File:Archaeocidaris, spiny sea urchin, Carboniferous (Pennsylvanian), Winchell Formation, Lake Brownwood Spillway, Texas, USA - Houston Museum of Natural Science - DSC01735.JPG
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current | 11:51, 8 February 2013 | 4,041 × 3,189 (4.57 MB) | Daderot |
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