The stone slab industry along the Savannah River at Stallings Island and at several locations along the Ogeechee River in Georgia began some time prior to the invention of fiber-tempered pottery, about 5000 years B.P. These sites are littered with drills for making slabs, broken slabs themselves, sherds of fiber-tempered pottery, and not much else. The industry ended shortly after people realized that clay pots tempered with sand or other non-organic materials could be placed directly into a fire.