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Joshua Tree National Park - Mojave Ecozone:
Geology Tour Road:

Stop #11

Debris Flows

Debris flow

Occuring at the mouth of this steep canyon in the Hexie Mountains, are irregular mounds of gneiss debris lacking a coating of patina. This lack of patina indicates more recent flows, not yet resulting in a debris fan. During heavy rains, the debris becomes saturated and oozes toward lower ground. As materials from higher up in the canyon wear down, a debris fan may develop, then possibly, over a long period of time an alluvial fan.

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GLOSSARY > alluvial fan, gneiss, patina

Also see:

Death Valley Geology: Alluvial Fans

Dumping debris: Eventually the rock-laden torrent reaches the narrow canyon mouth. Water rushes out of the canyon into ...
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