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USGS Geology in the Parks

Visual Glossary

Clasts Matrix This conglomerate is from North Cascades National Park
This conglomerate is from North Cascades National Park. The clasts (larger pieces of rock) are cobbles of granitic rocks (white with black speckles).


A sedimentary 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

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