Georgian Bay Formation
Georgian Bay Formation | |
---|---|
Stratigraphic range: Upper Ordovician (upper Maysvillian-lower Richmondian)[1] | |
Type | Formation |
Underlies |
|
Overlies | Blue Mountain Formation[2] |
Location | |
Region | ![]() ![]() |
Country | ![]() ![]() |
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
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
| Notes Uncertain or tentative taxa are in small text; |
Ichnotaxa
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
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
Arthropods | |||||
---|---|---|---|---|---|
Genus | Species | Presence | Material | Notes | Images |
Orcanopterus | O. manitoulinensis | Kangawong Submember, Manitoulin Island.[5] | A eurypterid. | ![]() |
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
References
- ^ a b c d e 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.
- ^ 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 ab ac ad ae af ag ah ai aj ak 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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) - ^ 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.
- Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 25 March 2022. Retrieved 17 December 2021.
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