![File:Internal mold, Hormotoma, Mollusca, Gastropoda, Murchisonioidea - Iowa, USA.jpg](http://upload.wikimedia.org/wikipedia/commons/thumb/9/9e/Internal_mold%2C_Hormotoma%2C_Mollusca%2C_Gastropoda%2C_Murchisonioidea_-_Iowa%2C_USA.jpg/380px-Internal_mold%2C_Hormotoma%2C_Mollusca%2C_Gastropoda%2C_Murchisonioidea_-_Iowa%2C_USA.jpg)
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current | 10:35, 13 October 2013 | ![]() | 630 × 994 (169 KB) | 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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