Norphlet Formation Sandstone

This image of a slabbed core of the Jurassic Norphlet sandstone shows distinctive striations. The clear demarcation separating the two sets of unidirectional lines indicates a change in angle of deposition of the sand that later formed the rock.

Close-up of a rock core showing layered bands in shades of brown and gray.
Reprinted by permission of Jim Lacefield
Close-up of a rock core showing layered bands in shades of brown and gray.