: Paléoclimatologie: pebble

study material > rock > detrital rock > pebble

pebble

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). Pebbles come in various colors and textures and can have streaks, known as veins, of quartz or other minerals. They are mostly smooth but, dependent on how frequently they come in contact with the sea, they can have marks of contact with other rocks or other pebbles. Pebbles left above the high water mark may have growths of organisms such as lichen on them, signifying the lack of contact with seawater. A rock made predominantly of pebbles is termed a conglomerate (Adapted from: https://en.wikipedia.org/wiki/Pebble)

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