Sample Detail of
Sample: Sample No. 91Tr50.1
Locality: Field No. 91Tr50.1
Description: Howard Pass C-3. Lat. 68o 32.4' N., Long. 157o 28.9' N. Carbonate talus block. Thin section is a breccia; matrix is clear, relatively coarse-grained anhedral calcite that has undulatory extinction. "Clasts" include brown, noncalcareous mudstone, dark, clotty micrite, crinoid ossicles, dolostone, and chert. Some fo the micrite clasts contain chalcedony-filled radiolarians and siliceous sponge spicules (240 and 60 microns in diameter, respectively). If fauna is not reworked, this sample and that from locality 24 are the oldest recovered from the unit Mlri. (description from Dover et al., 2004, p. 35 (Table 1)); [Howard Pass C-3 quad. 68°32.39', 157°28.9'. Ipnavik Lisburne(?) (block of strange limestone). Thin section is a breccia--matrix is clear, relatively coarse-grained anhedral calcite with sweeping extinction. "Clasts" include brown, noncalcareous mudstone, dark, clotty micrite, crinoid ossicles, dolostone, and chert. Some of the micrite clasts contain chalcedony-filled radiolarians (240 microns) and siliceous sponge spicules (60 microns). (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o32.4 ' Long.: 157o28.9 '
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: Middle Devonian-Kinderhookian
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1.5
Comment:Age: Middle Devonian-early Early Mississippian (Kinderhookian)

Biofacies: Indeterminate

Shown as locality 52 on Sheet 2; map unit Mlri

CAI=1.5

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa element fragments of Polygnathus sp. indet. of Middle Devonian to Kinderhookian morphotype (specimens corroded) All conodonts identified by A.G. Harris
2 Conodonts 1 indet. bar fragment

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: Middle Devonian-Kinderhookian (Middle Devonian - early Early Mississippian (Kinderhookian))
Formation: Lisburne Group (Ipnavik Lisburne Group?)
CAI:Min: 1.5
Comment:Age: Middle Devonian-early Early Mississippian (Kinderhookian)
Biofacies: Indeterminate
Thin section description by Julie A. Dumoulin.
CAI = 1.5

Heavy-mineral concentrate not retained.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa element fragments of Polygnathus sp. indet. of Middle Devonian to Kinderhookian morphotype (specimens corroded)
2 Conodonts 1 indet. bar fragment