A pebble is a clast of rock with a particle size of 4–64 mm (0.16–2.52 in) based on the Udden-Wentworth scale of sedimentology. Pebbles are generally considered larger than granules (2–4 mm (0.079–0.157 in) in diameter) and smaller than cobbles (64–256 mm (2.5–10.1 in) in diameter). 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.
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rock soil stonewall asphalt flooring gravel pebble cobblestone rubble sand floor boulder monochrome geology wall wood brick small white pebbles garden clast particle size 4–64 0 16–2 52 based udden-wentworth scale sedimentology generally considered larger granules 2–4 0 079–0 157 diameter smaller cobbles 64–256 2 5–10 1 diameter termed conglomerate tools earliest man-made artifacts dating palaeolithic period human history
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