 Southwestern
Ontario was shaped by advancing and retreating
glaciers during the last period of glaciation
about 15,000 years ago.
As the
ice melted, lakes and spillways formed between
the retreating glaciers creating the present
Thames river system.
The
moraines deposited by the glaciers covered the
underlying bedrock and became the hills bordering
and scattered throughout this watershed. The
bedrock is visible in only a few places such as
the limestone quarries at St.
Marys and Beachville.
Copyright: © Urban League of
London 1997
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