| Sample: |
Sample No. 92AD43E -- USGS No. 12466-SD
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| Locality: |
Field No. 92AD43E
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| Description: |
Howard Pass C-4. Lat. 68o 32'53" N., Long. 158o 06'35" W. Brownish-gray, grayish-orange-weathering, fossiliferous lime wackestone to packstone containing bryozoans and corals. Forms matrix to abundant large colonial corals of Pragian-Eifelian age (see table 3 for megafossil data). Thin section is coralline pack/wackestone that has a dolomitic matrix. Collected from unnamed Devonian limestone unit (Dl), at about middle of approx. 4-m-thick fossiliferous interval underlying carbonate mudstone. (description from Dover et al., 2004, p. 32 (Table 1)); [Howard Pass C-4. 68°32'52", 158°06'40". Brownish-gray, grayish orange-weathering, fossiliferous lime wackestone to packstone containing bryozoans and corals. Forms matrix to abundant large colonial corals (Pragian-Eifelian), reported on by Bill Oliver, E and R: A-93-6.
Collected from unnamed Devonian limestone unit (Dls) unit, at about middle of ~4 m-thick fossiliferous unit underlying carbonate mudstone.
From same locality as above ("referring to 92AD43D"). (description from Harris E&R reports dated Jan. 25, 1995 (Shipment no. A-95-3a) and March 17, 1995 (shipment A-95-3)0. |
| Location: |
Alaska Quadrangle: Howard Pass C-4 Township&Range: 10 S. 27 W. Section: center sec. 25
Lat.: 68o32'53 " Long.: 158o06'35 " |
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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
,
J. H. Dover
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| | Age: | Pragian-Eifelian (Early-Middle Devonian--Corals restrict age to Pragian - Eifelian (middle Early-early Middle Devonian)) |
| Formation: | Unnamed (unnamed Devonian limestone (Dls) unit) |
| CAI: | Min: 1.5 |
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| Comment: | Age: Early-Middle Devonian--Corals restrict age to Pragian-Eifelian (middle Early-early Middle Devonian)
Biofacies: Panderodid biofacies; shallow-water shelf, relatively normal marine depositional environment.
CAI = 1.5 9.2 kg of rock processed (260 g of +20 mesh and 37 g 20-200 mesh insoluble residue).
Heavy-mineral concentrate: chiefly iron oxides, weather and fresh pyrite euhedra, dolomite rhombs, and ferruginous bioclasts. |
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| Title: |
Report on Referred Fossils
,
1995
(01/25)
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All conodont analyses and samples and residue weights are given in the attached tables. The age range of all samples is graphically shown on the accompanying diagram. Please give a copy of this report to Jim Dover and anyone else on the Howard Pass project that needs these data. I will do all the Carboniferous samples while in Florida. |
| Report by: |
Anita G. Harris
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| Referred by: |
Julie A. Dumoulin
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| | Age: | Pragian-Eifelian (Pragian - Eifelian (middle Early-early Middle Devonian)) |
| Formation: | Unnamed (unnamed Devonian limestone (Dls) unit) |
| CAI: | Min: 1.5 |
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| Comment: | Age: Early-Middle Devonian--Corals restrict age to Pragian-Eifelian middle Early-early Middle Devonian.
Biofacies: Panderodid biofacies; shallow-water shelf, relatively normal-marine depositional environment.
CAI=1.5 Heavy-mineral concentrate: chiefly iron oxides, weathered and fresh pyrite euhedra, dolomite rhombs and ferruginous bioclasts.
Wgt. (kg) 9.2; >20 mesh insol. res., (grams) 260; 20-200 mesh insol. res., (grams) 37 |
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