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Thunder Bay Limestone

The Thunder Bay Limestone is a geologic formation in Michigan. It preserves fossils dating back to the Devonian period.

Thunder Bay Limestone
Stratigraphic range: Middle Devonian (Givetian)[1]
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TypeGeological formation
Unit ofTraverse Group[1]
Sub-unitsPartidge Point Member, Potter Farm Member, and Norway Point Member
UnderliesKettle Point Formation and Squaw Bay Limestone
OverliesPotter Farm Formation[1]
Location
Region Michigan
Country United States
Stratigraphy of the Devonian deposits of the northern part of the Lower Peninsula of Michigan, showing the Thunder Bay Limestone[1]

Fossil content

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Vertebrates

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Conodonts

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Conodonts reported from the Thunder Bay Limestone
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

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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

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Brachiopods

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Brachiopods reported from the Thunder Bay Limestone
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

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Cnidarians reported from the Thunder Bay Limestone
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

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Echinoderms reported from Thunder Bay Limestone
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

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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

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References

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  1. ^ 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.
  2. ^ a b c d Orr, R. William (1971). "Conodonts from Middle Devonian Strata from the Michigan Basin". {{cite journal}}: Cite journal requires |journal= (help)
  3. ^ 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". {{cite journal}}: Cite journal requires |journal= (help)
  4. ^ Watkins, J. Lloyd (1959). "Middle Devonian Auloporid Corals from the Traverse Group of Michigan". Journal of Paleontology. 33 (5): 793–808. ISSN 0022-3360.
  5. ^ 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.
  6. ^ 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.


 

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