University of California Press University of California Press
Geology of the Pinnacles National Monument
CONTENTS

Cover

Introduction

Physical features.

Acknowledgments

Previous literature

Outline of geologic history

Metamorphic and plutonic rocks
   Gavilan limestone
   Santa Lucia "granite

Unmetamorphosed sediments
   Temblor
   Terrace deposits
   Recent

Volcanic rocks
   Rhyolitic intrusives
   Dacitic and andesitic intrusives
   Acid extrusives
   Basic extrusives
   Fragmental volcanic material
      Agglomerate
      Volcanic breccias
      Lapilli-tuff
   Age of the volcanic rocks

Mode of emplacement of the volcanic rocks
   Crumbling of a dome
   Intrusions
   Friction breccias
   Crumbling of advancing lava flows
   Vulcanian eruptions
   Pelan eruptions (nuées ardentes)
   Ultra-vulcanian eruptions
   Dry avalanches
   Conclusions

Areal distribution of breccias

Volume and thickness of volcanic material

Geologic structure
   Faults
      Miners Gulch fault
      Pinnacles fault
      Chalone Creek fault
   Joints

Historical geology

Economic geology



ILLUSTRATIONS

PLATES

1. Aerial view of the Pinnacles, looking toward the east
2. Aerial view in the direction of Chalone Mountain, looking toward the north

MAP

1. The Pinnacles National Monument: areal geology and sections (omitted from the online edition)

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Last Updated: 8-Jan-2007