Geological Glossary

Glossary of common terms used in geology, and related to earth sciences.

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Conglomerate

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