Sample Detail of
Sample: Sample No. 92ARm37B -- USGS No. 32471-PC
Locality: Field No. 92ARm37B
Description: Howard Pass B-5. Lat. 68o 23'30" N., Long. 158o 48'55" W. Light-gray limestone interbedded with black and gray chert. Heavy-mineral concentrate includes phosphatized composite grains and bioclasts and phosphatic brachiopod fragments. (description from Dover et al., 2004, p. 47 (Table 1)); [Howard Pass B-5. 68°23'32", 158°48'55". Light-gray limestone interbedded with black and grey chert. Submitted as Ipnavik facies of the Lisburne(?) Group.
Collected at -480 m elevation, -1/3 mile west of Primus Creek, and -3/4 mile north (and slightly east) of 92ARM31C; NW1/4 NW1/4 sec. 24, T. 12 S., R. 30 W. (description from Harris E&R report dated March 17, 1995; shipment no. A-95-3)]
Location: Alaska Quadrangle: Howard Pass B-5
Township&Range: 12 S. 30 W. Section: 24
Lat.: 68o23'30 " Long.: 158o48'55 "
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 Missississippian (middle Osagean))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 3
Comment:Age: late Early Mississippian; Sc. anchoralis-Do. latus Zone (middle Osagean).

Biofacies: Bispathodid-gnathodid; outer platform to upper slope depositional environment.

Shown as locality 91 on Sheet 2; map unit: Mlri

CAI=3

Processed 5.5 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 20 Pa elements Bispathodus utahensis Sandberg and Gutschick All conodonts identified by A.G. Harris
2 Conodonts 1 Pa element Geniculatus claviger Hass
3 Conodonts 11 Pa elements (all growth stages) Gnathodus semiglaber (Bischoff)
4 Conodonts 1 small bar fragment "Hindeodella" segaformis Bischoff s.f.
5 Conodonts 5 Idioprioniodus sp. indet. element fragments
6 Conodonts 1 juvenile Pa element Pseudopolygnathus sp.
7 Conodonts Unassigned elements: 2 M and 1 Sc
8 Conodonts 110 indet. bar, blade, and platform fragments

Title: Report on Referred Fossils ,  1995 (03/17)
Analysis of all samples is given in the accompanying 16-page table. The range of biostratigraphically important samples is shown on the accompanying diagram. The heavy-mineral concentrates were analyzed by Nancy Stamm; the residues have been returned to Julie Dumoulin. Please note a few (~4 samples have heavy-mineral concentrates that include chalcopyrite and bornite).
Report by: Anita G. Harris
Referred by: Julie A. Dumoulin , J. H. Dover
Age: Osagean (middle Osagean)
Formation: Lisburne Group (Ipnavik facies of the Lisburne(?) Group)
CAI:Min: 3
Comment:Age: Sc. anchoralis-Do. latus Zone (middle Osagean)
Biofacies: Bispathodid-gnathodid; outer platform to upper slope depositional environment.
CAI = 3

5.5 kg of rock processed (1820 g of +20 mesh and 124 g 20-140 mesh insoluble residue).
Heavy-mineral concentrate: chiefly iron oxides, phosphatized composite grains and bioclasts and phosphatic brachiopod fragments.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 20 Pa elements Bispathodus utahensis Sandberg and Gutschick
2 Conodonts 1 Pa element Geniculatus claviger Hass
3 Conodonts 11 Pa elements (all growth stages) Gnathodus semiglaber Bischoff
4 Conodonts 1 small bar fragment "Hindeodella" segaformis Bischoff s.f.
5 Conodonts 5 Idioprioniodus sp. indet. element fragments
6 Conodonts 1 juvenile Pa element Pseudopolygnathus sp.
7 Conodonts UNASSIGNED ELEMENT: 2 M and 1 Sc
8 Conodonts 110 indet. bar, blade, and platform fragments