﻿12 
  SANTA 
  MAKIA 
  OIL 
  DISTRICT, 
  CALIFORNIA. 
  

  

  The 
  present 
  writers 
  are 
  in 
  agreement 
  with 
  these 
  statements 
  except 
  

   as 
  regards 
  the 
  exclusively 
  Miocene 
  age 
  of 
  the 
  rocks, 
  a 
  large 
  part 
  of 
  

  

  which 
  are 
  here 
  considered 
  as 
  Eocene. 
  On 
  page 
  505 
  of 
  Fairbanks's 
  

   article 
  he 
  speaks 
  of 
  "shales 
  and 
  sandstones 
  of 
  undoubted 
  Cretaceous 
  

   aire*' 
  between 
  Gaviota 
  Pass 
  and 
  Santa 
  Ynez 
  River, 
  in 
  the 
  hills 
  which 
  

   in 
  the 
  present 
  paper 
  are 
  considered 
  as 
  part 
  of 
  the 
  Santa 
  Ynez 
  Range. 
  

   In 
  the 
  very 
  short 
  time 
  spent 
  in 
  this 
  locality 
  the 
  present 
  writers 
  

   found 
  no 
  evidence 
  of 
  the 
  presence 
  of 
  Cretaceous 
  rocks. 
  

  

  A 
  number 
  of 
  asphalt 
  deposits 
  in 
  northern 
  Santa 
  Barbara 
  County 
  

   are 
  described 
  on 
  pages 
  30 
  to 
  33 
  of 
  the 
  twelfth 
  annual 
  report 
  of 
  the 
  

   State 
  mineralogist, 
  cited 
  above. 
  The 
  localities 
  mentioned 
  are 
  on 
  

   the 
  Los 
  Alamos 
  grant, 
  44 
  miles 
  north 
  of 
  Harris 
  station; 
  along 
  the 
  

   northern 
  slope 
  of 
  the 
  hills 
  bordering 
  the 
  Santa 
  Maria 
  Valley, 
  10 
  miles 
  

   southeast 
  of 
  Santa 
  Maria; 
  about 
  2 
  miles 
  northeast 
  of 
  the 
  Purisima 
  

   Mission; 
  along 
  the 
  southern 
  slope 
  of 
  the 
  hills 
  between 
  the 
  Los 
  Ala- 
  

   mos 
  and 
  Santa 
  Ynez 
  valleys 
  (Purisima 
  Hills), 
  especially 
  on 
  the 
  San 
  

   Carlos 
  de 
  Jonata 
  grant; 
  and 
  in 
  poorer 
  and 
  less 
  known 
  deposits 
  at 
  

   Gaviota 
  Landing, 
  at 
  Point 
  Arguello, 
  near 
  the 
  mouth 
  of 
  Canada 
  

   Honda, 
  and 
  at 
  other 
  points 
  toward 
  Lompoc 
  Landing. 
  Seepages 
  

   out 
  of 
  the 
  bituminous 
  "slate" 
  (shale) 
  series 
  are 
  mentioned 
  as 
  occur- 
  

   ring 
  in 
  the 
  canyon 
  of 
  the 
  Sisquoc, 
  about 
  in 
  the 
  center 
  of 
  the 
  Sisquoc 
  

   grant, 
  along 
  Labrea 
  Creek, 
  and 
  near 
  the 
  west 
  end 
  of 
  the 
  Tinaquaic 
  

   grant. 
  

  

  By 
  far 
  the 
  best 
  observations 
  recorded 
  up 
  to 
  1896 
  regarding 
  the 
  

   geology 
  of 
  this 
  region 
  were 
  those 
  of 
  H. 
  W. 
  Fairbanks, 
  published 
  in 
  

   his 
  paper 
  on 
  the 
  "Geology 
  of 
  Point 
  Sal." 
  a 
  He 
  gives 
  a 
  detailed 
  de- 
  

   scription 
  of 
  the 
  igneous 
  and 
  sedimentary 
  formations 
  occurring 
  at 
  

   the 
  seaward 
  end 
  of 
  the 
  hills, 
  termed 
  in 
  the 
  present 
  report 
  the 
  Cas- 
  

   malia 
  Hills. 
  In 
  speaking 
  of 
  the 
  even 
  summit 
  line 
  of 
  the 
  Point 
  Sal 
  Ridge 
  

   he 
  says: 
  

  

  The 
  regularity 
  is 
  due, 
  in 
  part 
  at 
  least, 
  to 
  the 
  fact 
  that 
  the 
  strata 
  on 
  the 
  summit 
  are 
  

   nearly 
  flat 
  and 
  composed 
  of 
  the 
  resistant 
  Miocene 
  flints, 
  while 
  on 
  the 
  southern 
  slope 
  

   the 
  bituminous 
  shales 
  are 
  followed 
  in 
  descending 
  order 
  by 
  a 
  great 
  thickness 
  of 
  gypsif- 
  

   erous 
  clays, 
  in 
  which 
  broad 
  valleys 
  have 
  been 
  eroded. 
  Lower 
  down 
  toward 
  the 
  

   ocean 
  the 
  clays 
  are 
  replaced 
  by 
  strata 
  of 
  volcanic 
  ash, 
  sandstone, 
  and 
  conglomerate, 
  

   in 
  which, 
  because 
  of 
  their 
  greater 
  resistance, 
  canyons 
  have 
  been 
  eroded. 
  The 
  strata 
  

   of 
  volcanic 
  ash 
  form 
  very 
  striking 
  features 
  in 
  the 
  landscape 
  on 
  the 
  lower 
  slopes 
  of 
  the 
  

   ridge; 
  being 
  interbedded 
  with 
  soft 
  clays 
  they 
  weather 
  out 
  in 
  cliffs 
  and 
  projecting 
  

   ridges. 
  

  

  In 
  outlining 
  the 
  geology 
  of 
  the 
  region 
  of 
  Point 
  Sal 
  Ridge, 
  Fair- 
  

   banks 
  says: 
  

  

  The 
  region 
  about 
  the 
  point 
  itself 
  has 
  been 
  the 
  scene 
  of 
  many 
  violent 
  disturbances 
  

   and 
  repeated 
  eruptions 
  of 
  basic 
  magmas. 
  A 
  part 
  of 
  these 
  consolidated 
  as 
  surface 
  

   flows, 
  while 
  others 
  have 
  the 
  characters 
  of 
  deep-seated 
  rocks. 
  

  

  The 
  sedimentary 
  strata 
  comprise 
  only 
  the 
  Pleistocene, 
  Miocene, 
  and 
  Knoxville. 
  

   * 
  * 
  * 
  The 
  Miocene 
  is 
  the 
  most 
  extensive 
  formation 
  represented. 
  * 
  * 
  * 
  It 
  is 
  

  

  a 
  Bull. 
  Dept. 
  Geology 
  Univ. 
  California, 
  vol. 
  2, 
  No. 
  1, 
  1896, 
  pp. 
  1-92. 
  

  

  