Ripple Marks In Sandstone
Ripple marks are sedimentary structures preserved in sandstone and limestone. They may be asymmetrical in shape, with the steep side pointing downstream in the direction of current flow. In this picture the steep side is toward the viewer and so is the current direction. Ripples form naturally by the movement of water currents in rivers and streams, on beaches of tidal and long-shore currents, and in deep-ocean basins. This picture was taken of Ordovician age sandstone in the Everton Formation along Beaver Lake.