Georgian Bay Formation

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

Contents

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

Ichnotaxa

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

Vertebrates

Conodonts
GenusSpeciesPresenceMaterialNotesImages
Amorphognathus A. ordovicicusLower part of the formation. [2] Also found in the Blue Mountain Formation.
Aphelognathus A. grandisUppermost lower and upper members. [2]
A. politusLower part of the formation. [2] Also found in the Blue Mountain Formation.
A. pyramidlisUpper member. [2]
Belodina B. confluensLower member at southern Georgian Bay. [2]
Coelocerondontus C. trigoniusLower part and Upper member of the formation. [2]
Decoriconus D. fragilisUpper member, Kagawong West Quarry. [2]
Drepanoistodus D. 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]
Icriodella I. prominensUpper member, Kagawong West Quarry. [2]
I. superbaLower part of the formation. [2]
Oulodus O. robustusUpper and lower members. [2]
O. ulrichiUpper member. [2]
O. undulatusUpper member. [2]
Ozarkodina O. aff. O. hassiUpper member, Kagawong West Quarry. [2]
Panderodus P. 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]
Paroistodus P. mutatusLower part of the formation. [2] Also found in the Blue Mountain Formation.
Periodon P. grandisLower part of the formation. [2] Also found in the Blue Mountain Formation.
Phragmodus P. undatusLower part and upper member of the formation. [2] Also found in the Blue Mountain Formation.
Plectodina P. inclinataUpper member at southern Georgian Bay. [2]
P. tenuisLower part and upper member of the formation. [2]
Pseudobelodina P. inclinataUpper member, Manitoulin Island. [2]
P. cf. P. kirkiUpper member, Manitoulin Island. [2]
P. microdentata Manitoulin Island. [2]
P. quadrataUpper member,Manitoulin Island. [2]
P. vulgaris vulgarisUpper member,Manitoulin Island. [2]
Pseudooneotodus P. beckmanniUpper member, Kagawong West Quarry. [2]
Rhipidognathus R. symmetricusUpper part of the formation. [2]
Staufferella S. falcataLower member at southern Georgian Bay. [2]
Walliserodus W. curvatusUpper member, Kagawong West Quarry. [2]
Zanclodus Z. sp.Upper member. [2]

Invertebrates

Arthropods
GenusSpeciesPresenceMaterialNotesImages
Orcanopterus O. manitoulinensisKangawong Submember, Manitoulin Island. [5] A eurypterid.
Orcanopterus.png
Brachiopods
GenusSpeciesPresenceMaterialNotesImages
Kinnella K. laurentianaLower Kagawong Submember. [6] An orthide.
Other animals
GenusSpeciesPresenceMaterialNotesImages
Curviconophorus C. andersoniScleritomous metazoan. [7]


See also

References

  1. 1 2 3 4 5 Stanley, D. C.A.; Pickerill, R. K. (1993-07-01). "Shallow marine Paleodictyon from the Upper Ordovician Georgian Bay Formation of southern Ontario". Atlantic Geology. 29 (2). doi: 10.4138/1994 . ISSN   1718-7885.
  2. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 Zhang, Shunxin; Tarrant, Glen A.; Barnes, Christopher R. (November 2011). "Upper Ordovician conodont biostratigraphy and the age of the Collingwood Member, southern Ontario, Canada1Earth Science Sector (ESS) Contribution 20100302". Canadian Journal of Earth Sciences. 48 (11): 1497–1522. doi:10.1139/e11-047. ISSN   0008-4077.
  3. ↑ Cao, Laifa; Peaker, S. M.; Ahmad, Shaheen; Sirati, A. (September 2014). "Engineering characteristic of Georgian Bay Formation in Toronto". GeoRegina. doi:10.13140/2.1.2400.5123.
  4. ↑ Christopher, D.; Stanley, A.; Pickerill, Ron K. (January 1994). "Planolites constriannulatusisp. nov. from the Late Ordovician Georgian Bay Formation of southern Ontario, eastern Canada" . Ichnos. 3 (2): 119–123. doi:10.1080/10420949409386379. ISSN   1042-0940.
  5. ↑ STOTT, CHRISTOPHER A.; TETLIE, O. ERIK; BRADDY, SIMON J.; NOWLAN, GODFREY S.; GLASSER, PAUL M.; DEVEREUX, MATTHEW G. (November 2005). "A NEW EURYPTERID (CHELICERATA) FROM THE UPPER ORDOVICIAN OF MANITOULIN ISLAND, ONTARIO, CANADA" . Journal of Paleontology. 79 (6): 1166–1174. doi:10.1666/0022-3360(2005)079[1166:anecft]2.0.co;2. ISSN   0022-3360.
  6. ↑ A., Stott, Christopher (2007). The earliest known Kinnella, an orthide brachiopod from the Upper Ordovician of Manitoulin Island, Ontario, Canada. OCLC   999203691.{{cite book}}: CS1 maint: multiple names: authors list (link)
  7. ↑ Rudkin, David M (1998). "A new scleritomous metazoan from the Late Ordovician Georgian Bay Formation, southern Ontario" . Canadian Journal of Earth Sciences. 35 (7): 827–831. doi:10.1139/e98-032. ISSN   0008-4077.


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