Sample Detail of
Sample: Sample No. 91Tr47E -- USGS No. 31852-PC
Locality: Field No. 91Tr47E
Description: Howard Pass C-3. North-south traverse through section of unit Mlb: 68o 30.6' N., 157o 32.45' W. (base, 47A) to 68o 30.5' N., 157o 32.45' W. (top, 47F). Sample from approx. 5 m of interbedded dolostone and chert. Chert, in beds as much as 25 cm thick, appears to be silicified encrinite; dolostone in undulous beds that locally contain wavy laminations. Thin section mostly dolostone (crystals 30-160 microns) with some relict, locally silicified bioclasts (bryozoans and possible crinoid ossicles and brachiopod fragments). Several layers of dark brown, noncalcareous mud rich in siliceous sponge spicules. Lithofacies and biofacies of these strata suggest correlation with 92AD33-91 (loc. 71). (description from Dover et al., 2004, p. 40 (Table 1)); [Howard Pass C-3 quad. 68°30.60', 157°32.45'. Lisburne Group (Brooks Range allochthon); ~5 m ribbony dolomite--chert as much as 10" thick, silicified encrinite, and lunpy dolomite containing wavy laminations. Thin section mostly dolostone (crystals 30-160 microns). Some silicified bryozoans, possible crinoid ossicles and brachiopod fragments, rare radiolarians(?). Several layers of dark brown, noncalcareous mud rich in siliceous songe spicules. (description from Harris E&R report dated Sept. 17, 1993; Shipment no. A-93-11)]
Location: Alaska Quadrangle: Howard Pass C-3
Lat.: 68o30.6 ' Long.: 157o32.45 '
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 (late Early Mississippian (middle to late Osagean))
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5 - Max: 2
Comment:Age: Early Mississippian; middle (Sc. anchoralis-Do. mehli-Lower G. texanus Zone) Osagean. Biofacies: Indeterminate (too few generically identifiable conodonts).

Shown as locality 69 on Sheet 2; map unit: Mlb

CAI=1.5-2

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 9 Pa element fragments Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 1 P element Eotaphrus burlingtonensis Pierce and Langenheim
3 Conodonts 2 Sb elements Synclydognathus geminus (Hinde)
4 Conodonts Unassigned elements: 7 Pb (3 morphotypes), 26 M (+3 morphotypes), 2 Sa, 1 Sb, and 18 Sc (2 morphotypes)
5 Conodonts 125 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 (middle (anchoralis-latus Zone) to late (lower texanus Zone) Osagean)
Formation: Lisburne Group
CAI:Min: 1.5 - Max: 2
Comment:Age: middle (anchoralis-latus Zone) to late (lower texanus Zone) Osagean. Biofacies: Indeterminate
Thin section description by Julie A. Dumoulin.
CAI = 1.5-2

Heavy-mineral concentrate: chiefly iron oxides and dolomite and minor conodont fragments.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 9 Pa element fragments Bispathodus utahensis Sandberg and Gutschick
2 Conodonts 1 P element Eotaphrus burlingtonensis Pierce and Langenheim
3 Conodonts 2 Sb element Synclydognathus geminus (Hinde)
4 Conodonts UNASSIGNED ELEMENTS: 7 (3 morphotypes), 26 M (+3 morphotypes), 2 Sa, 1 Sb, and 18 Sc (+3 morphotypes)
5 Conodonts 125 indet. bar, blade, and platform fragments