NPS home USGS home USGS/NPS banner

Devils Postpile National Park Geologic Story

horizontal bar
Distribution of Volcanic Rocks of Devils Postpile and Vicinity

images on the way.
Geology by DAVID W. CLOW and KENNETH R. COLLUM, 1983
Modified from N. K. HUBER and C. D. RINEHART and R. P. KOEPPEN. Base map by U.S. Geological Survey.


  • Undifferentiated surface deposits, including: pumice, stream deposits, recent organic soils.
  • Basalt of the Red Cones. Unglaciated red cinder Cones and lava flows.
  • Basalt of the Devils Postpile. Dark gray, fine-grained basalt flow, with abundant feldspar crystals.
  • Andesite of Mammoth Pass. Light gray to dark gray, fine-grained andesite, with minor feldspar and pyroxene crystals.
  • Rhyodacite of Rainbow Falls. Light gray, fine-grained rhyodacite, with minor oxyhornblende crystals. Exhibits horizontal to semi-horizontal platy weathering fractures. Some dense, black, columnar-jointed outcrops.
  • Tuff of Reds Meadow. Similar to Bishop Tuff. Buff, ash-flow rhyolite exhibiting welding of pumice with abundant quartz, feldspar, and rock fragments.
  • Basalt of The Buttresses. Dark gray basalt, with abundant olivine crystals, and minor pyroxene. Crude columnar jointing.
  • Contact, as mapped by Clow and Collum (1983).
  • Contact, volcanic units as mapped by Huber and Rinehart (1965; 1967).
  • - Monument boundary.

Continue to Summary of Glacial and Volcanic History
Return to beginning

| Devils Postpile geology home | Devils Postpile National Monument home |
| Locate Devils Postpile |

horizontal bar
| USGS Geology in the Parks home | NPS Park Geology Tour home |

This site is a cooperative endeavor of the
US Geological Survey Western Region Geologic Mapping Team
and the National Park Service.
Please share your comments and suggestions with us!
This page was last updated on 9/7/00
spacer image

Material in this site is adapted from a pamphlet, Devils Postpile Story, by N. King Huber, USGS, and Wymond W. Eckhardt, NPS. It is published by Sequoia Natural History Association, Sequoia Natural History Association, HCR-89, PO Box 10, Three Rivers, CA 93271-9792, Telephone (559) 565-3759