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Millbrig Bentonite in limestone succession (Upper Ordovician, 454 Ma; Warren County core, Ohio, USA) 4.jpg - Jsj1771
Dolostone (Knox Dolomite, Upper Cambrian; Warren County core, Ohio, USA) 4.jpg - Jsj1771
Mt. Simon Sandstone (Middle Cambrian; Warren County core, Ohio, USA) 15.jpg - Jsj1771
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