Sample: |
Sample No. 92AD47E -- USGS No. 32440-PC
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Locality: |
Field No. 92AD47E
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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 " |
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Reference
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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
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Referred by: |
Julie A. Dumoulin
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J. H. Dover
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| Age: | Early Mississippian (Early Mississippian, probably no older than late Kinderhookian) |
Formation: | Lisburne Group |
CAI: | Min: 1.5 |
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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. |
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