It has been found that instrumented indentation of a solid material can directly determine many bulk material properties. Micro scale indentations were preformed on blue mussel (Mytilus Edulis) shells. The outermost layer, the peristrom, is very thin and does not regenerate, raising the question of how the impact forces it receives in vivo are mitigated. The mollusk has two discreet areas, the old growth area and a small protrusion of new growth. The reduced young’s modulus, plastic work and creeping were studied on both areas by systematically changing indentation depth, speed, and time held at max load.