Sedimentary rocks made of sand are often formed from a sandy beach, like the one in (A). Ripple marks form as water flows back and forth over the surface with each crashing wave. They are common on beaches and can be found in rock too. Do you see ripples in both the sandy beach (A) and the sandstone (B)? The sandstone in (B) was part of a beach over 200 million years ago when dinosaurs roamed the Earth.
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Both images courtesy of Martin Miller, University of Oregon and the Earth Science World Imagebank .
Last modified January 6, 2004 by Lisa Gardiner.
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