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Table of Contents - Special Paper 391

Net Dextral Slip, Leogen San Gregorio — Hosgri Fault Zone, Coastal California: Geologic Evidence and Tectonic Implications

Edited by: William R. Dickinson, Mihai Ducca, Lewis I. Rosenberg, H. Gary Greene, Stephan A. Graham, Joseph C. Clark, Gerald E. Weber, Steven Kidder, W. Gary Ernst, and Earl E. Brabb


Abstract 1
Introduction 2
Tectonic Setting 3
Slip Rate over Time 5
Course of Fault 5
San Gregorio Segment 5
Monterey Bay Segment 5
Big Sur Segment 9
San Simeon Segment 11
Hosgri Segment 13
Offset Nacimiento Fault 13
Cross-Fault Contrasts 13
Nature of Faulting 14
Regional Relations 14
Nacimiento Piercing Points 16
Big Creek Enclave 16
Shell Well Core 17
Alternate Piercing Points 19
Pigeon Point–Atascadero Correlation 20
Supportive Tertiary Exposures 20
Tectonic Reconstructions 21
Northern Salinian Block 21
Point Sur Franciscan Block 23
San Simeon and Point Sal 25
Regional Problems 25
Gualala Block Problem 25
Gualala Block Position 27
Gualala Stratal Relations 27
Gualala Fault Sliver 28
Alternate Gualala Restoration 28
Pilarcitos Fault Relations 30
Gualala Block Slip 30
Proto–San Andreas Question 31
Intra-Salinian Deformation 33
Tularcitos Saddle 33
Santa Lucia Transpression 36
Distributive Strike Slip 36
General Conclusions 36
Acknowledgments 37
References Cited 37