| Sample: |
Sample No. 6798-35
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| Locality: |
Field No. DR 8759
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| Description: |
Deacon Rock Section, Sections 18 + 22, T 25N, R 22E, Black River Quad. Rock is a crinoidal grainstone. This section was sampled at fair to good exposures on the north side of the Porcupine River from the first good exposure east of Deacon Rock (about one mile) eastward nearly to it the first north tributary of the River. For diagram illustrating this section see Sheet 12 of GMC Report 465 (Furer, L.C., and Amoco Oil Co., 2019, Data compilation of the 1972 field party, southeast Brooks Range and Fort Yukon, Alaska; Vol 2: Alaska Division of Geological & Geophysical Surveys Geologic Materials Center Data Report 465, 10 p., 33 sheets, scale 1:250,000. https://doi.org/10.14509/30310). |
| Location: |
Alaska Quadrangle: Black River A-5 Township&Range: 25N 22E Section: 18
Lat.: 66o59'45 " Long.: 143o02'00 " |
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Reference
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| Title: |
Appendix B: Paleontology data, in Furer, L.C., Fehlman, R.H.,Taylor, A.M>, Self, G.W. and Amoco Oil Co., Data compilation of the 1971 field party, southeast Brooks Range and Fort Yukon, Alaska; Vol. 1.. GMC Data Report 464B
,
1971
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| Report by: |
F. C. Furer
,
and others
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| | Age: | Devonian |
| Formation: | Salmontrout Limestone |
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| Comment: | Furer, L.C., and Amoco Oil Co., 2019, Appendix B: Paleontology data, in Furer, L.C., Fehlmann, R.H., Taylor, A.M., Self, G.W., and Amoco Oil Co., Data compilation of the 1971 field party, southeast Brooks Range and Fort Yukon, Alaska; Vol 1: Alaska Division of Geological & Geophysical Surveys Geologic Materials Center Data Report 464B. https://doi.org/10.14509/30394 (p. 4) Paleontologic study demonstrates the presence in this section of a considerable thickness of Salmontrout Limestone of a non-brachiopodal reef facies which is different from the brachiopod-rich type section. The section includes Ordovician strata related to those in Amoco J section (Locality 6372) overlain by Silurian carbonates (6798-23, 24) rich in tabulate corals. Still higher are rocks of definite reef character, the part of which is either Upper Silurian or Lower Devonian and the upper part of which is Lower Devonian Salmontrout Reef differing from the type section in being essentially barren of shelly fossils. The proximity of the Deacon Rock reef to a basinal Lower Devonian shale section (Locality 6261, sample LCF 61) together with the non-shelf biofacies that is represented, suggest the possibility that the Salmontrout at Deacon Rocks is an intra-basinal pinnacle reef rather than the shelf-edge type of reef represented by the type Salmontrout . If correctly interpreted, the idea of intra-basinal reefing beyond the limits of the Salmontrout-age carbonate bank must be considered. GMC Report 465, p. 2 “Early Devonian Salmontrout reefal limestones were found at three new localities - Nelsen Bluff, Woodchopper and Deacon Rock. The 600 feet section at Deacon rock ranges in age from Late Silurian to Early Devonian. This Salmontrout Reef differs from the type section in being essentially barren of shelly fossils. The main reef builders at Deacon Rock are corals, byrozoans, and stromatoporoids.” LATITUDE/LONGITUDE APPROXIMATE. Amoco's megafossil collections are now supposed to be reposited at the Sam Noble Museum, Univ. Oklahoma in Norman, OK |
| Occurrence(s) |
| No. |
Group |
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Name |
Qty |
Notes |
| 1 |
Crinoids |
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Gasterocoma n. sp. |
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identified by Allen R. Ormiston |
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