Sample Detail of
Sample: Sample No. 91Tr36D -- USGS No. 31846-PC
Locality: Field No. 91Tr36D
Description: Howard Pass C-3. Lat. 68o 35.4' N., Long. 157o 37.7' W. Talus black from subcrop of very dark to brownish-gray, very fine grained, muddy, turbiditic limestone (grainstone and carbonate mudstone?). Thin section is skeletal-peloidal grainstone including bryozoans, crinoid ossicles, brachiopods, and rare foraminifers. Peloids consistent in size (40-80 microns). Rare orange-brown micritic (dolomitic?) clasts; irregular shapes suggest deposition before complete lithification. Minor but notable disseminated siliceous sponge spicules (24-60 microns in diameter). (description from Dover et al., 2004, p. 35 (Table 1)); [Howard Pass C-3 quad. 68°35.41', 157°37.65'. Ipnavik Lisburne--Talus blocks!! from subcrop of very dark to brownish-gray very fine grained, muddy, turbiditic limestone (grainstone and carbonate mudstone?). Thin section is skeletal-peloidal grainstone including bryozoans, crinoid ossicles, brachiopods, and rare foraminifers. Peloids consists in size (40-80 microns). Rare orange-brown micritic (dolomitic?) clasts; irregular shapes suggest deposition before complete lithification. Minor but notable disseminated siliceous sponge spicules (24-60 microns in diameter). (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o35.4 ' Long.: 157o37.7 '
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 (no older than late Osagean)
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1.5
Comment:Age: No older than late Early Mississippian (late Osagean); the species association includes Late Devonian conodonts, and the youngest elements in this collection could be of late Osagean or younger Mississippian age.

Biofacies: Indeterminate

Shown as locality 44 on Sheet 2; map unit: Mlri

CAI=1.5

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Pa element fragment of Bispathodus cf. B. utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 2 posterior Pa element fragments of a cavusgnathoid
3 Conodonts Idioprioniodus sp., 2 Pa, 2 Pb, and 2 Sa elements
4 Conodonts 62 indet. bar, blade, and platform fragments
5 Conodonts Redeposited Late Devonian conodonts: 1 mid Pa element fragment of Palmatolepis sp. indet.
6 Conodonts Redposited Late Devonian conodonts: 1 anterior Pa element fragment of Polygnathus sp. indet.

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 (no older than late Osagean)
Formation: Lisburne Group
CAI:Min: 1.5
Comment:Age: no older than late Osagean--the species association includes Late Devonian conodonts--the youngest elements in this collection could be of late Osagean or younger Mississippian age.
Biofacies: Indeterminate.
Thin section description by Julie A. Dumoulin.
CAI = 1.5

Heavy mineral concentrate: weathered iron oxides and phosphatized argillaceous material containing scattered, very fine pyrite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 Pa element fragment of Bispathodus cf. B. utahensis Sandberg and Gutschick
2 Conodonts 2 posterior Pa element fragments of a cavusgnathoid
3 Conodonts Idioprioniodus sp. 2 Pa, 2 Pb and 2 Sa slements
4 Conodonts 62 indet. bar, blade, and platform fragments
5 Conodonts REDEPOSITED LATE DEVONIAN CONODONTS:
6 Conodonts 1 mid Pa element fragment of Palmatolepis sp. indet.
7 Conodonts 1 anterior Pa element fragment of Polygnathus sp. indet.