Pebble

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Sea wave polishing pebbles into rounded corners
Sea wave polishing pebbles into rounded corners
Pebbles
Pebbles
For other uses, see Pebble (disambiguation).

A pebble is a clast of rock with a particle size of 4 to 64 millimeters based on the Krumbein phi scale of sedimentology. A rock made predominately 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).

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