Sample Detail of
Sample: Sample No. 92AD47A -- USGS No. 32439-PC
Locality: Field No. 92AD47A
Description: Howard Pass C-3. Lat. 68o 30'53" N., Long. 157o 32'00" W. Sample from 5-cm-thick unulatory beds of lime crinoidal packstone-grainstone with millimeter-thick shaly partings. Thin section is crinoidal grainstone along with minor dolomite and chert. Collected approx. 20 m stratigraphically below 92AD49A (loc. 68) and approx. 340 m below the top of the Mlb unit. Heavy-mineral concentrate includes gastropod steinkerns. (description from Dover et al., 2004, p. 38 (Table 1));
[Howard Pass C-3. 68°30'53", 157°32'00". 5 cm-thick undulatory beds of lime crinoidal packstone-grainstone with mm-thick shaly partings.
Collected ~2- stratigraphically below 92AD49A.
Collected at ~940 m elevation, due west of 92AD49; center sec. 4, T. 11 S., R. 24 W.
Armstrong suggested an age of late Osagean or Meramecian (based on brachiopods and corals) for 47A and 47E lithologies, slightly (few 100 m) south of this locality. (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.: 68o39'53 " Long.: 157o32'00 "
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: Lower Mississipian (Early Mississipian (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 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 67 on Sheet 2; map unit: Mlb

CAI=1.5

Processed 9.0 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 and Mehl)
3 Conodonts Kladognathus sp. indet., 1 M and 1 Sb-Sc element fragments
4 Conodonts 14 Pa elements Polygnathus communis communis Branson and Mehl
5 Conodonts 1 unassigned Sc element
6 Conodonts 21 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

9.0 kg of rock processed (560 g +20 mesh and 257 g 20-200 mesh insoluble residue.
Heavy-mineral concentrate (+100 mesh): chiefly amorphoous phosphatized grains (including gastropod steinkerns) and dolomite rhombs.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 3 Pa elements (incomplete) Bispathodus utahensis Sandberg and Gutschick .....
2 Conodonts ...... or Bispathodus stabilis (Branson and Mehl)
3 Conodonts Kladognathus sp. indet. 1 M, 1 Sb-Sc element fragments
4 Conodonts 14 Pa elements Polygnathus communis communis Branson and Mehl
5 Conodonts 1 unassigned Sc element
6 Conodonts 21 indet. bar, blade, and platform fragments