﻿STRUCTURE 
  AND 
  CONDITIONS 
  AFFECTING 
  PRESENCE 
  OF 
  OIL. 
  81 
  

  

  The 
  conditions 
  along 
  this 
  anticline, 
  especially 
  through 
  the 
  eastern 
  

   half 
  of 
  its 
  length, 
  favor 
  the 
  occurrence 
  of 
  some 
  oil 
  at 
  least, 
  as 
  the 
  

   axis 
  exposes 
  beds 
  fairly 
  high 
  in 
  the 
  formation 
  and 
  the 
  folding 
  is 
  

   gentle. 
  No 
  surface 
  indications 
  of 
  petroleum 
  were 
  found, 
  except 
  a 
  

   patch 
  of 
  burnt 
  shale 
  south 
  of 
  the 
  road 
  about 
  1 
  mile 
  southwest 
  of 
  the 
  

   highest 
  hill 
  (elevation 
  1,300 
  feet) 
  and 
  local 
  outcrops 
  of 
  bituminous 
  

   black 
  flint 
  and 
  brown 
  shale 
  on 
  the 
  west 
  side 
  of 
  the 
  800-foot 
  hill 
  about 
  

   half 
  a 
  mile 
  north 
  of 
  the 
  river 
  and 
  1J 
  miles 
  west 
  of 
  the 
  east 
  edge 
  of 
  the 
  

   Santa 
  Rosa 
  grant. 
  

  

  MAIN 
  PORTION 
  OF 
  THE 
  SANTA 
  YNEZ 
  RANGE. 
  

  

  The 
  Santa 
  Ynez 
  Range 
  is 
  composed 
  chiefly 
  of 
  Tejon 
  and 
  Yaqueros 
  

   rocks 
  and 
  its 
  structure 
  is 
  therefore 
  much 
  less 
  important 
  in 
  connec- 
  

   tion 
  with 
  the 
  oil 
  deposits 
  than 
  that 
  of 
  the 
  areas 
  underlain 
  by 
  the 
  

   Monterey 
  shale. 
  It 
  is 
  dominated 
  by 
  a 
  great 
  southward-dipping 
  

   monocline 
  that 
  forms 
  a 
  high 
  ridge 
  along 
  the 
  coast, 
  north 
  of 
  which 
  the 
  

   strata 
  are 
  gently 
  folded 
  along 
  curving 
  lines 
  that 
  reflect 
  two 
  different 
  

   structural 
  trends. 
  The 
  folds 
  that 
  expose 
  the 
  Tej 
  on-Vaqueros 
  and 
  

   the 
  underlying 
  Franciscan 
  beneath 
  the 
  Monterey 
  toward 
  the 
  west 
  

   end 
  of 
  the 
  range 
  are 
  in 
  places 
  abrupt 
  and 
  complex. 
  The 
  anticline 
  

   of 
  the 
  Santa 
  Rita 
  Hills 
  has 
  the 
  appearance 
  of 
  crossing 
  the 
  Santa 
  

   Ynez 
  Valley 
  and 
  continuing 
  in 
  a 
  large 
  fold 
  to 
  the 
  southeast. 
  

  

  REGTON 
  BETWEEN 
  THE 
  SAN 
  RAFAEL 
  AND 
  SANTA 
  YNEZ 
  MOUNTAINS. 
  

   CASMALIA 
  HILLS 
  AND 
  SAN 
  ANTONIO 
  TERRACE. 
  

  

  Two 
  dominant 
  structural 
  lines 
  control 
  the 
  region 
  of 
  the 
  Casmalia 
  

   Hills 
  and 
  the 
  San 
  Antonio 
  terrace. 
  One 
  is 
  a 
  typical 
  fault 
  starting 
  

   on 
  the 
  coast 
  south 
  of 
  Lions 
  Head 
  and 
  the 
  long 
  area 
  of 
  igneous 
  rocks 
  

   and 
  running 
  southeastward. 
  About 
  2 
  miles 
  west 
  of 
  Casmalia 
  the 
  

   line 
  is 
  continued 
  by 
  an 
  anticline, 
  which 
  is 
  probably 
  affected 
  by 
  faults 
  

   at 
  least 
  as 
  far 
  as 
  Schumann 
  Canyon. 
  This 
  anticline 
  plunges 
  more 
  

   and 
  more 
  toward 
  the 
  southeast 
  and 
  loses 
  its 
  character 
  as 
  a 
  fold, 
  giv- 
  

   ing 
  place 
  to 
  the 
  eastward-dipping 
  monocline 
  of 
  the 
  San 
  Antonio 
  

   terrace. 
  

  

  The 
  other 
  structure 
  line 
  is 
  one 
  of 
  varying 
  character, 
  represented 
  

   on 
  the 
  map 
  as 
  the 
  Schumann 
  anticline. 
  Northeast 
  of 
  the 
  area 
  of 
  

   igneous 
  rocks 
  that 
  meets 
  the 
  sea 
  at 
  Lions 
  Head 
  Miocene 
  strata 
  

   form 
  a 
  great 
  monocline, 
  dipping 
  rather 
  steeply 
  to 
  the 
  northeast. 
  In 
  

   the 
  high 
  region 
  of 
  Mount 
  Lospe 
  and 
  northeast 
  of 
  the 
  long 
  strike 
  

   ridges 
  (shown 
  in 
  PI. 
  IX, 
  A, 
  B) 
  that 
  extend 
  southeastward 
  from 
  that 
  

   peak, 
  this 
  monocline 
  flattens 
  out 
  into 
  a 
  structural 
  platform 
  of 
  very 
  

   low 
  dip, 
  which 
  on 
  approaching 
  the 
  edge 
  of 
  the 
  steep 
  descent 
  to 
  the 
  

   Santa 
  Maria 
  Valley 
  bends 
  over 
  and 
  drops 
  off 
  abruptly. 
  The 
  axis 
  

   along 
  which 
  this 
  steepening 
  of 
  the 
  dip 
  occurs 
  is 
  in 
  a 
  way 
  equivalent 
  

  

  