Sample Detail of
Sample: Sample No. 92AD214-1.5 -- USGS No. 32463-PC
Locality: Field No. 92AD214-1.5
Description: Howard Pass B-5. Lat. 68o 23'10" N., Long. 158o 54'00" W. Samples at this locality from approx. 85-m-thick measured section of unit Mlri. Section consists of interbedded limestone turbidites and shale (0-47 m), mostly shale (47-60 m), and mostly chert (60-85 m). Turbidites here are similar to those in the Mlri unit in the Howard Pass C-3 quadrangle, 30 mi to the east, but background sediment here is more shaly and less cherty than to the east. Sample 92AD214-1.5 is from 1.5 m above base of section. Sample is fine-grained limestone; 8-cm-thick, parallel- and cross-laminated turbidite that has a scoured base and contains disseminated pyrite. Thin section is very fine-grained, cross-bedded, calcite-cemented quartz-carbonate sandstone. Quartz grains (20-50 percent of slide) are angular, chiefly 40-90 microns in diameter. Carbonate clasts include crinoid ossicles and sponge spicules. (description from Dover et al., 2004, p. 46 (Table 1)); [Howard Pass B-5. 68°23'13", 158°54'40". Fine-grained limestone containing 8-cm-thick, parallel- and cross-laminated turbidites with scoured base and disseminated pyrite. Collected as Osagean "Ipnavik facies" of the Lisburne Group. "Ipnavik facies" in the Howard Pass C-3 quadrangle, 30 miles to the east, are mostly (all?) middle Osagean and the "turbidites" have similar lithology in both areas, but background sediment here is more shaly and less cherty than to the east. 92AD214-1.5 is 1.5 m above base of section.
Collected at stream bank section on southwest side of Buccaneer Creek, 2 1/4 mile due west of Primus Creek and ~2 miles north of junction of Primus and Buccaneer creeks, northwest area; center sec. 22, T. 12 S., R. 30 W. (description from Harris E&R report dated March 17, 1995; shipment no. A-95-3)]
Location: Alaska Quadrangle: Howard Pass B-5
Township&Range: 12 S. 30 W, Section: 22
Lat.: 68o23'10 " Long.: 158o54'00 "
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: Kinderhookian-Osagean (late Early Mississippian (late Kinderhookian - middle Osagean))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 2.5
Comment:Age: late Early Mississippian; late Kinderhookian-middle Osagean on the basis of conodonts in this and in overlying sample 92AD214-18.5.

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

Shown as locality 89 on Sheet 2; map unit: Mlri

CAI=2.5

Processed 7.3 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 juvenile Pa element Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 4 indet. bar 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 (late Kinderhookian-Meramecian, but early-middle Osagean as this sample is 17 m below 92AD214-18.5)
Formation: Lisburne Group
CAI:Min: 2.5
Comment:Age: late Kinderhookian-Meramecian, but early-middle Osagean as this sample is 17 m below 92AD214-18.5.
Biofacies: Indeterminate (too few conodonts); probably normal-marine depositional environment.
CAI = 2.5

7.3 kg of rock processed (2880 g of +20 mesh and 251 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly pyrite and dolomite(?) composite grains and ferruginous argillaceous flakes.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 juvenile Pa element Bispathodus utahensis Sandberg and Gutschick
2 Conodonts 4 indet. bar fragments