Over Michigan there was what is known as a continental ice sheet. A continental ice sheet is like a giant glacier. These extend all the way from the poles to the lower latitudes. Continental ice sheets can only occur during periods of extended cold. They are extremely large but still act like normal glaciers. Ice sheets still move along the land by the power of gravity. Along the way the glacier picks up very large boulders which are dragged along by the glacier and cut deep into the earth’s surface. “Common all over the world, glaciated valleys are probably the most readily visible glacial landform. Similar to fjords, they are trough-shaped, often with steep near-vertical cliffs where entire mountainsides were scoured by glacial movement. One of the most striking examples of glaciated valleys can be seen in Yosemite National Park, where glaciers literally sheared away mountainsides, creating deep valleys with vertical walls.”
Over Michigan there was what is known as a continental ice sheet. A continental ice sheet is like a giant glacier. These extend all the way from the poles to the lower latitudes. Continental ice sheets can only occur during periods of extended cold. They are extremely large but still act like normal glaciers. Ice sheets still move along the land by the power of gravity. Along the way the glacier picks up very large boulders which are dragged along by the glacier and cut deep into the earth’s surface. “Common all over the world, glaciated valleys are probably the most readily visible glacial landform. Similar to fjords, they are trough-shaped, often with steep near-vertical cliffs where entire mountainsides were scoured by glacial movement. One of the most striking examples of glaciated valleys can be seen in Yosemite National Park, where glaciers literally sheared away mountainsides, creating deep valleys with vertical walls.”