Elrathia kingii Complete Trilobite Fossil 1 3/8"Authentic high quality 1 3 8" long Elrathia kingii Fossil Complete Trilobite on a piece of Wheeler shale. You will receive an approximate 1 3 8" long trilobite similar in quality to the pictures; however, the size of the shale piece and where the trilobite is located on the shale can vary, as seen in the pictures. Stand and Information Card Included. Genus: Elrathia Species: kingii Age: Middle Cambrian (505 million years) Location: House Range, Utah