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Geological feature in Michigan USA
The Four Mile Dam Formation, also called the Four Mile Dam Limestone, is a geologic formation in Michigan. It preserves fossils dating back to the middle Devonian period.
Stratigraphy of the Devonian deposits of the northern part of the Lower Peninsula of Michigan, showing the Four Mile Dam Formation[1]
Conodonts reported from the Four Mile Dam Formation
|
Genus |
Species |
Presence
|
Material |
Notes |
Images
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Acodina
|
A. formosa
|
[3]
|
|
Also found in the Detroit River, Traverse, Dundee, Bell, Alpena and Norway Point formations.
|
|
Belodella
|
B. devonicus
|
[3]
|
|
Also found in the Detroit River, Traverse, Antrim, Alpena and Norway Point formations.
|
|
Icriodus
|
I. latericrescens latericrescens
|
[3]
|
|
Also found in the Traverse, Bell, Ferron Point, Genshaw, Newton Creek, Alpena, Norway Point, Potter Farm and Thunder Bay formations.
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|
Ozarkodina
|
O. willsi
|
[3]
|
|
Also found in the Detroit River, Traverse, Antrim, Dundee, Alpena and Norway Point formations.
|
|
Polygnathus
|
P. varcus
|
[3]
|
|
Also found in the Traverse, Antrim, Alpena, Norway Point and Thunder Bay formations.
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|
|
|
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Color key
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Notes Uncertain or tentative taxa are in small text; crossed out taxa are discredited.
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Brachiopods reported from the Four Mile Dam Formation
|
Genus |
Species |
Presence
|
Material |
Notes |
Images
|
Douvillina
|
D. distans
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
|
|
Also found in the Hungry Hollow Formation and Logansport Formation.
|
|
Leptalosia
|
L. radicans
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
|
|
Also found in the Norway Point, Gravel Point, Alpena and Genshaw formations.
|
|
Longispina
|
L. emmetensis
|
Dock Street clay member.[4]
|
|
Also found in the Alpena Limestone and Gravel Point Formation.
|
|
Megastrophia
|
M. gibbosa
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
|
|
Also found in the Hungry Hollow Formation and Logansport Formation.
|
|
Oligorhachis
|
O. oligorhachis
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
|
|
Also found in the Gravel Point Formation.
|
|
Pentamerella
|
P. alpenensis
|
Dock Street clay member.[4]
|
|
Also found in the Alpena Limestone and Gravel Point Formation.
|
|
P. sp. C
|
Dock Street clay.[4]
|
A complete specimen.[4]
|
|
|
Protoleptostrophia
|
P. lirella
|
Dock Street clay member.[4]
|
|
Also found in the Norway Point Formation and Alpena Limestone.
|
|
Schuchertella
|
S. anomala
|
Possibly the Dock Street clay member.[4]
|
|
Also found in the Gravel Point Formation.
|
|
S. sp.
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
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|
|
|
Spinulicosta
|
S. mutocosta
|
Four Mile Dam, Thunder Bay River, Alpena County, Michigan.[4]
|
|
Also found in the Bell, Rockport Quarry, Ferron Point, Beebe School, Thunder Bay and Potter Farm formations.
|
|
Strophodonta
|
S. erratica
|
Dock Street clay member.[4]
|
|
Also found in the Alpena Limestone and Gravel Point Formation.
|
|
S. fissicosta
|
Dock Street clay member.[4]
|
|
Also found in the upper Gravel Point Formation.
|
|
S. nanus
|
Dock Street clay member.[4]
|
|
Also found in the Alpena Limestone and Gravel Point Formation.
|
|
S. paula
|
Dock Street clay member.[4]
|
|
Also found in the Alpena Limestone.
|
|
S. sp. B
|
Dock Street clay member and overlying crystalline limestone beds.[4]
|
Several specimens.[4]
|
|
|
Rhipidomella
|
R. penelope traversensis
|
Thunder Bay River, Alpena County, Michigan.[4]
|
|
|
|
Corals reported from the Four Mile Dam Formation
|
Genus |
Species |
Presence
|
Material |
Notes |
Images
|
Aulocystis
|
A. cooperi
|
[5]
|
|
Also found in the Plum Brook shale, Silica shale and Potter Farm Formation.
|
|
A. jacksoni
|
Dock Street clay member.[5]
|
|
Also found in the Silica Shale, Ferron Point Formation, Petoskey Formation, Hungry Hollow Formation, Widder Shale, Wanakah shale and Centerfield Limestone.
|
|
Aulopora
|
A. conferta
|
[5]
|
|
Also found in the Bell, Ferron Point, Gravel Point, Genshaw, Alpena, Potter Farm, Petoskey and Hungry Hollow formations.
|
|
A. gregaria
|
[5]
|
|
Also found in the Genshaw Formation, Alpena Limestone and Petoskey Formation.
|
|
Pachyphragma
|
P. concentricum
|
Dock Street clay member.[5]
|
|
Also found in the Ferron Point Formation, Gravel Point Formation and Alpena Limestone.
|
|
- ^ a b c d e f g h i 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 e f g h i j k l m n o p q r s t u v w x y z aa Tyler, John H. (1965). "Gastropods from the Middle Devonian Four Mile Dam Limestone (Hamilton) of Michigan". Journal of Paleontology. 39 (3): 341–349. ISSN 0022-3360.
- ^ a b c d e Orr, R. William (1971). "Conodonts from Middle Devonian Strata from the Michigan Basin".
- ^ a b c d e f g h i j k l m n o p q r s 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".
- ^ a b c d e Watkins, J. Lloyd (1959). "Middle Devonian Auloporid Corals from the Traverse Group of Michigan". Journal of Paleontology. 33 (5): 793–808. ISSN 0022-3360.
- ^ Tyler, John H. (1964). "Anostylostroma anacolumna n. sp. from the Four Mile Dam Limestone (Hamilton), Alpena County, Michigan". Journal of Paleontology. 38 (5): 885–886. ISSN 0022-3360.
- ^ a b c d e f g h Stumm, Erwin (1953). "Trilobites of the Devonian Traverse Group of Michigan" (PDF). University of Michigan Press - Museum of Paleontology.