Conglomerate (geology)

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. Both conglomerates and breccias have clasts larger than sand (>2 mm).