Maine Geological Survey: Bedrock Geology Maps
The literal foundation of Maine is its bedrock. Bedrock is the solid, intact part of the earth's crust, the outer layer 20 to 25 miles thick that rests on the earth's mantle. ... Whereas parts of southern Arizona or Louisiana may have thousands of feet of unconsolidated surficial material overlying bedrock, the "depth to bedrock" in Maine is ...
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