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Cobble (geology)

File:Lehigh conglom.jpg
A conglomerate, rock made of cobbles

A cobble is a clast of rock with a particle size of Script error: No such module "convert". to Script error: No such module "convert". based on the Krumbein phi scale of sedimentology. Cobbles are generally considered to be larger than pebbles (4 to 64 millimetres diameter) and smaller than boulders (greater than 256 millimetres diameter). A rock made predominantly of cobbles is termed a conglomerate.[1]

See also


  1. Folk, R.L. (1980) The Petrology of Sedimentary Rocks. Austin, Texas, Hemphill Publishing Company. 182 pp. ISBN 0-914696-14-9

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