Old Red Sandstone main content.

Old Red Sandstone

Part of Hall of Planet Earth.

Old Red Sandstone AMNH/R. Mickens

Exhibition Text

The sediments that formed both of the Old Red Sandstones were laid down in the same basin during the Devonian Period, about 400 million years ago. Although both samples were deposited around the same time, their surrounding environments were slightly different. Small differences in grain size and in the composition of the materials that cements the grains together a