﻿GEOLOGY. 
  

  

  27 
  

  

  standard 
  California 
  section 
  and 
  with 
  that 
  of 
  Santa 
  Clara 
  Valley, 
  Ven- 
  

   tura 
  County: 
  

  

  Tentative 
  correlation 
  of 
  formations 
  of 
  Santa 
  Maria 
  district 
  with 
  the 
  standard 
  California 
  

   Coast 
  Range 
  section 
  and 
  with 
  that 
  of 
  the 
  Santa 
  Clara 
  Valley. 
  

  

  Era. 
  

  

  Sys- 
  

   tem. 
  

  

  Period. 
  

  

  Standard 
  Coast 
  Range 
  

   section. 
  

  

  Santa 
  Maria 
  district 
  

   section. 
  

  

  Santa 
  Clara 
  Valley 
  

   section. 
  

  

  Cenozoic. 
  

  

  Quaternary. 
  

  

  Recent. 
  

  

  Alluvium. 
  

  

  Alluvium. 
  

  

  Alluvium. 
  

  

  Pleistocene. 
  

  

  San 
  Pedro. 
  

  

  Terrace 
  deposits 
  and 
  

  

  dune 
  sand. 
  

   Unconformity 
  

  

  Fernando. 
  

  

  Unconformity 
  

  

  Monterey. 
  

  

  Sand 
  and 
  gravel. 
  

   Unconformity 
  

  

  >> 
  

  

  u 
  

  

  .2 
  

  

  +3 
  

  

  u 
  

  

  CD 
  

   H 
  

  

  Pliocene. 
  

  

  Merced. 
  

  

  

  Purisima. 
  

  

  Fernando. 
  

  

  Miocene. 
  

  

  San 
  Pablo. 
  

   Unconformity 
  

  

  Monterey. 
  

  

  Unconformity 
  

  

  6 
  [Shale. 
  

  

  "3 
  J 
  Upper 
  sandstone. 
  

  

  SI 
  Shale. 
  

  

  ^ 
  [Lower 
  sandstone. 
  

  

  Vaqueros. 
  

  

  Vaqueros, 
  Sespe, 
  and 
  

   Tejon, 
  undifferenti- 
  

   ated 
  (including 
  some 
  

   Monterey 
  in 
  Santa 
  

   Ynez 
  Range). 
  

  

  Vaqueros. 
  

  

  Oligocene. 
  

  

  San 
  Lorenzo. 
  

  

  « 
  [Upper. 
  

   EVRed 
  beds. 
  

  

  Eocene. 
  

  

  Tejon. 
  

  

  

  Topatopa. 
  

  

  Martinez. 
  

   — 
  Unconformity? 
  — 
  

  

  Chico. 
  

   Unconformity 
  

  

  Horsetown. 
  

   Unconformity 
  

  

  Knoxville. 
  

  

  (?) 
  

  

  Knoxville. 
  

   Franciscan. 
  

  

  6 
  

   o 
  

   o 
  

   o 
  

  

  to 
  

  

  3 
  

   O 
  

   03 
  

  

  o 
  

   c 
  

  

  

  (?) 
  

  

  o 
  

   '55 
  

  

  CO 
  

  

  oa 
  

  

  (-, 
  

   i-s 
  

  

  - 
  

  

  Franciscan. 
  

  

  Unconformity 
  

  

  Granite, 
  schist, 
  etc. 
  

  

  Unconformity 
  ■ 
  

  

  Granite, 
  gneiss, 
  etc. 
  

  

  FRANCISCAN 
  FORMATION 
  (JURASSIC?). 
  

  

  The 
  oldest 
  rocks 
  within 
  the 
  Santa 
  Maria 
  district 
  belong 
  to 
  the 
  Fran- 
  

   ciscan 
  formation, 
  which 
  is 
  probably 
  of 
  Jurassic 
  age. 
  H. 
  W. 
  Fair- 
  

   banks 
  described 
  the 
  same 
  formation 
  under 
  the 
  name 
  San 
  Luis 
  in 
  the 
  

   San 
  Luis 
  folio. 
  The 
  Franciscan 
  is 
  a 
  very 
  important 
  basement 
  for- 
  

   mation 
  in 
  the 
  Coast 
  Ranges 
  farther 
  north. 
  The 
  small 
  areas 
  of 
  these 
  

   rocks 
  occurring 
  here 
  consist 
  of 
  remnants 
  of 
  beds 
  of 
  sandstone, 
  shale, 
  

   glaucophane 
  schist, 
  and 
  jasper 
  associated 
  with 
  serpentine 
  that 
  has 
  

   probably 
  been 
  intrusive 
  in 
  them. 
  The 
  sandstone 
  is 
  usually 
  of 
  a 
  dark- 
  

   green 
  color, 
  fairly 
  fine 
  grained, 
  and 
  considerably 
  indurated. 
  The 
  

   jasper 
  is 
  banded 
  by 
  thin 
  contorted 
  beds. 
  These 
  sediments 
  are 
  so 
  

  

  