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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
PrefaceCover: Towering piles of granite (weathered and jointed White Tank quartz monzonite) in Joshua Tree National Monument. Photo courtesy National Park Service.
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
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