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In petrology, lithified sedimentary rock consisting of rounded fragments larger than 0.08 in. (2 mm) in diameter. It is commonly contrasted with breccia. Conglomerates are usually subdivided according to the average size of their constituent materials into pebble (fine), cobble (medium), and boulder (coarse).
This entry comes from Encyclopædia Britannica Concise. For the full entry on conglomerate, visit Britannica.com.