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Abstract

Study Area

Table of Contents

CONTENTS

Page Abstract 1

Introduction 1

Location of the Rinconada fault 1

Purpose and scope 2

Acknowledgments 2

Major geologic relations of the Rinconada fault 2 

Nomenclature and definition 2

Regional relations  6

Concealed position of southwestern border of the Salinian block 8

Rock units 9

Crystalline rocks 9

Franciscan rocks 9 Upper Jurassic(?) and Cretaceous marine sedimentary sequence 12

Upper Cretaceous and lower Tertiary marine sedimentary sequence 12

Middle Tertiary sedimentary sequence 13

Upper Tertiary sedimentary sequence 16

Valley sediments  16

Surficial deposits 19

Segments of the Rinconada fault 19

Rinconada fault (Nacimiento segment) from San Rafael Mountains to Pozo area  19

Other faults near and possibly related to the Nacimiento segment of the Rinconada fault 20

Rinconada fault (Rinconada segment) from Rinconada mine to Paso Robles 21

Rinconada fault (San Marcos segment) from Paso Robles to San Antonio Reservoir 23

Rinconada fault (Espinosa segment) from San Antonio Reservoir to Reliz Canyon 25

Page Segments of the Rinconada fault Continued Relationship of Rinconada fault to Jolon and related faults 29

Geophysical expression of the Rinconada fault  32

Reliz fault 32

King City fault 32 Reliz fault in Arroyo Seco 33

Reliz fault at base of Sierra de Salinas 34

Possible northwestward extension of the Reliz fault 34

Regional evidence of large strike-slip movement on the Rinconada-Reliz fault zone 36

Movements in Quaternary time 36

Movements in Pliocene time 36

Movements since early Miocene time 36

Movements in Oligocenel?) time 38

Possible movements in pre-Late Cretaceous time 38

Strike-slip movement as suggested by configuration of buried surface of basement complex 40

Regional tectonics along and near the Rinconada-Reliz fault zone 40

Concepts of tectonic evolvement of the Coast Ranges 40

Tectonic pattern 42

Tectonic features of the east strip 44

Tectonic features of the west strip 44

Regional tectonic analysis 46

Regional significance of the Rinconada-Reliz fault zone 48

Effect of Rinconada-Reliz fault zone on physiography and drainage 52

Possible seismic activity 52

References cited 53