Geology in Ontario

Discover 8 places to experience unusual geology in Ontario.

Slate Islands shoreline.

Terrace Bay, Ontario

Slate Islands

This small archipelago in northern Lake Superior was formed by a massive meteorite impact 450 million years ago.

A canoe, two water serpents, and the great lynx Mishipeshu.

Agawa Bay, Ontario

Agawa Rock

A sacred Ojibwe site covered in pictographs next to Lake Superior.

Golden Jubilee graffito.

Golden Jubilee Graffito

Among the cliffs of the Elora Gorge is an oft-overlooked piece of celebratory graffiti.

Mazinaw Rock

Cloyne, Ontario

Mazinaw Rock

This water-locked cliff face is covered in hundreds of ancient pictographs.

The Yorkville Rock

Toronto, Ontario

The Yorkville Rock

This massive, ancient stone was disassembled and then put back together again.

(Flickr/Goldwin Guenther)

Tobermory, Ontario

Flowerpot Island

Little island known for its massive beachfront "flowerpot" pillars.

The badlands.

Caledon, Ontario

Cheltenham Badlands

These strikingly barren, rolling red hills were caused by bad farming practices.

Thunder Bay, Ontario

Sleeping Giant

Profile of a sleeping person 4km long in 250m high cliffs.

Port Colborne, Ontario

The Incredible Shrinking Mill

This mill on Lake Erie appears to shrink as a viewer approaches thanks to an optical illusion.

Are we missing something unusual in Ontario?