Ontario's Historical Plaques 

Discover Ontario's history as told through its plaques

2004 - Now in our 14th Year - 2018

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Glacial Terraces

Glacial Terraces

Photo by contributor Thomas William Kirkbride - Posted June, 2006

Glacial Terraces

Photo from Google Street View ©2011 Google - Posted March, 2011

Plaque Location

The District of Thunder Bay
The Township of Terrace Bay
In Terrace Bay, on the south side of Highway 17
across from Simcoe Plaza
1.0 km east of the Aguasabon River bridge

Coordinates: N 48 46.895 W 87 06.134


Plaque Text

About 20,000 years ago Ontario was covered by a great glacier, the fourth glaciation in this region within the past million years. The meltwaters from these gigantic ice-sheets filled the Lake Superior basin and progressively developed new drainage patterns which gradually lowered the level of the lake. As the waters receded from old shorelines more recent lake deposits where exposed and new shorelines established. This process produced a succession of terraces, separated from one another by escarpments or shore cliffs formed by wave erosion. Flat terraces, composed mainly of sand and gravel deposits, are found at various places around the Lake Superior shoreline and their prominence gave Terrace Bay its name.



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