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USGS Geology in the Parks

Visual Glossary

Mosaic Canyon breccia This breccia is found in Death Valley's Mosaic Canyon. Photo by Ray Nordeen, NPS.

Breccia

Breccia is a coarse-grained sedimentary rock made up of broken rock fragments with relatively sharp corners. These large, angular fragments are cemented by a fine-grained matrix or mineral cement.

 

 

 

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