National Park Service LogoU.S. Department of the InteriorNational Park ServiceNational Park Service
National Park Service: U.S. Department of the InteriorNational Park Service Arrowhead
 
 
Support the National Park Service
Pinnacles National MonumentA bridge along the Old Pinnacles Trail
view map
text size:largestlargernormal
printer friendly
Pinnacles National Monument
Natural Features & Ecosystems

natural features & ecosystems includes:

Geology
Cave / Karst Systems
Faults
Geologic Formations
 
 
Flashlights are required in the cave.
The Balconies Cave is a narrow canyon with a roof of talus.

Pinnacles National Monument gets its name from rock spires and crags that are remnants of an ancient volcano. The volcano eroded over millions of years as it moved northward along the San Andreas Fault. Rock debris in the form of boulders has weathered and settled, leaving behind spires of volcanic rock and talus caves.

A Portrait of President Theodore Roosevelt  

Did You Know?
Pinnacles, Muir Woods, and the Grand Canyon were all set aside as national monuments in the span of seven days in January 1908 by Teddy Roosevelt.

Disclaimer Accessibility Privacy Policy FOIA Notices USA.gov

Last Updated: December 20, 2006 at 16:44 EST