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Georgian Bay Formation

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]

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

Description

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

Fossil content

Color key
TaxonReclassified taxonTaxon falsely reported as presentDubious taxon or junior synonymIchnotaxonOotaxonMorphotaxon
Notes
Uncertain or tentative taxa are in small text; crossed out taxa are discredited.

Ichnotaxa

Ichnotaxa
GenusSpeciesPresenceMaterialNotesImages
PaleodictyonP. isp. ASouthern Ontario.[1]2 specimens, ROM 49424 and ROM 49624.[1]
?P. isp. BSouthern Ontario.[1]1 specimen: ROM 49625.[1]
PlanolitesP. constriannulatusSouthern Ontario.[4]

Vertebrates

Conodonts
GenusSpeciesPresenceMaterialNotesImages
AmorphognathusA. ordovicicusLower part of the formation.[2]Also found in the Blue Mountain Formation.
AphelognathusA. grandisUppermost lower and upper members.[2]
A. politusLower part of the formation.[2]Also found in the Blue Mountain Formation.
A. pyramidlisUpper member.[2]
BelodinaB. confluensLower member at southern Georgian Bay.[2]
CoelocerondontusC. trigoniusLower part and Upper member of the formation.[2]
DecoriconusD. fragilisUpper member, Kagawong West Quarry.[2]
DrepanoistodusD. suberectusLower part, uppermost lower and upper members of the formation.[2]Also found in the Blue Mountain Formation.
Gen. et. sp. indet. 1Upper member.[2]
Gen. et. sp. indet. 2Upper member, Kagawong West Quarry.[2]
Gen. et. sp. indet. 3Upper member, Kagawong West Quarry.[2]
IcriodellaI. prominensUpper member, Kagawong West Quarry.[2]
I. superbaLower part of the formation.[2]
OulodusO. robustusUpper and lower members.[2]
O. ulrichiUpper member.[2]
O. undulatusUpper member.[2]
OzarkodinaO. aff. O. hassiUpper member, Kagawong West Quarry.[2]
PanderodusP. gracilisLower part and upper member of the formation.[2]
P. aff. P. gracilisUppermost lower and upper members.[2]
P. staufferiLower part and upper member of the formation.[2]
ParoistodusP. mutatusLower part of the formation.[2]Also found in the Blue Mountain Formation.
PeriodonP. grandisLower part of the formation.[2]Also found in the Blue Mountain Formation.
PhragmodusP. undatusLower part and upper member of the formation.[2]Also found in the Blue Mountain Formation.
PlectodinaP. inclinataUpper member at southern Georgian Bay.[2]
P. tenuisLower part and upper member of the formation.[2]
PseudobelodinaP. inclinataUpper member, Manitoulin Island.[2]
P. cf. P. kirkiUpper member, Manitoulin Island.[2]
P. microdentataManitoulin Island.[2]
P. quadrataUpper member,Manitoulin Island.[2]
P. vulgaris vulgarisUpper member,Manitoulin Island.[2]
PseudooneotodusP. beckmanniUpper member, Kagawong West Quarry.[2]
RhipidognathusR. symmetricusUpper part of the formation.[2]
StaufferellaS. falcataLower member at southern Georgian Bay.[2]
WalliserodusW. curvatusUpper member, Kagawong West Quarry.[2]
ZanclodusZ. sp.Upper member.[2]

Invertebrates

Arthropods
GenusSpeciesPresenceMaterialNotesImages
OrcanopterusO. manitoulinensisKangawong Submember, Manitoulin Island.[5]A eurypterid.
Brachiopods
GenusSpeciesPresenceMaterialNotesImages
KinnellaK. laurentianaLower Kagawong Submember.[6]An orthide.
Other animals
GenusSpeciesPresenceMaterialNotesImages
CurviconophorusC. andersoniScleritomous metazoan.[7]


See also

References


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