This trilobite tail, also known as a pygidium was embedded in Brush Creek Limestone. By the Carboniferous, trilobites were on the decline, and evolution was making them smaller and smaller. Only the order Proetida survived into the Carboniferous, and later died out at the end of the Permian. It would
The genus Edmondia was first described by de Koninck in 1841. The book is Description des animaux fossiles qui se trouvent dans le terrain carbonifére de Belgique, written in the French language. The genus occurs from 252.3 to 457.5 million years ago. It died out during the Permian–Triassic extinction event.
I’m not certain on the genus and species. I’ve considered Meekopinna Americana and Aviculopinna peracuta as possibilities. However, upon reading an article from the Journal of Paleontology, the entire family is in need of some clarification. We understand, however, that the Paleozoic Pinnidae are in need of a complete reinvestigation;