Sample Detail of
Sample: Sample No. 92AD47E -- USGS No. 32440-PC
Locality: Field No. 92AD47E
Description: Howard Pass C-3. Lat. 68o 30'53" N., Long. 157o 32'00" W. Thin (4- to 8-cm thick), nodular-bedded to evenly bedded, skeletal (crinoidal-bryozoan?) lime pack/grainstone with local shaly partings. Thin section is partly silicified skeletal supportstone; bioclasts include abundant crinoid ossicles, brachiopod and bryozoan fragments, and siliceous sponge spicules. Collected at the lowest exposed beds here, approx. 20 m stratigraphically below 92AD47A and approx. 360 m below the top of unit Mlb. (description from Dover et al., 2004, p. 38 (Table 1));
[Howard Pass C-3. 68°30'53", 157°32'00". 4-8 cm-thick, nodular- to even-bedded, skeletal (crinoidal-bryozoan?) lime packstone-grainstone with local shaly partings.
Collected at the lowest exposed beds here, ~20 m stratigraphically below 92AD47A.
Collected at ~900 m elevation at same locality as above. (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.: 68o30'53 " 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: 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: Polygnathid. Normal-marine depositional environment: Po. communis communis was eurytopic but did not occur in large numbers in restricted marine environments. 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 10.9 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 16 Pa elements (mostly incomplete) Bispathodus utahensis Sandberg and Gutschick ..... All conodonts identified by A.G. Harris
2 Conodonts .... or B. stabilis (Branson and Mehl)
3 Conodonts 48 Pa elements Polygnathus communis communis Branson and Mehl (small juveniles to adults)
4 Conodonts Unassigned elements: 9 M (4 morphotypes), 1 Sa, 1 Sb, and 4 Sc (2 morphotypes)
5 Conodonts 46 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: Polygnathid; normal-marine depositional environment (Po. communis communis was eurytopic but did not occur in large numbers in restricted marine environments).
CAI = 1.5

10.9 kg of rock processed (2480 g +20 mesh and 229 g 20-200 mesh insoluble residue).
Heavy-mineral concentrate: chiefly barite(?), dolomite rhombs, and iron oxides.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 16 Pa elements (mostly incomplete) Bispathodus utahensis Sandberg and Gutschick .....
2 Conodonts ..... or Bispathodus stabilis (Branson and Mehl)
3 Conodonts 48 Pa elements Polygnathus communis communis Branson and Mehl (small juveniles to adults)
4 Conodonts UNASSIGNED ELEMENTS: 9 M (4 morphotypes), 1 Sa, 1 Sb, and 4 Sc (2 morphotypes)
5 Conodonts 48 indet. bar, blade, and platform fragments