F119 Sample ID F119 • Cabinet M Eurypterus lacustris 8.23cm W x 1.73cm H x 6.37cm D • 120g Sample TypeFossilFossil TypeAltered hard partsMohs Hardness 2 DomainEukaryotaKingdomAnimaliaPhylumArthropodaClassEuchelicerata OrderEurypteridaFamilyEurypteridaeGenusEurypterusSpecieslacustris Distribution/PeriodWorldwide, Silurian HabitatMarine PreservationCarbonization Orig. Material?NA ReliefNeither Mineral Comp.Shale This is a flat fossil that only has the head and some small parts preserved. The two eyes are visible. Description of Mohs scale here