ANT 3 Study Guide - Final Guide: Oldowan, Chert
Document Summary
Chipping technology: probably the oldest of the two methods. The gona site in the hadar region of. Ethiopia has broken rocks interpreted as stone tools at 2. 6 million years. Chipped stone raw material properties: brittle, homogeneous structure to ensure predictability of fracture. Small grain structure microcrystalline or cryptocrystalline (e. g. , obsidian fractures to the nearest molecule: hard, to withstand use (e. g. , obsidian is about 5. 5 on moh"s hardness scale; chert is 6. 8) Fracture mechanics: given the material requirements, we can predict how a rock will break. If the material requirements are met, the stone will fracture conchoidally. Waves from the force of impact move through the stone in the same way waves move through water. The force moves through the stone in a cone shape. Ground stone technology: modifying stone without use of conchoidal fracture mechanics, percussion pecking, polishing, grinding simple grinding, sawing, drilling.
