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A pebble is a grain or peice of of rock with a particle size of 4 to 64 millimeters based on the Krumbein phi scale of sedimentology that has been broken down from larger peices. It is generally described to be larger than gravel and smaller than cobble. A rock made predominantly of pebbles is termed a conglomerate. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. They have been found at Olduvai Gorge (1.85 million years ago[and at Longuopo in China (1.8 to 1.5 MYA ) http://en.wikipedia.org/wiki/Pebble

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17y ago

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