Lexicon

Conglomerate

A sedimentary rock rock made of rounded rock fragments, such as pebbles, cobbles, and boulders, in a finer-grained matrix. To call the rock a conglomerate, some of the consituent pebbles must be at least 2 mm (about 1/13th of an inch) across.

Conglomerates on the slopes of the Blue Mesa badlands, Petrified Forest National Park