Sample Detail of
Sample: Sample No. 91Tr40A
Locality: Field No. 91Tr40A
Description: Howard Pass C-3. Lat. 68o 31.2' N., Long. 157o 30.1' W. Sample from upper part of unit Mlb; approx. 25 m below scarp of massive brecciated cherts. From approx. 1-ft-thick layer of carbonate within platy mudstone. Grayish-black, grayish-buff-weathering, partly laminated, carbonaceous dolostone. Thin section is carbonaceous dolomite crystal mosaic. Rocks at about this stratigraphic horizon but a few hundred meters northeast (90AD54; 90JS16) include black, very fine-grained, petroliferous , and phosphatic carbonate. Chert overlying carbonate at this locality contains Paleozoic (possibly Permian) radiolarians (table 2). (description from Dover et al., 2008, p. 36 (Table 1)); [Howard Pass C-3 quad. 68°31.23', 157°30.15'. Kuna Formation (Brooks Range allochthon); ~25 m below scarp of massive brecciated cherts. ~1 ft layer of calcareous silt to limestone within platy mudstone (cf. 91Tr05B). Grayish-black, grayish-buff-weathering, partly laminated, carbonaceous limestone. Thin section shows "Kuna-type" dolomite crystal mosaic. (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o31.2 ' Long.: 157o30.1 '
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: Devonian-Mississippian (Devonian - Mississippian, probably Mississippian)
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5 - Max: 2
Comment:Age: Devonian to Mississippian, probably Mississippian

Biofacies: Indeterminate

Shown as locality 58 on Sheet 2; map unit: Mlb

CAI=1.5 or 2

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 unassigned Pb element of Devonian and Mississippian morphotype All conodonts identified by A.G. Harris
2 Conodonts 19 indet. bar, blade, and platform fragments; all specimens badly borken and part to substrantially covered with organic matter

Title: Report on Referred Fossils ,  1993 (09/17)
This report is long (1.5 years) overdue, but I have been exceedingly busy writing papers, responding to reviewers and editors comments and preparing talks. I am finally returning to a partial E&R mode and your collections were at the top of the list.
Report by: Anita G. Harris
Referred by: Irv L. Tailleur , John S. Kelley
Age: Devonian-Mississippian (Devonian - Mississippian, probably Mississippian)
Formation: Kuna Formation
CAI:Min: 1.5 - Max: 2
Comment:Age: Devonian to Mississippian, probably Mississippian.
Biofacies: Indeterminate
Thin section description by Julie A. Dumoulin.
CAI = 1.5 or 2

Heavy-mineral concentrate: weathered iron oxides and phosphatized argillaceous material containing scattered, very fine pyrite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 unassigned Pb element of Devonian and Mississippian morphotype
2 Conodonts 19 indet. bar, blade, and platform fragments; all specimens badly broken and partly to substantially covered with organic grunge