Sample Detail of
Sample: Sample No. 92AD220-23 -- USGS No. 32427-PC
Locality: Field No. 92AD220-23
Description: Howard Pass C-3. Lat. 68o 38'10" N., Long. 157o 31'50" W. Sample from 60-cm-thick graded bed of crinoid-rich limestone about 40 m below top of 42-m-thick section; fault cuts section about 25 m above base. Thin section is skeletal grainstone containing 5-10 percent lithic clast. Bioclasts are 90 percent crinoid ossicles, minor fragments of bryozoans, brachiopods, and ostracodes, and rare echinoderm spines. Lithic clasts include calcareous and siliceous spiculite, lime mudstone, and peloidal-calcisphere pack-grainstone. Sample collected from carbonate turbidites (may contain reworked faunas). (description from Dover et al., 2004, p. 33 (Table 1)); [Howard Pass C-3. 68°38'10", 157°31'50". (description from Harris E&R report dated March 17, 1995)]
Location: Alaska Quadrangle: Howard Pass C-3
Township&Range: 9 S. 24 W. Section: 28
Lat.: 68o38'10 " Long.: 157o31'50 "
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: Kinderhookian-Osagean (late Kinderhookian - earliest Osagean (Early Mississippian))
Formation: Lisburne Group (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian))
CAI:Min: 1.5
Comment:Age: Early Mississippian; late Kinderhookian to earliest Osagean (Lower G. typicus Zone) if G. punctatus is indigenous.

Biofacies: Bispathodid-pseudopolygnathid; open-marine, middle shelf or deeper water depositional environment.

Shown as locality 27 on Sheet 2; map unit: Mlri

CAI=1.5

Processed 6.3 kg of rock.

Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 10 Pa elements Bispathodus utahensis Sandberg and Gutschick (all large and partly incomplete) All conodonts identified by A.G. Harris
2 Conodonts 2 Pa elements Gnathodus punctatus (Cooper)
3 Conodonts 2 Pa elements Polygnathus spp. indet.
4 Conodonts 6 incomplete Pa elements of Pseudopolygnathus spp.
5 Conodonts 2 M elements of Osagean morphotype
6 Conodonts 62 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: Kinderhookian-Osagean (latest Kinderhookian - earliest Osagean (Lower G. typicus Zone) if Gnathodus punctatus is indigenous)
Formation: Lisburne Group ("Ipnavik facies" of Lisburne Group)
CAI:Min: 1.5
Occurrence(s)
No. Group Name Qty Notes
1 Conodonts 10 Pa elements Bispathodus utahensis Sandberg and Gutschick (all large and partly incomplete)
2 Conodonts 2 Pa elements Gnathodus punctatus (Cooper)
3 Conodonts 2 Pa elements Polygnathus spp. indet.
4 Conodonts 6 incomplete Pa elements of Pseudopolygnathus spp.
5 Conodonts 2 M elements of Osagean morphotype
6 Conodonts 62 indet. bar, blade, and platform fragments