Very neat coral called Billingsastraea yandelli from the Devonian Period. It was found in the Jeffersonville Limestone of Jefferson County, Kentucky.
The holotype for this fossil is stored at The University of Michigan Museum of Paleontology which Erwin Stumm listed in 1964 as specimen #13877. I checked and it has not been cataloged in their on-line database yet.
Thanks to my cousin for loaning it to me so it could be photographed.