Sample Detail of
Sample: Sample No. 78AMm035D
Locality: Field No. 78AMm035D
Description: 7 km 008o from inlet to Feniak Lake, elev. 2000, T. 34 N., R. 2 E. (lat. 68o 21 min., long. 158o 20 min.). Limestone lenses and pods in pillow basalt. Sequence structurally below the Siniktanneyak mafic/ultramafic complex. Collected by Mile Mullen. (description from Harris E&R report of 10/11/1978 [Dover et al., 2004, p. 69 (Table 4) provides following description: "Howard Pass B-4. Lat. 68o 20' N., 158o 19'23" W. Collected from limestone within Copter Peak basal unit of Siniktanneyak mafic complex."][No description given in Nelson and Nelson, 1982; shown as locality 11 of map (Table 1)]
Location: Alaska Quadrangle: Howard Pass B-4
Township&Range: T34N R2E
Lat.: 68o20'00 " Long.: 158o19'23 "
Reference
Title: Report on Referred Fossils ,  1978 (10/11)
The heavy- and light-mineral insoluble residues are being returned to you for your disposal.

Steve--Have just about finished processing samples 17-32 of your monster shipment and THREE of these have conodonts. Will write this batch up in about one week.
Report by: Anita G. Harris
Referred by: Steven W. Nelson , M. M. Hoare , M. W. Mullen
Age: Devonian-Triassic
Comment:500 g of limestone was processed for conodonts (21 g of +20 mesh material remained undissolved after acid treatment).

These morphotypes indicate a Devonian to Triassic age. Another collection of 4-5 kg from the same interval should provide sufficient conodonts for a better age determination.

The color alteration index is 3 indicating the host rock reached 120o -150o C., but could have been hotter for a very short period of geologic time.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 1 p (spathognathodan) element of post-Silurian morphotype
2 Conodonts 1 N (synprioniodinan) element

Title: Geologic and Fossil Locality Maps of the West-Central Part of the Howard Pass Quadrangle and Part of the Adjacent Misheguk Mountain Quadrangle, Western Brooks Range, Alaska (part 2 of single issue)) ,  2004
Report by: Jim Dover , Irv L. Tailleur , Julie A. Dumoulin
Age: Devonian-Triassic
Formation: Unnamed (Basalt (Jurassic? to Devonian?))
CAI:Min: 3
Comment:Age: Devonian-Triassic

CAI=3

Shown as locality 114 on Sheet 2; map unit: JDbc

REFERENCE:
Nelson, S.W., and Nelson, W.H., 1982, Geology of Siniktanneyak Mountain ophiolite, Howard Pass quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map MF-1441, scale 1:63,360.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Conodonts see also Nelson and Nelson, 1982, table 1, loc. 11

Title: Geology of the Siniktanneyak Mountain ophiolite, Howard Pass quadrangle, Alaska ,  1982
Report by: Steven W. Nelson , Willis H. Nelson
Age: Devonian-Triassic
Formation: Unnamed (Limestone (Middle or Upper Devonian))
Comment:Age: Devonian to Triassic

Shown as locality 11 on map; Map symbol: Dpbl

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts Conodonts Identified by A. Harris; Report No. A-78-30