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  STEUCTUEE 
  AND 
  CONDITIONS 
  AFFECTING 
  PEESENCE 
  OF 
  OIL. 
  75 
  

  

  the 
  rose-colored 
  or 
  slaglike 
  rock 
  observed 
  at 
  many 
  places 
  in 
  this 
  and 
  

   other 
  oil-bearing 
  regions 
  within 
  the 
  Monterey 
  formation. 
  It 
  is 
  fully 
  

   discussed 
  on 
  pages 
  48-52. 
  It 
  is 
  the 
  result 
  of 
  the 
  burning 
  of 
  the 
  hydro- 
  

   carbons 
  that 
  have 
  impregnated 
  the 
  shale, 
  and 
  its 
  presence 
  therefore 
  

   indicates 
  where 
  seepages 
  have 
  existed. 
  

  

  GENERAL 
  STRUCTURAL 
  CONSIDERATIONS. 
  

  

  The 
  area 
  comprised 
  within 
  the 
  limits 
  of 
  the 
  Lompoc 
  and 
  Guadalupe 
  

   quadrangles 
  has 
  been 
  subjected 
  to 
  two 
  systems 
  of 
  forces 
  acting 
  

   obliquely 
  to 
  each 
  other, 
  the 
  one 
  producing 
  structural 
  features 
  which 
  

   trend 
  northwest 
  and 
  southeast, 
  the 
  other 
  those 
  which 
  trend 
  east 
  and 
  

   west. 
  (See 
  PI. 
  VII.) 
  The 
  system 
  causing 
  the 
  northeast-southwest 
  

   structure 
  was 
  probably 
  the 
  older 
  and 
  dominating 
  one, 
  as 
  it 
  brought 
  

   forth 
  the 
  highest 
  ranges 
  and 
  most 
  extreme 
  folding 
  and 
  conformed 
  

   with 
  the 
  great 
  system 
  which 
  has 
  determined 
  not 
  only 
  the 
  Coast 
  

   Ranges 
  of 
  California 
  but 
  the 
  western 
  border 
  of 
  the 
  North 
  American 
  

   continent. 
  The 
  forces 
  producing 
  the 
  east-west 
  features, 
  although 
  

   exceedingly 
  effective 
  from 
  the 
  west 
  end 
  of 
  the 
  Santa 
  Ynez 
  Range 
  east- 
  

   ward 
  to 
  the 
  region 
  south 
  of 
  the 
  end 
  of 
  the 
  San 
  Joaquin 
  Valley, 
  were 
  

   not 
  so 
  far-reaching 
  as 
  those 
  of 
  the 
  other 
  system 
  and 
  probably 
  began 
  

   to 
  exert 
  themselves 
  at 
  a 
  later 
  date. 
  

  

  That 
  portion 
  of 
  the 
  area 
  under 
  discussion 
  which 
  lies 
  to 
  the 
  north- 
  

   east 
  of 
  the 
  Santa 
  Maria 
  Valley 
  is 
  dominated 
  almost 
  completely 
  by 
  

   structural 
  lines 
  trending 
  northwest 
  and 
  southeast; 
  in 
  the 
  extreme 
  

   southern 
  portion 
  lines 
  trending 
  east 
  and 
  west 
  prevail. 
  The 
  region 
  

   between 
  these 
  two 
  areas 
  is 
  occupied 
  by 
  folds 
  and 
  faults, 
  some 
  of 
  whose 
  

   component 
  parts 
  exhibit 
  allegiance 
  to 
  one 
  system 
  and 
  some 
  to 
  the 
  

   other, 
  but 
  whose 
  resultant 
  trend 
  is 
  intermediate 
  between 
  the 
  two. 
  

   In 
  a 
  general 
  way 
  the 
  lines 
  of 
  disturbance 
  as 
  well 
  as 
  the 
  topographic 
  

   relief 
  within 
  this 
  central 
  province 
  radiate 
  fanlike 
  from 
  the 
  point 
  of 
  

   divergence 
  of 
  the 
  Santa 
  Ynez 
  and 
  San 
  Rafael 
  ranges 
  east 
  of 
  the 
  town 
  

   of 
  Santa 
  Ynez. 
  

  

  The 
  forces 
  acting 
  throughout 
  the 
  region 
  have 
  more 
  often 
  found 
  

   equilibrium 
  in 
  the 
  production 
  of 
  folds 
  than 
  in 
  adjustment 
  by 
  faulting. 
  

   Several 
  important 
  faults 
  are 
  recognizable, 
  however, 
  and 
  doubtless 
  

   others 
  will 
  be 
  revealed 
  by 
  detailed 
  work, 
  especially 
  in 
  the 
  San 
  Rafael 
  

   Range. 
  There 
  is 
  evidence 
  to 
  show 
  that 
  forces 
  have 
  acted 
  intermit- 
  

   tently 
  along 
  the 
  same 
  general 
  lines 
  throughout 
  a 
  long 
  period 
  of 
  time. 
  

  

  DETAILED 
  DISCUSSION 
  OF 
  STRUCTURE. 
  

  

  In 
  the 
  field 
  study 
  of 
  the 
  structures 
  of 
  the 
  formations 
  and 
  in 
  the 
  

   present 
  discussion 
  special 
  attention 
  has 
  been 
  paid 
  to 
  the 
  structure 
  of 
  

   the 
  Monterey 
  shales, 
  because 
  that 
  formation 
  has 
  apparently 
  given 
  

   origin 
  to 
  the 
  petroleum 
  and 
  in 
  it 
  the 
  bulk 
  of 
  the 
  oil 
  is 
  stored. 
  

  

  