pebble

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住所: 北沢2-14-1 Setagaya , Tokyo Japan
電話番号: +81 3-3410-7590

特徴

Outdoor Seating: No

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 and smaller than cobbles. Pebble tools are among the earliest known man-made artifacts, dating from the Palaeolithic period of human history. (Wikipedia)