This crab fossil is half of a concretion (nodule of rock that forms around organic manner) with a crab fossil encased in the center. It eroded out of the Lincoln Creek Formation, found in Grays Harbor County on the Olympic Peninsula coast of Washington state. Very rare — we haven’t been able to get these for over 30 years! Species Pulalius vulgaris, Late Eocene Epoch, approx. 38 – 34 million years old. Approx: 1 7/16″ H x  1 5/8″ W x 7/8″ D;   1.4 oz Need a stand? We have a variety of display stands here.