Cobourg Limestone Explained

Cobourg Formation
Type:	Formation
Age:	Ordovician
Region:	Ontario
Country:	Canada

The Cobourg Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period. Technically the formation extends into New York State with Canadian section called Lindsay Formation. The formation was named by Raymond (1921). The Cobourg formation was estimated to have a total thickness of about 70 m.^[1]

Fossil found in the Cobourg Formation

• An example of a trilobite that lived during the Upper Ordovician, Flexicalymene croneisi. Found in 1941, in the Cobourg formation.^[2]

See also

• Colborne quarry: a limestone near Lake Ontario and is located in the Cobourg Formation.
• List of fossiliferous stratigraphic units in Ontario

References

• Web site: Fossilworks: Gateway to the Paleobiology Database. ((Various Contributors to the Paleobiology Database)). 8 July 2014.
• Various information of the Cobourg Formation and Colborne quarry. "FABRIC OF A MIDDLE ORDOVICIAN LIMESTONE AT COLBORNE, ONTARIO" Retrieved 9 February 2024.
• "Ordovician Trilobites of Canada (alphabetized)" Retrieved 9 February 2024.

Notes and References

1. Lee . P. J. . Winder . C. G. . 1967-06-01 . FABRIC OF A MIDDLE ORDOVICIAN LIMESTONE AT COLBORNE, ONTARIO . Canadian Journal of Earth Sciences . en . 4 . 3 . 529–540 . 10.1139/e67-028 . 0008-4077.
2. Web site: Ordovician Trilobites of Canada (alphabetized) . American museum of natural history.