Link to USGS home

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).

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

Use the back button on your browser to return to previous page.

Geology in the National Parks home | U.S. Department of the Interior | U.S. Geological Survey
Privacy statement / General Disclaimer
USGS Geology & Geophysics Webmasters
/parks/index.html
This page was last updated on 01/13/04

 FirstGov, 'Your First Click to the U. S. Government'