GeoPic Of The Week: Ripple Marks In Sandstone

Ripple Marks In Sandstone

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.


4 thoughts on “GeoPic Of The Week: Ripple Marks In Sandstone

  1. edward clifton

    I am a retired geologist living in Monterey, California, who regularly writes an article in InterpNEWS, a free online publication that is disseminated to a large global audience of persons who interpret the natural world. It is my way of trying to expand an understanding and appreciation of geology to the layperson. My next article is on the recognition and interpretation of bedforms, and I would love to utilize the spectacular photograph of the Everton Fm. ripples shown in your website. I would, of course, give them full attribution.

    Ed Clifton

    1. argeology Post author

      Yes, I spoke to Angela Chandler and she said it would be okay if you used her photograph in your article. Just attribute it to the Arkansas Geological Survey. Thanks for your interest!

      Richard Hutto

  2. Peggy

    I have one of these ripple rock but it glitters and is very heavy maybe it has zinc it seems rare. There our chunks you can hold in your hand and pieces broke off. It has a rust appearance my husband thinks it is zinc due to weight with little tiny crystals. How rare is this in Arkansas? Is there a value in pounds just curious not wanting to mine it? There is a picture of rock toward the bottom of my ghost hunting site.


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