Some of these images have a special cultural and/or religious significance for the societies that created them.The most important, but mysterious, type of petroglyph is the cupule - a non-functional cup-shaped hole created by percussion in the horizontal or vertical surface of a rock.When granite rock hardens, it freezes radioactive elements in place.The most common radioactive element in granite is Uranium-238.The term Oldowan is taken from the site of Olduvai Gorge in Tanzania, where the first Oldowan lithics were discovered by the archaeologist Louis Leakey in the 1930s.
Without the universal acceptance of the principle of evolution, there is no chance for the serious proposal of holism.
Classification of Oldowan tools is still somewhat contentious.
Mary Leakey was the first to create a system to classify Oldowan assemblages, and built her system based on prescribed use.
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