Mass Trilobite Mortality Plate from the Wheeler ShaleThis very unique and rare Elrathia kingii trilobite mass mortality plate was found in the Wheeler Shale, House Range, Millard County, Utah. This plate not only has several partial and complete Elrathia kingii trilobites but also contains three Peronopsis instricta trilobites, over 20 imprints and also shows remnants of fossilized algae! This small plate measures approximately 4 1 2" wide by 4 1 2" tall. Stand and information cards (Peronopsis and