| Top--A pelecypod, resting atop its natural matrix, assigned to the genus-species Streblochondria hertzeri, from the Drum Limestone, Kansas City Group of the Missourian Stage (306.5 to 305.5 million years ago). Bottom--A pelecypod, resting atop its natural matrix, that invertebrate paleontologists assign to the genus-species Acanthopecten meeki, from the Cherryvale Shale, Kansas City Group, Missourian Stage--306.5 to 305.5 million years old. Images 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 photographs through photoshop. |