Sample Detail of
Sample: Sample No. 91Tr32C -- USGS No. 31845-PC
Locality: Field No. 91Tr32C
Description: Howard Pass C-3. Lat. 68o 37' N., Lat. 157o 34.5' W. Vuggy, fine- to medium-grained dolomite, sample from two large blocks (possible subcrop) on shoulder of slope. Thin section is dolomite crystal mosaic containing rare siliceous sponge spicules and <1 percent brown mudstone clasts. (description from Dover et al., 2004, p. 34 (Table 1)); [Howard Pass C-3 quad. 68°37.00', 157°34.35'. Lisburne Group (Brooks Range allochthon); vuggy, fine- to medium-grained dolomite. Dolomite crystal mosaic containing rare siliceous sponge spicules and <1 percent brown mudstone clasts.
Sample from two large blocks from rubble on shoulder of slope. Sampled blocks are possibly subcrop. (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o37' " Long.: 157o34.5 '
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 (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 2
Comment:Age: latest Early-Late Mississippian; late Osagean to early Chesterian; if the form identified as rhachistognathid(?) is indeed a rhachistognathid, then the age could be restricted to late Meramecian to early Chesterian.

Biofacies: Indeterminate, but assemblage strongly suggests postmortem transport from or within the gnathodid biofacies; moderate- to deep-water depositional setting.

Shown as locality 33 on Sheet 2; map unit: Mlb

CAI=2

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 11 Pa element fragments Gnathodus texanus Roundy All conodonts identified by A.G. Harris
2 Conodonts 1 Pa element fragment of a rhachistognathid(?)
3 Conodonts 66 indet. bar, blade, and platform fragments

Title: Report on Referred Fossils ,  1993 (09/17)
This report is long (1.5 years) overdue, but I have been exceedingly busy writing papers, responding to reviewers and editors comments and preparing talks. I am finally returning to a partial E&R mode and your collections were at the top of the list.
Report by: Anita G. Harris
Referred by: Irv L. Tailleur , John S. Kelley
Age: Osagean-Chesterian (latest Osagean - early Chesterian)
Formation: Lisburne Group
CAI:Min: 2
Comment:Age: latest Osagean to early Chesterian; if the form identified as rhachistognathid(?) is indeed a rhachistognathid, then the age could be restricted to late Meramecian to early Chesterian. Biofacies: Indeterminate but assemblage strongly suggests postmorten transport from or within the gnathodid biofacies; moderate- to deep-water depositional setting.
Thin section description by Julie A. Dumoulin.
CAI = 2
Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 11 Pa element fragments Gnathodus texanus Roundy
2 Conodonts 1 Pa element fragment of a rhachistognathid(?)
3 Conodonts 66 indet. bar, blade, and platform fragments