Have you ever heard of the Canadian Shield?
|Photo Credit: Dana Stephenson|
The Canadian Shield is the name for a large area of exposed bedrock. The Georgian Bay Biosphere Reserve is on part of the Canadian Shield, which is why there are such interesting and unique landscapes! Rock formations and landforms like the ones in these pictures are typical of the Canadian Shield.
|Photo Credit: Tianna Burke|
The story of these rocks starts a long time ago. Over one billion years ago (that’s 1,000,000,000 years!) this area was covered in tall mountains called the Grenville Mountains. But where did they go?
|deanspic – Example of rock erosion|
Large sheets of ice called glaciers once covered Ontario. These glaciers were like gigantic ice cubes one kilometer high! Due to the glacier’s weight and slow movement, the ice carried away a lot of rock and soil, exposing and smoothing out the bedrock into what it looks like now.
The Shield is made of hard rocks like granite. However, Eastern Georgian Bay is made up mostly of gneiss (pronounced ‘nice’). Gneiss and granite are similar, but gneiss has bands or stripes in it.
Can you see the different layers in the picture below? Which minerals do you think are there?