The rock fragments are rounded from being rolled along a stream bed or a beach during transportation. Excellent exposures of the Rockcastle occur at Cumberland Falls in Whitley County and along Pine Mountain. The Corbin Sandstone outcrops prominently at Natural Bridge in Powell County. Certain poorly cemented conglomerates may be crushed and used for the same purposes as unconsolidated sands and gravels. Levi Jackson State Park has a collection of millstones that are conglomerates and coarse sandstones that were used for grinding corn and wheat.
Sandstones are typically white, gray, brown, or red.
The red and brown sandstone is colored by iron oxide impurities. Sandstones are very resistant to erosion and form bluffs, cliffs, ridges, rapids, arches, and waterfalls. Sandstones and conglomerates are responsible for most of the rugged topography in eastern Kentucky. Loose or unconsolidated sands cover much of the Jackson Purchase area of western Kentucky. These sands are varicolored, but commonly white to light brown.