules (to 3 mm long). Other grains include bryozoan, brachiopod and crinoid fragments, ostracode valves, and rounded clasts of noncalcareous mudstone. Collected from approx. 10 m below rubble of mafic igneous sill, stratigraphically above(?) 92AD50C (loc. 2). (description from Dover et al., 2004, p. 30 (Table 1)); [Howard Pass C-5. 68°43'55", 158°55'00". Very fine-grained, medium- to medium dark-gray limestone with fine-grained skeletal debris.
Collected from ~ 10 m below rubble of mafic igneous sill, stratigraphically above(?) 92AD50C.
Collected at ~600 m elevation, ~1 mile south (and slightly east) of sample 92AD50C and ~1 mile due west of Jubilee Creek; NE1/4SE1/4 sec. 24, T. 8 S., R. 30 W. (description from Harris E&R report dated March 17, 1995, Shipment no. A-95-3)]
Location: Alaska Quadrangle: Howard Pass C-5
Township&Range: 8 S. 30 W. Section: 24
Lat.: 68o43'55 " Long.: 158o55'00 "
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 (No older than middle Osagean)
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1.5 - Max: 2
Comment:Age: No older than late Early Mississippian; Sc. anchoralis-Do. latus Zone (middle Osagean) along with redeposited Kinderhookian conodonts. This species association and mixture of biofacies and ages is characteristic of the Rim Butte unit.

Biofacies: Mixed biofacies and age; outer shelf or deeper water depositional setting, probably a turbidite.

Shown as locality 3 on Sheet 2; map unit: Mlri

CAI=1.5-2

Processed 11.2 kg of rock

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 57 Pa elements Bispathodus utahensis Sandberg and Gutschick? all conodonts identified by A.G. Harris
2 Conodonts 7 "Hindeodella" segaformis Bischoff s.f. bar fragments
3 Conodonts Idioprioniodus conjunctus (Gunnell), 2 Pa, 6 Pb, 5 M, 2 Sa, and 8 Sb-Sc elements
4 Conodonts Kladognathus sp., 6 P, 12 M, 6 Sa, and 20 Sb-Sc elements
5 Conodonts 20 Pa elements Polygnathus communis Branson and Mehl
6 Conodonts 1 Scaliognathus praeanchoralis Lane, Sandberg, and Ziegler? fragment
7 Conodonts 20 indet. bar, blade, and platform fragments
8 Conodonts Siphonodella sp. indet., 4 juvenile Pa and 2 Pb elements Redeposited late Kinderhookian conodonts
9 Conodonts Unassigned elements: 6 Pb (3 morphotypes), 11 M (3 morphotypes), and 3 Sc (3 morphotypes)

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 (no older than middle Osagean)
Formation: Lisburne Group
CAI:Min: 1.5 - Max: 2
Comment:Age: No older than Scaliognathus anchoralis-Doliognathus latus Zone (middle Osagean) with redeposited Kinderhookian conodonts. This species association and mixture of biofacies and ages is characteristic of the Rim Butte unit (Ipnavik allochthon).
Biofacies: Mixed biofacies and age; outer shelf or deeper water depositional setting, probably a turbidite.

11.2 kg or rock processed (720 g of +20 mesh and 119 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly unpicked conodont fragments, ferruginous spines and spicules and phosphatized composite grains.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 57 Pa elements Bispathodus utahensis Sandberg and Gutschick?
2 Conodonts 7 "Hindeodella" segaformis Bischoff s.f. bar fragment
3 Conodonts Idioprioniodus conjunctus (Gunnell) 2 Pa, 6 Pb, 5 M, 2 Sa, and 8 Sb-Sc elements
4 Conodonts Kladognathus sp. 6 P, 12 M, 6 Sa, and 20 Sb-Sc elements
5 Conodonts 20 Pa elements Polygnathus communis Branson and Mehl
6 Conodonts 1 Scaliognathus praeanchoralis Lane, Sandberg, and Ziegler? fragment
7 Conodonts REDEPOSITED LATE KINDERHOOKIAN CONODONTS:
8 Conodonts Siphonodella sp. indet. 4 juvenile Pa and 2 Pb elements
9 Conodonts UNASSIGNED ELEMENTS: 6 Pb (3 morphotypes), 11 M (3 morphotypes), and 3 Sc (3 morphotypes)