This is a list of stratigraphic units in Ontario bearing fossils.
The Detroit River Group is a geologic group in Michigan and Ohio. It preserves fossils dating back to the Devonian period.
The Dundee Limestone is a geologic formation in Michigan, Ohio and Ontario. It preserves fossils dating back to the Devonian period.
The Williams Island Formation is a geologic formation in Ontario. It preserves fossils dating back to the Devonian period.
The Stooping River Formation is a geologic formation in Ontario. It preserves fossils dating back to the Devonian period.
The Kwataboahegan Formation is a geologic formation in the Moose River and Hudson Bay basins in northern Ontario, containing fossils from the Lower to Middle Devonian period. It is characterized by brown bituminous stromatoporoid-coral floatstone to bindstone and stromatoporoid-coral-crinoid wackestone-packstone-rudstones, interbedded with light grey, bioclastic wackestone-packstone.
The Hungry Hollow Formation is a geologic formation in Ontario. It preserves fossils dating back to the Devonian period. Remains of the Devonian polychaete Arkonips are known from this formation.
The Arkona Shale is a geologic formation in Ontario. It preserves fossils dating back to the Devonian period.
The Amherstburg Formation is a geologic formation in Ontario, Canada and Michigan, United States. It preserves fossils dating back to the Devonian period.
The Aberdeen Lake Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.
The Bobcaygeon Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.
The Ottawa Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.
The Lindsay Formation is a geologic formation in Ontario. It preserves fossils dating back to the Ordovician period.
The Williamsville Formation is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Dyer Bay Formation is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Ekwan River Formation is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Fossil Hill Formation is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Manitoulin Dolomite is a geologic formation in Ontario. It preserves fossils dating back to the Silurian period.
The Bad Cache Rapids Group is a geologic Group in Ontario. It preserves fossils dating back to the Ordovician period.
The Simcoe Group is a geologic group in Ontario. It preserves fossils dating back to the Ordovician period.
The Scarborough Formation is a Pleistocene geologic formation in Ontario.
