| 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 | |
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