California Geological Survey California Division of Mines
Special Report 68
Igneous and Metamorphic Rocks of the Western Portion of Joshua Tree National Monument, Riverside and San Bernardino Counties, California

CONTENTS
Cover
Cover: Towering piles of granite (weathered and jointed White Tank quartz monzonite) in Joshua Tree National Monument. Photo courtesy National Park Service.
Preface
Abstract
Introduction
Previous work
Lithology
   Pinto gneiss
   Gold Park gabbro-diorite
   Palms quartz monzonite and monzonitic porphyry
   White Tank quartz monzonite
   Granodiorite
   Dikes
   Basalt
Summary of structural features
Geologic history
References


ILLUSTRATIONS
Plate 1. Geologic map of the western portion of Joshua Tree National Monument

Figure 1. Index map

Photo 1. View east across Lost Horse Valley toward the Lost Horse Mountains
Photo 2. View south across Indian Cove Campground
Photo 3. Wonderland of Rocks; view northwest from Lost Horse Mountain
Photo 4. Photomicrograph of Pinto gneiss
Photo 5. Photomicrograph of Gold Park gabbro-diorite
Photo 6. Photomicrograph of Unit A of Palms quartz monzonite
Photo 7. Photomicrograph of Unit B of Palms quartz monzonite
Photo 8. Photomicrograph of Unit C of Palms quartz monzonite
Photo 9. Photomicrograph of monzonitic porphyry
Photo 10. Photomicrograph of White Tank quartz monzonite
Photo 11. Photomicrograph of White Tank quartz monzonite
Photo 12. Photomicrograph of White Tank quartz monzonite
Photo 13. Cap Rock, view east
Photo 14. Typical bouldery exposure of weathered White Tank quartz monzonite, near Lost Horse Well
Photo 15. Photomicrograph of silicic dikes
Photo 16. Aerial view east across Malapai Hill

STATE OF CALIFORNIA
EDMUND G. BROWN, Governor

DEPARTMENT OF NATURAL RESOURCES
DeWITT NELSON, Director

DIVISION OF MINES
IAN CAMPBELL, Chief




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Last Updated: 18-Jan-2007