Thunder Bay Limestone | |
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Stratigraphic range: Middle Devonian (Givetian)[1]
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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 formationinMichigan. It preserves fossils dating back to the Devonian period.
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 reported from the Thunder Bay Limestone | |||||
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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] | Aptyctodontid. | ![]() |
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 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] | Atabulate coral. | ![]() |
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] | Acrinoid. | ||
Gennaeocrinus | G. romingeri | Bluffs on northeast shore of Partridge Point, 4 miles south of Alpena, Alpena County.[5] | Acrinoid. |
Trilobites reported from the Thunder Bay Limestone | |||||
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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. |
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