﻿CONTENTS. 
  

  

  Page. 
  

  

  Introduction 
  9 
  

  

  Purpose 
  of 
  this 
  report 
  9 
  

  

  Acknowledgments 
  1 
  10 
  

  

  Previous 
  knowledge 
  of 
  the 
  geology 
  10 
  

  

  Early 
  history 
  of 
  the 
  district 
  11 
  

  

  Geography 
  and 
  topography 
  15 
  

  

  Location 
  15 
  

  

  Definitions 
  of 
  place 
  names 
  15 
  

  

  Relief 
  - 
  16 
  

  

  General 
  statement 
  16 
  

  

  San 
  Rafael 
  Mountains 
  17 
  

  

  Santa 
  Ynez 
  Mountains 
  18 
  

  

  Santa 
  Maria 
  Valley 
  19 
  

  

  Casmalia 
  Hills 
  19 
  

  

  Solomon 
  Hills 
  .' 
  20 
  

  

  Los 
  Alamos 
  Valley 
  21 
  

  

  Purisima 
  Hills 
  21 
  

  

  Burton 
  Mesa 
  22 
  

  

  Santa 
  Ynez 
  Valley 
  and 
  Santa 
  Rita 
  Hills 
  23 
  

  

  Terraced 
  coast 
  ~~ 
  23 
  

  

  General 
  topographic 
  features 
  24 
  

  

  Drainage 
  and 
  rainfall 
  25 
  

  

  Climate 
  and 
  vegetation 
  26 
  

  

  Geology 
  26 
  

  

  Sedimentary 
  formations 
  26 
  

  

  General 
  statement 
  26 
  

  

  Franciscan 
  formation 
  (Jurassic) 
  27 
  

  

  Knoxville 
  formation 
  (lower 
  Cretaceous) 
  28 
  

  

  Pre-Monterey 
  rocks 
  28 
  

  

  Tejon, 
  Sespe, 
  and 
  Vaqueros 
  formations, 
  undifferentiated 
  (Eocene- 
  

   Miocene) 
  29 
  

  

  General 
  statement 
  29 
  

  

  Lithologic 
  character 
  .' 
  30 
  

  

  Structure 
  and 
  thickness 
  31 
  

  

  Age 
  and 
  fossils 
  31 
  

  

  Monterey 
  shale 
  (middle 
  Miocene) 
  ." 
  33 
  

  

  General 
  statement 
  33 
  

  

  Lower 
  division 
  34 
  

  

  Upper 
  division 
  36 
  

  

  Diatomaceous 
  earth 
  deposits 
  38 
  

  

  Composition 
  of 
  the 
  Monterey 
  shale 
  39 
  

  

  Material 
  of 
  shale 
  39 
  

  

  Microscopic 
  appearance 
  43 
  

  

  Chemical 
  composition 
  44 
  

  

  Alteration 
  45 
  

  

  3 
  

  

  