| Sample: |
Sample No. 91AD11A -- USGS No. 31745-PC
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| Locality: |
Field No. 91AD11A
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| Description: |
Howard Pass C-3. Lat. 68o 35'55" N., Long. 157o 41'00" N. Sample from 80-m-thick measured section of unit Mlri; 11A, 70 m above base of section; 11G, 80 m above base of section. (description from Dover et al., 2004, p. 67 (Table 4)); [Field nos. 91AD11A, 11G, and 11J are from about an 80 m section of Lisburne Group in the Ipnavik allochthon on a northwest-trending ridge, 2 km southeast of the headwaters of Ribbon Creek and 0.4 km due west of an unnamed tributary of Cutaway Creek. Samples from north side of ridge, east slope. Top of ridge at about 680 m. From lat. 68°54.8', long. 157°38.8', sec. 11, T. 10 S., R. 25 W., Howard Pass C-3 quadrangle. Field No. 91AD11A (USGS colln. 31745-PC): about 70 m above base of section from limey bed about 22 cm thick--basal 2 cm coarse grained and crinoidal, upper part finer grained and laminated. (description from Harris, 1992 E&R report)] |
| Location: |
Alaska Quadrangle: Howard Pass C-3 Township&Range: 10 S. 25 W. Section: 11
Lat.: 68o35'55 " Long.: 157o41'00 " |
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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: | Osagean (No older than late Early Mississippian (no older than middle Osagean)) |
| Formation: | Unnamed (Rim Butte unit of Lisburne Group of Dumoulin and others (1993) (Mississippian)) |
| CAI: | Min: 2 - Max: 2.5 |
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| Comment: | Age: No older than late Early Mississippian (no older than middle Osagean); both samples contain redeposited conodonts of early Early Mississippian (Kinderhookian) age. CAI=2-2.5 Shown as locality 29 on Sheet 2; map unit: Mlri Table 1 contains additional conodont data from this locality. REFERENCE:
Dumoulin, J.A., Harris, A.G., and Schmidt, J.M., 1993, Deep-water lithofacies and conodont faunas of the Lisburne Group, western Brooks Range, Alaska, in Dusel-Bacon, C., and Till, A.B., eds., Geologic Studies in Alaska by the U.S. Geological Survey during 1992: U.S. Geological Survey Bulletin 2068, p. 12-30. |
| 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 others, 1993, table 1, loc. 19 |
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|
| Title: |
Report on Referred Fossils
,
1992
(06/25)
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All samples with the prefix 90AD59 are from a measured section through the west end of Ivotuk Hills, east side of Otuk Creek (west side of hill 745 m), sec. 20, T. 11 S., R. 16 W., lat. 68°28.5', long. 155°43.0'. Basal unit (59C) was mapped as "Kayak Shale"; all other samples are from the Lisburne Group. |
| Report by: |
Anita G. Harris
|
| Referred by: |
Julie A. Dumoulin
,
Jeanine Schmidt
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| | Age: | Osagean (no older than middle Osagean (no older than Upper typicus Subzone through most of the anchoralis-latus Zone)) |
| Formation: | Lisburne Group |
| CAI: | Min: 2 - Max: 2.5 |
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| Comment: | BIOFACIES: Indeterminate; postmortem winnow. Normal-marine depositional environment. AGE: No older than middle Osagean (No older than Upper typicus Subzone through most of the anchoralis-latus Zone) CAI=2-2.5 WEIGHTS & INSOLUBLE RESIDUES: WGT. (kg) 8.7; >20 MESH INSOL. RES., G 3030 g.; 20-200 MESH INSOL. RES., G 130 g. |
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