File:Sthenarocalymene celebra - Arthropoda, Trilobita, Polymerida, Calymenidae - Silurian - Ohio, USA.jpg
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![File:Sthenarocalymene celebra - Arthropoda, Trilobita, Polymerida, Calymenidae - Silurian - Ohio, USA.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/6/63/Sthenarocalymene_celebra_-_Arthropoda%2C_Trilobita%2C_Polymerida%2C_Calymenidae_-_Silurian_-_Ohio%2C_USA.jpg/800px-Sthenarocalymene_celebra_-_Arthropoda%2C_Trilobita%2C_Polymerida%2C_Calymenidae_-_Silurian_-_Ohio%2C_USA.jpg)
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 00:27, 27 May 2013 | ![]() | 3,008 × 2,000 (3.31 MB) | Jacopo Werther | {{Information |Description=Many fossils of shelly organisms (e.g., bivalves, gastropods, brachiopods, cephalopods) have had the original hard parts dissolved away. In such cases, the fossil itself is an impression of the outside of the shell (external... |
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