Geologic image in the Kentucky Geological Survey data repository.Image Name: Silurian Limestone, Allen County Image Date: 5/8/2007 Category: photo_outcrop Source: Carey, Dan Format: JPG Size (MB): 4.33 Pixel Dimensions: 2816 x 2112 Description: Silurian Louisville Limestone exposed along Ky. 100 near the Barren River in Allen County.