11.18.09

11.18.09 - Wednesday 1 Making Stone Tools or Lithic...

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Wednesday, November 18, 2009 1) Making Stone Tools or Lithic Technology a) Lithic is French for stone i) Subtractive technology b) It entails reducing a piece of raw material in size and shape to make a tool that is potentially useable for some task c) Reduction can be divided in two different approaches i) Chipping/flaking ii) Pecking/grinding 2) Chipping a) 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 b) These tools are crude and are known as Oldowan Tools c) How do we know that this is stone tool? i) The pattern exhibited in the locations where chips or flakes of stone have been removed d) In order to be chipped of flake a stone material must have the following properties i) Brittle ii) Homogeneous structure to ensure predictability of fracture iii) Small grain structure – microcrystalline or cryptocrystalline (e.g. obsidian fractures to the nearest molecule) iv) Hard (to withstand use) obsidian is about 5.5 on Moh’s hardness scale; Chert is 6.8
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11.18.09 - Wednesday 1 Making Stone Tools or Lithic...

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