| Sample: |
Sample No. 92AD43D
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| Locality: |
Field No. 92AD43D
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| Description: |
Howard Pass C-4. Lat. 68o 32'53" N., Long. 158o 06'35" W. Sample from 4-cm-thick, evenly bedded, brownish-gray, peloidal lime grainstone containing possible mud intraclasts. Thin section is peloid-skeletal grainstone with abundant calcispheres and local fenestral fabric. Collected from unnamed Devonian limestone unit (Dl), near base of approx. 20-m-thick section of carbonate mudstone overlying less resistant, approx. 4-m-thick fossiliferous interval. (description from Dover et al., 2004, p. 32 (Table 1)); [Howard Pass C-4. 68°32'52", 158°06'40". 4 cm-thick, even-bedded, brownish-gray peloidal limestone with mud intraclasts(?).
Collected from unnamed Devonian limestone (Dls) unit, near base of ~20-m-thick carbonate mudstone overlying less resistant, ~4-cm-thick fossiliferous unit.
Collected ~2.5 miles north (and slightly west) of 92AD42 (probably part of the same unit), from 40 m+ high prominent white pinnacle of carbonate mudstone, ~1.75 miles due north of Kuna River and ~5 miles west of Story Creek; center sec. 25, T. 10 S., R. 27 W. (description from Harris E&R reports dated Jan. 25, 1995 (Shipment no. A-95-3a) and March 17, 1995 (Shipment no. A-95-3)] |
| 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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| Occurrence(s) |
| No. |
Group |
|
Name |
Qty |
Notes |
| 1 |
Conodonts |
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Unassigned elements: 1 Pb (Devonian and Mississippian morphotype), 1 M, 1 Sb, and 1 Sc elements |
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all conodonts identified by A.G. Harris |
| 2 |
Conodonts |
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11 indet. bar, blade, and platform fragments |
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| 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
|
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| | Age: | Devonian-Mississippian |
| Formation: | Unnamed (unnamed Devonian (Dls) unit) |
| CAI: | Min: 1.5 |
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| Comment: | Age: Devonian-Mississippian
Biofacies: Indeterminate (too few conodonts)
CAI = 1.5 9.6 kg of rock processed (200 g of +20 mesh and and 33 g 20-200 mesh insoluble residue).
Heavy-mineral concentrate: chiefly iron oxides, pyrite euhedra, clusters of euhedral pyrite, barite(?), and dolomite. |
| Occurrence(s) |
| No. |
Group |
|
Name |
Qty |
Notes |
| 1 |
Conodonts |
|
UNASSIGNED ELEMENTS: |
|
1 Pb (Devonian and Mississippian morphotype), 1 M, 1 Sb and 1 Sc elements |
| 2 |
Conodonts |
|
11 indet. bar, blade, and platform fragments |
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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
|
| Referred by: |
Julie A. Dumoulin
|
|
|
|
| | Age: | Devonian-Mississippian |
| Formation: | Unnamed (unnamed Devonian limestone (Dls) unit) |
| CAI: | Min: 1.5 |
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|
| Comment: | Age: Devonian-Mississippian
Biofacies: Indeterminate (too few conodonts)
CAI=1.5 Heavy-mineral concentrate: chiefly iron oxides, pyrite euhedra, clusters of euhedral pyrite, barite(?), and dolomite.
Wgt. (kg) 9.6; >20 mesh insol. res., (grams) 200; 20-200 mesh insol. res., (grams) 33 |
| Occurrence(s) |
| No. |
Group |
|
Name |
Qty |
Notes |
| 1 |
Conodonts |
|
UNASSIGNED ELEMENTS: |
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| 2 |
Conodonts |
|
1 Pb (Devonian and Mississippian morphotype), 1 M, 1 Sb and 1 Sc elements |
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| 3 |
Conodonts |
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11 indet. bar, blade, and platform fragments |
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