Thunder Bay Limestone
Geological Formations
Thunder Bay Limestone | |
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Stratigraphic range: Middle Devonian (Givetian)[1] PreꞒ Ꞓ O S D C P T J K Pg N ↓ | |
Type | Geological formation |
Unit of | Traverse Group[1] |
Sub-units | Partidge Point Member, Potter Farm Member, and Norway Point Member |
Underlies | Kettle Point Formation and Squaw Bay Limestone |
Overlies | Potter Farm Formation[1] |
Location | |
Region | ![]() |
Country | ![]() |
The Thunder Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/3/3d/An_examination_of_the_Devonian_fishes_of_Michigan_fig-1-full.png/150px-An_examination_of_the_Devonian_fishes_of_Michigan_fig-1-full.png)
Fossil content
Vertebrates
Conodonts
Conodonts reported from the Thunder Bay Limestone | |||||
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Genus | Species | Presence | Material | Notes | Images |
Icriodus | I. cymbiformis | [2] | Also found in the Detroit River, Traverse, Antrim, Ferron Point, Genshaw, Alpena and Norway Point formations. | ||
I. expansus | [2] | Also found in the Detroit River, Traverse, Antrim, Lucas, Anderdon, Dundee, Bell, Ferron Point, Genshaw, Alpena, Potter Farm and Norway Point formations. | |||
I. latericrescens latericrescens | [2] | Also found in the Traverse, Bell, Ferron Point, Genshaw, Newton Creek, Alpena, Four Mile Dam,,Norway Point and Potter Farm formations. | |||
Polygnathus | P. varcus | [2] | Also found in the Traverse, Antrim, Alpena, Four Mile Dam and Norway Point formations. |
Placoderms
Placoderms reported from the Thunder Bay Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Ptyctodus | P. sp. | "Northeast shore of Partridge Point, 6.4 kilometers south of Alpena".[1] | A tooth plate (UMMP 3023).[1] | A ptyctodontid. | ![]() |
Invertebrates
Brachiopods
Brachiopods reported from the Thunder Bay Limestone | |||||
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Genus | Species | Presence | Material | Notes | Images |
Pentamerella | P. proteus | [3] | |||
Spinulicosta | S. mutocosta | [3] | Also found in the Bell, Rockport Quarry, Ferron Point, Four Mile Dam, Beebe School and Potter Farm formations. |
Cnidarians
Cnidarians reported from the Thunder Bay Limestone | |||||
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Genus | Species | Presence | Material | Notes | Images |
Syringopora | S. ehlersi | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County.[4] | A tabulate coral. | ![]() |
Echinoderms
Echinoderms reported from Thunder Bay Limestone | |||||
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Genus | Species | Presence | Material | Notes | Images |
Corocrinus | C. pettyesi | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County.[5] | A crinoid. | ||
Gennaeocrinus | G. romingeri | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County.[5] | A crinoid. |
Trilobites
Trilobites reported from the Thunder Bay Limestone | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Dechenella | D. (Basidechenella) reimanni | Alpena County, Michigan.[6] | |||
D. (Basidechenella) sp. C | Alpena County, Michigan.[6] | A single specimen.[6] | |||
Dipleura | D. dekayi | Partridge Point on Thunder Bay, about 4 miles south of Alpena.[6] | Also found in the Norway Point Formation. | ![]() | |
Greenops | G. alpenensis | Alpena County, Michigan.[6] | |||
Phacops | P. iowensis | Alpena County, Michigan.[6] | Also found in the Potter Farm and Petoskey formations. | ||
Proetus | P. (Crassiproetus) alpenensis | [6] | Also found in the Potter Farm Formation. |
See also
References
- ^ a b c d e f Stack, Jack; Sallan, Lauren (2018-09-20). "An examination of the Devonian fishes of Michigan". PeerJ. 6 (2). doi:10.7717/peerj.5636. PMC 6151260.
- ^ a b c d Orr, R. William (1971). "Conodonts from Middle Devonian Strata from the Michigan Basin".
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(help) - ^ a b Imbrie, John (1959). "Brachiopods of the Traverse group (Devonian) of Michigan. Part 1, Dalmanellacea, Pentameracea, Strophomenacea, Orthotetacea, Chonetacea, and Productacea. Bulletin of the AMNH; v. 116, article 4".
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(help) - ^ Watkins, J. Lloyd (1959). "Middle Devonian Auloporid Corals from the Traverse Group of Michigan". Journal of Paleontology. 33 (5): 793–808. ISSN 0022-3360.
- ^ a b Kesling, Robert V. (1964). "Two New Crinoids of the Family Periechocrinitidae from the Middle Devonian Thunder Bay Limestone of Michigan". Contributions from the Museum of Paleontology, University of Michigan. XIX (11): 143–155.
- ^ a b c d e f g Stumm, Erwin (1953). "Trilobites of the Devonian Traverse Group of Michigan" (PDF). University of Michigan Press - Museum of Paleontology.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 17 December 2021.
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