California Division of Mines and Geology: Bulletin 202 - Geology of the Point Reyes Peninsula, Marin County, California (Contents)

California Division of Mines and Geology

Bulletin 202
Geology of the Point Reyes Peninsula, Marin County, California

CONTENTS

COVER

Front Cover: Aerial view of western Marin County and Point Reyes.

ABSTRACT

INTRODUCTION

Geologic Story
Location and Extent of Area
Field Investigation and Mapping
Previous Geologic Work
Acknowledgments

GEOGRAPHY

Topography
Drainage
Climate
Vegetation

DESCRIPTIVE GEOLOGY

Metamorphic Rocks
   Areal Distribution
   Lithology
      Schist
      Limestone
   Stratigraphy
Granitic Rocks
   Areal Distribution
   Lithology
   Stratigraphy
Franciscan Rocks
   Areal Distribution
   Lithology
      Tectonic Inclusions
   Stratigraphy
Tertiary Rocks
   Paleocene
      Point Reyes Conglomerate
         Areal Distribution
         Lithology
         Stratigraphy
   Miocene
      Laird Sandstone
         Areal Distribution
         Lithology
         Stratigraphy
      Monterey Shale
         Areal Distribution
         Lithology
         Stratigraphy
      Other Miocene Rock Types
         Clastic Dikes
         Phosphatic Shales
         Extrusive Igneous Rocks
   Pliocene
      Drakes Bay Formation
         Areal Distribution
         Lithology
         Stratigraphy
      Merced Formation
         Areal Distribution
         Lithology
         Stratigraphy
Quaternary Rocks
   Pleistocene
      Millerton Formation
         Areal Distribution
         Lithology
         Stratigraphy
      Olema Creek Formation
         Areal Distribution
         Lithology
         Stratigraphy
      Terrace Deposits
         Marine Terraces
         Stream Terraces
      Boulders at Clam Patch
      Older Beach Deposits
      Sand Dunes

STRUCTURE

San Andreas Fault
   Width and Length
   Associated Faults and Fracture Traces
   Direction of the Movement
   Shutterridges
   Earthquakes and Creep
   Stream Diversion
Regional Structure
Local Structure
   Folds
   Faults

GEOMORPHOLOGY

Fault Zone
Older Topography
Marine Erosion
Bolinas Lagoon and Tomales Bay
Alluviated Valleys
Point Reyes Promontory
Landslides

GEOPHYSICAL SURVEYS

GEOLOGICAL HISTORY

PreCretaceous through Pleistocene

ECONOMIC GEOLOGY

Coal and Peat
Gold
Greensand
Limestone
Petroleum
Scheelite
Stone
Water Supply

A NOTE ON THE GEOLOGIC MAP

SUGGESTIONS FOR FUTURE RESEARCH

REFERENCES CITED

State of California
Edmund G. Brown, Jr.
Governor The Resources Agency
Huey D. Johnson
Secretary for Resources Department of Conservation
Priscilla C. Grew
Director Division of Mines and Geology
Thomas E. Gay, Jr.
State Geologist

ILLUSTRATIONS

Plate

1. Geologic map of Point Reyes Peninsula (omitted from the online edition)

Figures

1. Index map and generalized geologic map
2. Graph of mean daily atmospheric temperature
3. Type section of the Drakes Bay Formation
4. Variations of sea level during Ice Age
5. Diagrammatic sequential cross sections illustrating general geologic history of study area
6. Precipitation map

Tables

1. Mean daily atmospheric temperature
2. Surface water temperature
3. Mean monthly precipitation
4. Species of diatoms, Drakes Bay Formation
5. Species of diatoms, Drakes Bay Formation
6. Fossils from the Merced Formation
7. Fossil fauna of the Millerton Formation
8. Fossil flora of the Millerton Formation
9. Fresh water species of diatoms, Olema Creek Formation
10. Horizontal surface displacement, April 18, 1906
11. Analyses of limestone
12. Exploratory wells drilled to April 1, 1970
13. Low-flow characteristics of streams on Peninsula
14. Point Reyes Peninsula ranches and localities

Photographs

1. Aerial view of western Marin County and Point Reyes
2. Aerial view north toward Point Reyes
3. Metamorphic rocks in sea cliff near Kehoe Ranch
4. Point Reyes Conglomerate near Lighthouse
5. Laird Sandstone outcrop near Laird's Landing
6. Craggy Monterey chert outcrop near U—Ranch
7. Contorted Miocene cherts at Y—Ranch
8. Contorted Miocene cherts on Laguna Ranch
9. Duxbury reef
10. Impression of Pinnixa galliheri Rathburn
11. Bituminous sandstone dike in Monterey cherts
12. Basal sand of Drakes Bay Formation
13. Basal Pliocene glauconitic sand on Monterey chert
14. Diatoms from Drakes Bay Formation
15. Diatoms from Drakes Bay Formation
16. Merced Formation exposed in sea cliff
17. Olema Creek Formation
18. Olema Creek Formation
19. Diatoms from Olema Creek Formation
20. Bolinas—Drakes Bay terrace at mouth of Bear Valley
21. Aerial view of terraced surface
22. Older alluvial deposits exposed in road cut
23. Clam Patch
24. Older beach deposits
25. Older beach deposits on granitic surface
26. Mendoza syncline
27. Reverse fault in sea cliff
28. View south toward Drakes Bay and Limantour Spit
29. Landslides at Double Point
30. Miocene—Pliocene unconformity near U—Ranch

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Last Updated: 28-Nov-2007