Georgian Bay Formation

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Georgian Bay Formation
Stratigraphic range: Upper Ordovician (upper Maysvillian-lower Richmondian)[1]
TypeFormation
Underlies
OverliesBlue Mountain Formation[2]
Location
RegionMichigan, Ontario
CountryUnited States, Canada

The Georgian Bay Formation is a geologic formation in Michigan and Ontario. It preserves fossils dating back to the Ordovician period. The type locality of the formation is on East Meaford Creek (previously called Workman Creek), south shore of Nottawasaga Bay, Georgian Bay.[2]

Description

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The formation consists of massive shale interbedded with siltstone/sandstone and limestone, with sub-horizontal bedding planes and widely spaced jointing.[3]

Fossil content

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Color key
Taxon Reclassified taxon Taxon falsely reported as present Dubious taxon or junior synonym Ichnotaxon Ootaxon Morphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ichnotaxa

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Ichnotaxa
Genus Species Presence Material Notes Images
Paleodictyon P. isp. A Southern Ontario.[1] 2 specimens, ROM 49424 and ROM 49624.[1]
?P. isp. B Southern Ontario.[1] 1 specimen: ROM 49625.[1]
Planolites P. constriannulatus Southern Ontario.[4]

Vertebrates

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Conodonts
Genus Species Presence Material Notes Images
Amorphognathus A. ordovicicus Lower part of the formation.[2] Also found in the Blue Mountain Formation.
Aphelognathus A. grandis Uppermost lower and upper members.[2]
A. politus Lower part of the formation.[2] Also found in the Blue Mountain Formation.
A. pyramidlis Upper member.[2]
Belodina B. confluens Lower member at southern Georgian Bay.[2]
Coelocerondontus C. trigonius Lower part and Upper member of the formation.[2]
Decoriconus D. fragilis Upper member, Kagawong West Quarry.[2]
Drepanoistodus D. suberectus Lower part, uppermost lower and upper members of the formation.[2] Also found in the Blue Mountain Formation.
Gen. et. sp. indet. 1 Upper member.[2]
Gen. et. sp. indet. 2 Upper member, Kagawong West Quarry.[2]
Gen. et. sp. indet. 3 Upper member, Kagawong West Quarry.[2]
Icriodella I. prominens Upper member, Kagawong West Quarry.[2]
I. superba Lower part of the formation.[2]
Oulodus O. robustus Upper and lower members.[2]
O. ulrichi Upper member.[2]
O. undulatus Upper member.[2]
Ozarkodina O. aff. O. hassi Upper member, Kagawong West Quarry.[2]
Panderodus P. gracilis Lower part and upper member of the formation.[2]
P. aff. P. gracilis Uppermost lower and upper members.[2]
P. staufferi Lower part and upper member of the formation.[2]
Paroistodus P. mutatus Lower part of the formation.[2] Also found in the Blue Mountain Formation.
Periodon P. grandis Lower part of the formation.[2] Also found in the Blue Mountain Formation.
Phragmodus P. undatus Lower part and upper member of the formation.[2] Also found in the Blue Mountain Formation.
Plectodina P. inclinata Upper member at southern Georgian Bay.[2]
P. tenuis Lower part and upper member of the formation.[2]
Pseudobelodina P. inclinata Upper member, Manitoulin Island.[2]
P. cf. P. kirki Upper member, Manitoulin Island.[2]
P. microdentata Manitoulin Island.[2]
P. quadrata Upper member,Manitoulin Island.[2]
P. vulgaris vulgaris Upper member,Manitoulin Island.[2]
Pseudooneotodus P. beckmanni Upper member, Kagawong West Quarry.[2]
Rhipidognathus R. symmetricus Upper part of the formation.[2]
Staufferella S. falcata Lower member at southern Georgian Bay.[2]
Walliserodus W. curvatus Upper member, Kagawong West Quarry.[2]
Zanclodus Z. sp. Upper member.[2]

Invertebrates

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Arthropods
Genus Species Presence Material Notes Images
Orcanopterus O. manitoulinensis Kangawong Submember, Manitoulin Island.[5] A eurypterid.
File:Orcanopterus.png
Brachiopods
Genus Species Presence Material Notes Images
Kinnella K. laurentiana Lower Kagawong Submember.[6] An orthide.
Other animals
Genus Species Presence Material Notes Images
Curviconophorus C. andersoni Scleritomous metazoan.[7]


See also

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References

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