Precambrian Contract and Midcontinent Rifting

Contact: Dave Harris

This diagram represents the interpreted geologic evolution of the Precambrian. Episodes of pulling apart (extension) when basins were formed are interrupted by periods of pushing together (contraction) when the basins were folded and faulted by mountain-building processes. "Ma" means millions of years ago.

Evolution of Precambrian

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© 2000 Kentucky Geological Survey, University of Kentucky
Created 4-Aug-2000