Elrathia is a genus of trilobite species that lived during the Middle Cambrian of Utah, and possibly British Columbia. E. kingii is one of the most common trilobite fossils in the USA locally found in extremely high concentrations within the Wheeler Formation in the U.S. state of Utah. E. kingii has been considered the most recognizable trilobite. Commercial quarries extract E. kingii in prolific numbers, with just one commercial collector estimating 1.5 million specimens extracted in a 20 year career. 1950 specimens of Elrathia are known from the Greater Phyllopod bed, where they comprise 3.7% of the community.
Species: Elrathia (Trilobite) Age: Paleozoic Era - 251 million yrs Location: Utah, USA Size: 3.5 x 3 inches, 1in trilobite Weight: 184.7 grams