Sample Detail of
Sample: Sample No. 92AD20-4.5 -- USGS No. 32425-PC
Locality: Field No. 92AD20-4.5
Description: Howard Pass C-3. Lat. 68o 38'10" N., Long. 157o 31'40" W. Platy, dark-brownish-gray, grayish-orange-weathering, fine-grained limestone riddled with tiny burrows; about 4.5 m below top of 42-m-thick section of unit Mlri. Thin section is spiculite; spicules chiefly siliceous (some calcareous) in a fine-grained carbonate matrix containing muddy wisps and burrow fills and minor radiolarians. Sample collected from very fine grained rock (periplatform ooze?) and may contain relatively indigenous faunas. (description from Dover et al., 2004, p. 32 (Table 1)); [Howard Pass C-3. 68°38'10", 157°31'30". Platey, dark-brownish gray, grayish orange-weathering, fine-grained limestone riddled with tiny burrow.
Sample collected from very fine-grained lithology (periplatform ooze?) and may contain more indigenous faunas.
92AD20-4.5 through 92AD22A from 66.5+m thick measured section in sequence of "Ipnavik facies" of Lisburne Group overlain (unconformably?) by Cretaceous sandstone. The section may be cut by faults, but if is not repeated, 92AD20-4.5 should be the youngest, and 92AD22A should be the oldest. ....92AD20-4.5 and -14.5 collected above change in attitude (fault?)
92AD20-4.5,-14.5 and 92AD220-23 collected from -700-660 m elevation on west side of NW-trending ridge, ~2 miles due east of Cutaway Creek and ~2.5 miles due south of headwaters of Lost Temper Creek, western Brooks Range; SW1/4NE1/4 sec. 28, T. 9 S., R. 24 W. (description from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass C-3
Township&Range: 9 S. 24 W. Section: 28
Lat.: 68o38'10 " Long.: 157o31'40 "
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-Chesterian (late Osagean - early Chesterian (latest Early-Late Mississippian))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1
Comment:Age: latest Early-Late Mississippian; late Osagean (Po. mehli-Lower G. texanus Zone)-early Chesterian.

Biofacies: Indeterminate (too few conodonts); normal-marine depositional environment.

Shown as locality 27 on Plate 2; map unit: Mlri

CAI=1

Processed 8.5 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 juvenile Pa element Gnathodus texanus Roundy? All conodonts identified by A.G. Harris
2 Conodonts 1 unassigned Pb element
3 Conodonts 4 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-Chesterian (latest Osagean (G. texanus Zone) - early Chesterian)
Formation: Lisburne Group ("Ipnavid facies" of the Lisburne Group)
CAI:Min: 1
Comment:Age: latest Osagean (G. texanus Zone)-early Chesterian
Biofacies: Indeterminate (too few conodonts); normal-marine depositional environment.
CAI 1

8.5 kg rock processed 3480 g +20 mesh and 173 g 20-200 mesh insoluble residue).
Heavy-mineral concentrate: chiefly fresh and weathered pyrite shards and euhedral pyrite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 juvenile Pa element Gnathodus texanus Roundy?
2 Conodonts 1 unassigned Pb element
3 Conodonts 4 indet. bar, blade, and platform fragments