This is a very rare US trilobite. It is Paedeumias yorkensis from the Lower Cambrian of Pennsylvania. This specimen was found in York County, PA, not Lancaster, where most of the Kinzers Olenellids were found. The trilobite is very well preserved and has the LONG tailspine intact, which is quite unusual. This is a very fine example of a TRUE Paedeumias yorkensis from York County, Pennsylvania.