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View of a portion of J.C. Reed’s (2004) Geologic Map of North America, showing Precambrian bedrock and Paleozoic sedimentary cover in the upper Midwest

By Geosciences and Environmental Change Science Center December 2004 (approx.)
Precambrian bedrock and Paleozoic sedimentary cover in the upper Midwest
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Detailed Description

View of a portion of J.C. Reed’s (2004) Geologic Map of North America, showing Precambrian bedrock and Paleozoic sedimentary cover in the upper Midwest. At 1:5 million scale, this is the most detailed seamless map of bedrock geology in the United States. Synthesizing nationwide geology in greater detail is a challenge for the coming decade.

Sources/Usage

Public Domain.