Sample Detail of
Sample: Sample No. 92AD49A -- USGS No. 32438-PC
Locality: Field No. 92AD49A
Description: Howard Pass C-3. Lat. 68o 30'55" N., Long. 157o 31'45" W. Sample from 5-15 cm-thick layers and lenses of dolostone intercalated with similarly thick layers and lenses of chert showing skeletal wackestone to packstone texture. Thin section is dolomite crystal mosaic containing rare relict crinoid ossicles and spicules. Collected from lowest outcrop of dolostone and chert, approx. 155 m below 92AD-120 (loc. 71) and approx. 320 m below the top of unit Mlb. Heavy mineral concentrate is chiefly fluorite. (description from Dover et al., 2004, p. 39 (Table 1));
Howard Pass C-3. 68°30'55", 157°31'45". 5-15 cm-thick layers and lenses of dolostone intercalated with similarly thick layers and lenses of chert bands showing skeletal wackestone to packstone texture. Collected from lowermost outcrop of dolostone and chert, ~120m(?) stratigraphically below base of 92AD33 measured section and >140 m below 92AD33-120.
Collected at ~1020 m elevation/ ~0.5 mile due north of base of measured section (92AD33) and due east of 92AD47; center sec. 4, T. 11 S., R. 24 W. (description from Harris E&R report dated March 17, 1995).
Location: Alaska Quadrangle: Howard Pass C-3
Township&Range: 11 S 24 W. Section: 4
Lat.: 68o30'55 " Long.: 157o31'45 "
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: Early Mississippian (Early Mississippian, probably no older than late Kinderhookian)
Formation: Lisburne Group (Bupto facies of Lisburne Group (Upper and Lower Mississippian))
CAI:Min: 1.5
Comment:Age: Early Mississippian, probably no older than late Kinderhookian.

Biofacies: Indeterminate (too few conodonts); probably normal-marine depositional environment. Conodont species association is similar to that found in some samples of the Rough Mountain Creek unit (Mlr).

Shown as locality 68 on Sheet 2; map unit: Mlb

CAI=1.5

Processed 10.1 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa elements (incomplete) Bispathodus utahensis Sandberg and Gutschick .... All conodonts identified by A.G. Harris
2 Conodonts ..... or B. stabilis (Branson & Mehl)
3 Conodonts 3 Sb-Sc element fragments of Kladognathus sp. indet.
4 Conodonts Unassigned elements: 3 Pb and 3 M (2 morphotypes)
5 Conodonts 19 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: Early Mississippian (Early Mississippian, probably no older than late Kinderhookian)
Formation: Lisburne Group
CAI:Min: 1.5
Comment:Age: Early Mississippian, probably no older than late Kinderhookian.
Biofacies: Indeterminate (too few conodonts); probably normal-marine depositional environment.
CAI = 1.5

10.1 kg of rock processed (420 g +20 mesh and 194 g 20-100 mesh insoluble residue).
Heavy-mineral concentrate: chiefly fluorite.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa elements (incomplete) Bispathodus utahensis Sandberg and Gutschick or .....
2 Conodonts ....... Bispathodus stabilis (Branson and Mehl)
3 Conodonts 3 Sb-Sc element fragments Kladognathus sp. indet.
4 Conodonts UNASSIGNED ELEMENTS: 3 Pb and 3 M (2 morphotypes)
5 Conodonts 19 indet. bar, blade, and platform fragments