F684 Sample ID F684 • Cabinet M Elrathia Kingii 4.3cm W x 7.9cm H x 0.6cm D • 24g Sample TypeFossilFossil TypeAltered hard partsMohs Hardness 3 DomainEukaryotaKingdomAnimaliaPhylumArthropodaClassTrilobita OrderPtychopariidaFamilyAlokistocaridaeGenusElrathiaSpecieskingii Distribution/Period, Habitat PreservationCast Orig. Material?No ReliefPositive Mineral Comp.Shale Two small samples of Elrathia Kingii in a shale matrix. The larger sample was used in measurements. Black in color, with a positive relief. Description of Mohs scale here