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 .
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The Fall 2010 issue of The Earth Scientist
, focuses on rocks and minerals, including articles on minerals and mining, the use of minerals in society, and rare earth minerals, and includes 3 posters!
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