Sample Detail of
Sample: Sample No. 92AD32A -- USGS No. 32432-PC
Locality: Field No. 92AD32A
Description: Howard Pass C-3. Lat. 68o 30'40" N., 157o 30'55" W. Buff-weathering, very fine-grained dolostone intercalated with black siliceous mudstone; uppermost part of unit Mlb. Stratigraphically above strata at loc. 71; equivalent to, or slightly stratigraphically below, strata at loc. 58. Thin section is fine-crystalline dolostone, with lenses of chert that contain siliceous sponge spicules and lesser radiolarians. (description from Dover et al., 2004, p. 43 (Table 1); [Howard Pass C-3. 68°30'40", 157°30'55". Buff-weathering, very fine-grained dolostone intercalated with black shale.
92AD32, 33, 49A, 47 from platformal facies of Lisburne Group at Mt. Bupto, ~1-2 miles east of headwaters of Bushy Creek and ~4 miles southwest of Rim Butte along west side of eastern half of Mount Bupto, western Brooks Range. 92AD32A collected from "Black Lisburne" facies, overlying (structurally and stratigraphically(?) rest of the samples (92AD33, 49, 47). Age of similar rocks at Ivotuk Hills is Chesterian (85ASi14-18).
Collected from the saddle at top of Mt. Bupto, between peak 159 m to the north and a peak 1220+ m to the southeast; N. part NE1/4 sec. 9, T. 11 S., R. 24 W. (description from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass C-3
Township&Range: 11 S. 24 W. Section: 9
Lat.: 68o30'40 " Long.: 157o30'55 "
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-Meramecian (late Early-early Late Mississippian (late Osagean - Meramecian))
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5
Comment:Age: late Early-early Late Mississippian; late Osagean (Po. mehli-Lower G. texanus Zone) through Meramecian.

Biofacies: Indeterminate (too few generically determinate conodonts)

Shown as locality 72 on Sheet 2; map unit: Mlb

CAI=1.5

Processed 6.4 kg of rock. All conodonts are partly to extensively coated with organic matter.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Pa element Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 4 Pa elements Gnathodus texanus Roundy
3 Conodonts 107 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-Meramecian (latest Osagean (G. texanus Zone) - Meramecian)
Formation: Lisburne Group
CAI:Min: 1.5
Comment:Age: latest Osagean (G. texanus Zone) through Meramecian.
Biofacies: Indeterminate (too few generically determinate conodonts). CAI = 1.5

6.4 kg of rock processed (480 g +20 mesh and 380 g 20-2000 mesh insoluble residue).
Heavy-mineral concentrate: chiefly phosphatized argillaceous grains and fluorite(?).

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts All conodonts are partly to extensively coated with organic grunge
2 Conodonts 1 Pa element Bispathodus utahensis Sandberg and Gutschick
3 Conodonts 4 Pa elements Gnathodus texanus Roundy
4 Conodonts 107 indet. bar, blade, and platform fragments