Geologic image in the Kentucky Geological Survey data repository.Image Name: Image Date: 1/1/2001 Category: photo_outcrop Source: Potter, Paul Format: JPG Size (MB): 0.81 Pixel Dimensions: 2066 x 1692 Description: Shallow channel in St. Louis Limestone along Cumberland Parkway just west of Somerset, Pulaski Co., Ky. The author believes that such symmetrical channels, whether in carbonate rocks (here) or in clastic rocks are of tidal or marine origin.