Outcrop showing contact between the uranium-rich Huron Member of the Ohio Shale with overlying till of Wisconsinan age along the Lake Erie shoreline at Showse Park, Vermilion, Lorain County, Ohio. Pleistocene glaciers eroded large amounts of Ohio Shale and incorporated these fragments in tills. Note vertical cracks in the till. These fissures provide avenues for upward migration of radon. Unit lithology in this area is shale, siltstone, and sandstone. Bedrock is from the Devonian Geologic Period. Ohio Geological Survey employee Merrianne Hackthorn is pictured next to the outcrop for scale. The photograph was taken by David B. Buchanan probably in April 1983.
