﻿84 
  SANTA 
  MAIM 
  A 
  OIL 
  DTSTRTCT, 
  CALIFORNIA. 
  

  

  mentioned 
  on 
  Burton 
  Mesa, 
  exposes 
  bard 
  shale 
  that 
  is 
  low 
  down 
  in 
  

   the 
  Monterey, 
  and 
  it 
  Is 
  probable 
  thai 
  with 
  the 
  removal 
  of 
  all 
  of 
  the 
  

   higher 
  portion 
  opportunity 
  has 
  been 
  offered 
  for 
  the 
  escape 
  of 
  the 
  

   greater 
  part 
  of 
  the 
  oil 
  from 
  the 
  basal 
  beds. 
  

  

  A 
  low 
  anticlinal 
  fold 
  occurs 
  in 
  the 
  northeast 
  corner 
  of 
  Burton 
  Mesa 
  

   and 
  plunges 
  toward 
  the 
  southeast. 
  As 
  indicated 
  by 
  the 
  dotted 
  line 
  

   on 
  the 
  map, 
  it 
  is 
  possibly 
  a 
  continuation 
  of 
  the 
  anticline 
  south 
  of 
  

   Antonio 
  before 
  mentioned 
  and 
  another 
  on 
  the 
  east 
  edge 
  of 
  the 
  mesa 
  

   that 
  is 
  discussed 
  in 
  connection 
  with 
  the 
  Purisima 
  Hills. 
  The 
  evi- 
  

   dence 
  of 
  folds 
  in 
  this 
  northeastern 
  portion 
  of 
  the 
  mesa 
  is 
  scanty, 
  but 
  

   it 
  is 
  probable 
  that 
  wdiere 
  they 
  occur 
  accumulations 
  of 
  oil 
  are 
  present. 
  

  

  The 
  brittle 
  calcareous 
  and 
  flinty 
  shale 
  of 
  the 
  lower 
  portion 
  of 
  the 
  

   Monterey 
  that 
  is 
  exposed 
  along 
  the 
  coast 
  edge 
  of 
  Burton 
  Mesa 
  is 
  very 
  

   bituminous. 
  The 
  petroleum 
  slowly 
  oozes 
  out 
  in 
  some 
  places 
  and 
  

   collects 
  in 
  tarry 
  patches 
  over 
  the 
  shale. 
  Up 
  Oak 
  Canyon 
  the 
  shale 
  is 
  

   bituminous, 
  pockets 
  of 
  tar 
  being 
  found 
  in 
  places 
  in 
  the 
  flint 
  on 
  the 
  

   surface. 
  On 
  the 
  northern 
  border 
  of 
  the 
  mesa, 
  near 
  the 
  point 
  where 
  

   the 
  road 
  to 
  Lompoc 
  comes 
  up 
  the 
  grade, 
  a 
  3-inch 
  bed 
  of 
  bituminous 
  

   sand 
  was 
  found 
  traversing 
  the 
  shale 
  fairly 
  high 
  in 
  the 
  formation. 
  

  

  PURISIMA 
  HILLS. 
  

   FOLDS. 
  

  

  The 
  Purisima 
  Hills 
  are 
  formed 
  by 
  one 
  broad 
  anticline 
  which 
  has 
  its 
  

   axis 
  on 
  the 
  south 
  side 
  of 
  the 
  summit 
  of 
  the 
  dominating 
  ridge. 
  Through 
  

   the 
  major 
  portion 
  of 
  this 
  anticline's 
  course, 
  from 
  the 
  region 
  north 
  of 
  

   the 
  Hill 
  wells 
  to 
  a 
  point 
  beyond 
  Redrock 
  Mountain, 
  the 
  beds 
  lie 
  

   almost 
  horizontal 
  on 
  its 
  summit, 
  becoming 
  gradually 
  steeper 
  up 
  to 
  

   an 
  angle 
  of 
  15° 
  or 
  20°, 
  or 
  locally 
  even 
  40°, 
  within 
  a 
  mile 
  or 
  two 
  from 
  

   the 
  axis. 
  The 
  general 
  trend 
  of 
  this 
  fold 
  is 
  more 
  to 
  the 
  north 
  of 
  west 
  

   than 
  that 
  of 
  the 
  Los 
  Alamos 
  or 
  Santa 
  Ynez 
  valleys, 
  but 
  portions 
  of 
  

   it 
  have 
  a 
  more 
  westerly 
  course, 
  as 
  at 
  the 
  west 
  end, 
  where 
  it 
  also 
  

   becomes 
  a 
  steeper 
  fold. 
  At 
  the 
  east 
  end 
  it 
  has 
  the 
  dominant 
  

   northwest-southeast 
  trend 
  characteristic 
  of 
  this 
  part 
  of 
  the 
  hills 
  and 
  

   likewise 
  becomes 
  steeper. 
  It 
  is 
  a 
  fold 
  plunging 
  from 
  either 
  end 
  

   toward 
  the 
  region 
  at 
  the 
  head 
  of 
  Cebada 
  Canyon, 
  where 
  the 
  axis 
  

   of 
  the 
  depression 
  in 
  the 
  anticline 
  occurs. 
  This 
  depression 
  appears 
  

   like 
  a 
  broad 
  syncline 
  crossing 
  the 
  anticline 
  at 
  right 
  angles, 
  with 
  the 
  

   deepest 
  portion 
  of 
  its 
  trough 
  at 
  this 
  point. 
  

  

  The 
  Purisima 
  Hills 
  anticline 
  can 
  n<Jt 
  be 
  traced 
  farther 
  westward 
  

   than 
  is 
  shown 
  on 
  the 
  map, 
  but 
  at 
  the 
  west 
  end 
  there 
  seems 
  to 
  occur 
  a 
  

   structural 
  offset 
  to 
  the 
  northwest, 
  a 
  poorly 
  exposed 
  anticline 
  about 
  

   a 
  mile 
  from 
  the 
  end 
  of 
  the 
  main 
  fold 
  being 
  traceable 
  for 
  a 
  short 
  dis- 
  

   tance 
  and 
  seeming 
  to 
  mark 
  the 
  continuation 
  of 
  the 
  general 
  structure 
  

   of 
  these 
  hills. 
  There 
  is 
  a 
  likelihood 
  that 
  oil 
  may 
  be 
  found 
  along 
  this 
  

   fold 
  as 
  well 
  as 
  along 
  the 
  main 
  anticline. 
  

  

  