Geologic image in the Kentucky Geological Survey data repository.Image Name: Laurel Dolomite Image Date: 9/16/2008 Category: photo_outcrop Source: Carey, Dan Format: JPG Size (MB): 4.93 Pixel Dimensions: 2816 x 2112 Description: Silurian Laurel Dolomite (Sl) at mile 19.0 on the Bluegrass Parkway shows the effects of chemical weathering. Rainwater combines with carbon dioxide in the air, forming weak carbonic acid, which moves downward through cracks and crevices. The process gradually dissolves the calcium carbonate and produces an irregular surface that may be filled in and covered by insoluble residuum composed of clay.