| A pelecypod, resting atop its natural matrix, that invertebrate paleontologists assign to the genus-species Schizodus harii, from the Drum Limestone, Kansas City Group, Missourian Stage--306.5 to 305.5 million years old. Image courtesy Pennsylvanian Atlas of Ancient Life Midcontinent United States, under terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License. I edited and processed the photograph through photoshop. |