During the last ice age, this piece of Gowganda Tillite moved south ~450miles from Ontario near the northern shore of Lake Huron to a small farm field in Huron County, Ohio, moved with a mix of cobbles and boulders blended in with glacial clay that comprise the flat fertile farmlands of northwestern Ohio. Through successive years of plowing and tilling the land, as well as general uplift, this stone made its way to the surface of the field where it was struck by a plow and shattered into 97 fragments; lithological reduction by plow. Notice the embedded diorite clast in the top left segments of the stone.