 Between eastern Jasper County and Bass Lake, the area is generally sand covered, with a broad low ridge running from the north end of the Iroquois moraine at San Pierre to North Judson.This ridge has patches of boulders in the till line from North Judson to Bass Lake, as do many other moraines in northern Indiana.The moraine from Bass Lake runs to the southeast and was formed by the Saginaw lobe, of the Laruentide glacier and is the outer border of the great Maxinkuckee moraine.