Sample Detail of
Sample: Sample No. 91Tr47C -- USGS No. 31849-PC
Locality: Field No. 91Tr47C
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. 15-m-thick ribbed outcrop consisting chiefly of grayish-black chert in 5- to 10-cm-thick beds; locally abundant lenses of very fine grained, medium-brownish-gray, medium-buff-weathering dolostone within chert. Thin section is skeletal supportstone. Most of slide is silicified; one end is dolomitized. Relict skeletal grains include bryozoans, crinoid ossicles, ostracodes and minor siliceous sponge spicules. Heavy-mineral concentrate includes phosphatic brachiopod fragments. (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); from ~ 15 m ribbed outcrop consisting of 2 m of 2"-8" bedded grayish-black chert at bottom, 5 m similar material but slightly thinned bedded and upper 2 m is dolomite within chert. Thin section is skeletal supportstone. Most of slide is silicified; one end is dolomitized. Relict skeletals include bryozoans, crinoid ossicles, ostracodes and minor siliceous sponge 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 (Osagean))
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5 - Max: 2
Comment:Age: late Early Mississippian (Osagean)

Biofacies: Bispathodid biofacies; normal-marine, outer shelf to basin depositional environment.

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

CAI=1.5-2

Only +60-mesh fraction picked.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 46 Pa elements (all incomplete) Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts Idioprioniodus sp., 2 Pb, 3 Sa, and 8 Sc elements
3 Conodonts 1 Pa element fragment Pseudopolygnathus sp.
4 Conodonts Unassigned elements: 2 Pb, 65 M (+4 morphotypes), 5 Sa, and 10 Sc (2 morphotypes)
5 Conodonts 94 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
Formation: Lisburne Group
CAI:Min: 1.5 - Max: 2
Comment:Age: Osagean
Biofacies: Bispathodid biofacies; normal-marine, outer shelf to basin depositional environment.
Thin section description by Julie A. Dumoulin.
CAI = 1.5-2

Heavy-mineral concentrate: chiefly conodont fragments, iron oxides, phosphatic brachiopod fragments, and dolomite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 46 Pa elements (all incomplete) Bispathodus utahensis Sandberg and Gutschick
2 Conodonts Idioprioniodus sp. 2 Pb, 3 Sa, and 6 Sc elements
3 Conodonts 1 Pa element fragment Pseudopolygnathus sp.
4 Conodonts UNASSIGNED ELEMENTS: 2 Pb, 65 M (+4 morphotypes), 5 Sa, and 10 Sc (2 morphotypes)
5 Conodonts 94 indet. bar, blade, and platform fragments