List of fossiliferous stratigraphic units in Ontario

Group or Formation	Period	Notes
Aberdeen Lake Formation	Ordovician
Amherstburg Formation	Devonian
Arkona Formation	Devonian
Arkona Shale	Devonian
Attawapiskat Formation	Silurian
Bad Cache Rapids Group/Surprise Creek Formation	Ordovician
Bertie Group/Williamsville Formation	Silurian
Black River Group/Bobcaygeon Formation	Ordovician
Black River Group/Ottawa Formation	Ordovician
Bobcaygeon Formation	Ordovician
Cabot Head Formation	Silurian
Cobourg Formation	Ordovician
DeCew Formation	Silurian
Detroit River Group/Lucas Formation	Devonian
Don Beds Formation	Canada
Dyer Bay Formation	Silurian
Ekwan River Formation	Silurian
Eramosa Formation	Silurian
Farr Formation	Ordovician
Fossil Hill Formation	Silurian
Gasport Formation	Silurian
Georgian Bay Formation	Ordovician
Goat Island Formation	Silurian
Guelph Formation	Silurian
Gull River Formation	Ordovician
Hamilton Group/Hungry Hollow Formation	Devonian
Irondequoit Limestone Formation	Silurian
Kettle Point black Shale	Devonian
Kwataboahegan Formation	Devonian
Lockport Formation	Silurian
Long Rapids Formation	Devonian
Lowville Formation	Ordovician
Manitoulin Formation	Silurian, Ordovician
Meaford Formation	Ordovician
Medina Group/Power Glen Formation	Silurian
Missinabi Formation	Canada
Murray Island Formation	Devonian
Nottawasaga Group/Georgian Bay Formation	Ordovician
Nottawasaga Group/Whitby Formation	Ordovician
Ohio Shale	Devonian
Onondaga Formation	Devonian
Ottawa Formation	Ordovician
Ottawa Group/Lowville Formation	Ordovician
Oxford Formation	Ordovician
Pamelia Formation	Ordovician
Power Glen Formation	Silurian
Power Glen Shale	Silurian
Queenston Formation	Ordovician
Rochester Shale	Silurian
Scarborough Formation	Canada
Sextant Formation	Devonian
Simcoe Group/Bobcaygeon Formation	Ordovician
Simcoe Group/Gull River Formation	Ordovician
Simcoe Group/Lindsay Formation	Ordovician
Simcoe Group/Verulam Formation	Ordovician
St. Edmund Formation	Silurian
Stooping River Formation	Devonian
Thorold Formation	Silurian
Trenton Group/Cobourg limestone Formation	Ordovician
Trenton Group/Sherman Fall limestone Formation	Ordovician
Verulam Formation	Ordovician
Williams Island Formation	Devonian

References

• Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Retrieved 10 July 2014.