Calymene celebra Silurian Trilobite from lllinois

Calymene celebra is a Calymenid trilobite (Order: Phacopida; Family: Calymenidae) coming from the Silurian dolomitic limestone of Grafton, Illinois. The species has been assigned to several different genenera over the past century; Calymene, Flexicalymene, Gravicalymene, and Sthenocalymene. Calymene celebra was chose as the state fossil of Wisconsin in 1985, and it occurs over a wide area in the Midwest US. Dolomitic limestone preserves details of the trilobite, but not quite as impressively as Calcite. To see an example of Calymene clavicula, see my other offerings. This one is well-displayed on a large matrix block that has been painstakingly prepared to free it from its rocky tomb.