Geology & Formations

Enjoy MacGregor Point's exciting geologic history while you camp!  The shoreline is an excellent place to search for interesting rocks.  Want to learn more about a particular rock you found?  Why not bring it to the Visitor Centre staff and they'll do their best to help you learn more about it.  Just remember, because MacGregor Point is a natural environment provincial park protected by the Provincial Parks and Conservation Reserves Act (PPCRA), you may not remove rocks from the park.   

Post Glacial Lakes

Lake Algonquin: formed approximately 10,000 years ago

Lake Stanley: formed approximately 7,500 years ago

Lake Nipissing: formed approximately 5,000 years ago

Lake Huron: Now

The Huron Fringe

The Huron Fringe is a series of wetlands, just inside of the shoreline of Lake Huron that extends from Tobermory to Sarnia. These wetlands were formed by the shorelines of the glacial lakes, whose soil doesn’t allow for drainage of water back into Lake Huron. The Huron Fringe is an important migratory route for birds traveling both north and south during the migration seasons and is home to many important wetland species.

Bois Blanc

The park includes approximately 7km of Lake Huron shoreline.  Rugged stones and boulders characterize this feature, short stretches of sandy beach, low sand dunes, and several shoreline wetlands.  Each of these habitats is home to a unique community of flora and fauna, including at least 10 provincially rare plant and animal species.  Sunsets along this stretch of shoreline are spectacular - drawing thousands of visitors to the area each year. The shoreline also has considerable value as a source for fossils and rock formations that demonstrate landform change over geologic time.  Of particular importance is an outcropping of dolostone from the Bois Blanc period – making MacGregor Point one of only a handful of locations along the western shoreline of Lake Huron where this formation can be seen.  This outcropping can be found at the ‘Dog Beach’ near the Huron campground.


The Geology of MacGregor, A Poem by Kate Little

400 million years ago this place was a sea,

The earth went through cycles and started to freeze.

The glaciers advanced, grew out from the North,

And spent a long while moving back and forth.

Over 1 million years this ice sheet sat here,

But 10,000 ago, it disappeared

Ice left water behind in big glacial lakes

Every now and again, melting hit the brakes

Lake Algonquin was first to cover this land

It made a shoreline of clay, gravel and sand

Next Nipissing sat here for a spell

It made a gravelly shoreline as well

Algoma was last, it wasn’t here long

Water kept receding back where it belonged

To our big lake, Great Lake Huron

The last glacial lake, but now let’s move on

The shorelines are barriers for water draining out

It sits in depressions, gathers, hangs about

These shorelines and water formed wetlands you see

The wetlands around us which forever will be

A home to great creatures both big and small

And it all goes back to when Earth was a snowball.