| Sample: |
Sample No. 92AD57E -- USGS No. 32451-PC
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| Locality: |
Field No. 92AD57E
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| Description: |
Howard Pass C-5. Lat. 68o 33'43" N., Long. 158o 51'45" W. (description from Dover et al., 2004, p. 67 (Table 4)); [Howard Pass C-5. 68°33'43", 158°51'45". 1/2-6 cm-thick, platy- to flaggy-bedded, light-gray to beige, crinoidal (40%), partly dolomited micrite with spines interbedded with lime packstone-wackestone and packstone-grainstone.
Collected ~30 m below top of ~80 m-thick (very rough estimate) section in Mississippian "crinoidal facies" (of Gil Mull) of Lisburne Group.
Collected from southern end of small hill (~900 m+ high), 2.75 miles west of Drenchwater Creek, ~0.5 mile east of west fork and ~0.25 mile west of east fork of Rampart Creek; NE1/4SW1/4 sec. 23, T. 10 S., R. 30 W. (description from Harris E&R report dated March 17, 1995; shipment A-95-3)] |
| Location: |
Alaska Quadrangle: Howard Pass C-5 Township&Range: 10 S. 30 W. Section: 23
Lat.: 68o33'43 " Long.: 158o51'45 " |
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Reference
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| 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
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| Report by: |
Jim Dover
,
Irv L. Tailleur
,
Julie A. Dumoulin
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| | Age: | Kinderhookian (early Early Mississippian (middle to early late Kinderhookian)) |
| Formation: | Utukok Formation |
| CAI: | Min: 2 - Max: 3 |
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| Comment: | Age: early Early Mississippian; middle to early late Kinderhookian (Upper Si. duplicata Zone to lower part Si. isosticha-Upper Si. crenulata Zone). CAI: 2 or 3 Shown as locality 14 on Sheet 2; map unit: Mu REFERENCE
Dumoulin, J.A., and Harris, A.G., 1997, Kinderhookian (Lower Mississippian) calcareous rocks of the Howard Pass quadrangle, west-central Brooks Range, in Dumoulin, J.A., and Gray, J.E., eds., Geological studies in Alaska by the U.S. Geological Survey, 1995: U.S. Geological Survey Professional Paper 1574, p. 243-268. |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Conodonts |
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Conodonts |
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see also Dumoulin and Harris, 1997, table 1, loc. 15 |
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|
| Title: |
Report on Referred Fossils
,
1995
(03/17)
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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
|
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| | Age: | Kinderhookian (middle to early late Kinderhookian) |
| Formation: | Lisburne Group |
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| Comment: | Age: middle to early late Kinderhookian (Upper Si. duplicata Zone to lower part of Si. isostichia-Upper Si. crenulata Zone)
Biofacies: In place siphondellid biofacies; at least outer shelf or deeper water depositional environment.
CAI = ~3 (conodonts are frosted) 9.8 kg of rock processed (750 g or +20 mesh and 125 g 20-140 mesh insoluble residue).
Heavy-mineral occurrence: chiefly dolomite rhombs and clusters of weathered pyrite euhedra. |
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