Sample Detail of
Sample: Sample No. 92AD26D -- USGS No. 32431-PC
Locality: Field No. 92AD26D
Description: Howard Pass B-5. Lat. 68o 29.6' N., Long. 158o 35.1' W. Probably turbidite; 10-cm-thick, paralle; and cross-laminated, light- to medium-gray-weathering (locally yellow-tan), dark-gray limestone intercalated with black mudstone and chert. Thin section is laminated spiculite that contains roughly equal amounts of calcareous and siliceous spicules. Collected approx. 1.5 m above base of outcrop and 15 m below mafic sill. Heavy-mineral concentrate: chiefly fused clusters of spines and (or) spicules with druses of phosphate. (description from Dover et al., 2004, p. 45 (Table 1)); [Howard Pass B-4. 68°29.57', 158°35.17'. Probable turbidite; 10 cm-thick, parallel and cross laminated, dark-gray, light to medium gray-weathering (locally yellow-tan) limestone intercalated with black mudstone and chert.
Collected as "Ipnavik facies" of Lisburne Group, ~1.5 m above base of outcrop and 15 m below mafic sill.
Collected ~4000 ft. (~ 1250 m) elevation on north side of hill 1301 m, ~1.5 miles due east of Wager Creek and ~0.5 mile west of headwaters of Twister Creek, NE1/4 sec. 13, T. 11 S., R. 29 W. (from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass B-5
Township&Range: 11 S. 29 W. Section: 13
Lat.: 68o29.6 ' Long.: 158o35.1 '
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: Osagean (Probably late Early Mississippian (Osagean))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 3.5 - Max: 4
Comment:Age: Probably late Early Mississippian (Osagean).

Biofacies: Indeterminate (too few conodonts)

Shown as locality 75 on Sheet 2; map unit: Mlri

CAI=3.5-4

Processed 7.3 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 2 Pb and 1 Sc elements Bactrognathus? sp. indet. All conodonts identified by A.G. Harris
2 Conodonts 3 Pa elements Hindeodus crassidentatus (Branson and Mehl)
3 Conodonts 1 unassigned Sc element
4 Conodonts 23 indet. bar, blade, and platform elements

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 (probably Osagean)
Formation: Lisburne Group ("Ipnavik facies" of the Lisburne Group)
Comment:Age: probably Osagean

7.3 kg rock processed (1240 g +20 mesh and 145 g 20-100 mesh insoluble residue).
Heavy-mineral concentrate: chiefly fused clusters of spines and/or spicules with druses of phosphate, iron oxides, pyrite and minor chloritic(?) minerals.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 2 Pb and 1 Sc elements Bactrognathus? sp. indet.
2 Conodonts 3 Pa element Hindeodus crassidentatus (Branson and Mehl)
3 Conodonts 1 unassigned Sc element
4 Conodonts 23 indet. bar, blade, and platform fragments