Sample Detail of
Sample: Sample No. 92AD33-61.5 -- USGS No. 32435-PC
Locality: Field No. 92AD33-61.5
Description: Howard Pass C-3. Measured section extends from 68o 30'40"/157o 31'00" (top) to 68o 30'32"/157o 31'34" (base). Sample from 50-cm-thick bed of dolostone immediately underlying chert that has crinoidal grainstone texture. Thin section is dolomite-crystal mosaic containing a few relict crinoid ossicles and having 50-10 percent chiefly intercrystalline porosity. Collected 61.5 m below top of measured section. (description from Dover et al., 2004, p. 42 (Table 1)).
[Howard Pass C-3. 68°30'43", 157°31.00". 50 cm-thick bed of dolostone immediately underlying chert with crinoidal grainstone texture.
Collected from 61.7 m below top of measured section.
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).

92AD33-0.2 to -120 from 1240 m and 1100 m elevation of continuously exposed chert and dolostone along trend with measured section of Gus Armstong (<0.25 mile due north), who suggested an age of Meramecian (based on silicified colonial corals and forams) for the upper 100 m (at least) of section (see Armstrong, AAPG Bulletin, v. 54, p. 251+, 1970); N part NE1/4 sec. 9, T. 11 S., R. 24 W, lat. 68°30'43" to 68°30'37", long. 157°31'00" to 20", Howard Pass C-3 quadrangle. (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.: 157o31'00 "
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: Osagean-Meramecian (late Early-early Late Mississippian (middle Osagean - Meramecian))
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5
Comment:Age: lae Early-early Late Mississippian (middle Osagean-Meramecian); based on constraints from under- and overlying collections.

Biofacies: Postmortem transport within or from the bispathodid-kladognathid biofacies; open-marine depositional environment.

Shown as locality 71 on Sheet 2; map unit: Mlb

CAI=1.5

Processed 7.7 kg of rock. Mostly broken conodonts--all the +60 mesh heavy-mineral concentrate was picked, but only part of the 60- to 100-mesh fraction was picked.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Bispathodus utahensis Sandberg and Gutschick, 7 Pa (all incomplete) and 1 Pb elements All conodonts identified by A.G. Harris
2 Conodonts 16 small Pa element fragments Bispathodus utahensis Sandberg and Gutschick?
3 Conodonts Kladognathus sp. indet., 3 P, 9 M, 2 Sa, and 11 Sb-Sc elements (all fragments)
4 Conodonts 41 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 (middle Osagean - Meramecian)
Formation: Lisburne Group
CAI:Min: 1.5
Comment:Age: middle Osagean-Meramecian (based on constraints from under- and overlying collections.
Biofacies: Postmortem transport within or from the bispathodid-kladognathid biofacies; open-marine depositional environment.
CAI = 1.5

7.7 kg of rock processed (160 g +20 mesh and 307 g 20-200 mesh insoluble residue).
Heavy-mineral concentrate: chiefly dolomite rhombs.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Mostly broken conodonts--all the +60 mesh heavy-mineral concentrate was picked, but only 40 trays of the 60-100 mesha fraction was picked
2 Conodonts Bispathodus utahensis Sandberg and Gutschick 7 Pa (all incomplete) and 1 Pb elements
3 Conodonts 16 small Pa element fragments Bispathodus utahensis Sandberg and Gutschick?
4 Conodonts Kladognathus sp. indet. 3 P, 9 M, 2 Sa, and 11 Sb-Sc elements (all fragments)
5 Conodonts 41 indet. bar, blade, and platform fragments