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Conglomerate (geology)

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Carmelo Formation (Conglomerate) at Point Lobos, California
Puddingstone outcrop
A puddingstone: pebbles from a former beach cemented by silica.

A conglomerate is a rock consisting of individual clasts within a finer-grained matrix that have become cemented together.

Conglomerates are sedimentary rocks consisting of rounded fragments and are thus differentiated from breccias, which consist of angular clasts.[1] Both conglomerates and breccias have clasts larger than sand (>2 mm).


  1. "Conglomerate Rocks." Conglomerate Rocks on Rock Hound. Rock Hounds. Retrieved on July 29, 2007.