B. Geology  

Pre-Glacial

 The pre-glacial geology of the Darby Watershed is for the most part buried under glacial deposits and has little impact on the modern drainage of the watershed.  Through several geologic periods several warm, shallow seas advanced and retreated over the Ohio landscape (National Park Service, 1993).  During the Silurian and Devonian periods (435-345 million years ago) a retreat of a sea deposited a thick layer of carbonate sediments which are now important in Ohio ’s lime industry (National Park Service, 1993). 

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Last updated: August 18, 2008.