Image: Placenticeratidae - Placenticeras whitfieldi
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Description: Fossil shell of ammonite Placenticeras whitfieldi showing punctures caused by the bite of a mosasaur. Fossil from Black Hills, South Dakota at Peabody Museum of Natural History, Yale
Title: Placenticeratidae - Placenticeras whitfieldi
Credit: Own work
Author: Hectonichus
Usage Terms: Creative Commons Attribution-Share Alike 3.0
License: CC BY-SA 3.0
License Link: http://creativecommons.org/licenses/by-sa/3.0
Attribution Required?: Yes
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