﻿STRUCTURE 
  AND 
  CONDITIONS 
  AFFECTING 
  PRESENCE 
  OF 
  OIL. 
  85 
  

  

  FAULTS 
  AND 
  ASPHALT 
  DEPOSITS. 
  

  

  A 
  thrust 
  fault 
  is 
  well 
  exposed 
  in 
  two 
  forks 
  of 
  Cebada 
  Canyon, 
  where 
  

   the 
  Monterey 
  has 
  been 
  thrust 
  to 
  the 
  southwest 
  up 
  over 
  the 
  Fernando. 
  

   The 
  dip 
  of 
  the 
  fault 
  plane 
  is 
  toward 
  the 
  northeast 
  at 
  an 
  angle 
  of 
  about 
  

   30°. 
  The 
  movement 
  has 
  amounted 
  to 
  a 
  few 
  hundred 
  feet. 
  The 
  

   fault 
  zone 
  seems 
  to 
  continue 
  for 
  a 
  considerable 
  distance 
  toward 
  the 
  

   northwest 
  and 
  to 
  be 
  marked 
  near 
  the 
  Wise 
  & 
  Denigan 
  oil 
  well 
  No. 
  8 
  

   by 
  large 
  asphalt 
  deposits 
  occupying 
  fractures 
  in 
  the 
  Fernando 
  that 
  

   dip 
  at 
  an 
  angle 
  corresponding 
  to 
  that 
  of 
  the 
  fault 
  plane. 
  The 
  asphalt 
  

   back 
  of 
  the 
  Wise 
  & 
  Denigan 
  well 
  No. 
  1 
  is 
  probably 
  due 
  to 
  oil 
  that 
  

   has 
  seeped 
  through 
  the 
  same 
  fractured 
  zone 
  and 
  collected 
  in 
  the 
  

   sandy 
  capping. 
  

  

  The 
  structure 
  of 
  these 
  hills 
  is 
  further 
  complicated 
  by 
  a 
  prominent 
  

   overturned 
  anticline 
  in 
  the 
  Monterey 
  along 
  the 
  contact 
  with 
  the 
  

   Fernando 
  southwest 
  of 
  Los 
  Alamos 
  and 
  by 
  what 
  appears 
  to 
  be 
  a 
  fault 
  

   exposed 
  near 
  the 
  mouth 
  of 
  Canada 
  Laguna 
  Seca. 
  In 
  this 
  fault 
  the 
  

   Fernando 
  limestone 
  and 
  sand 
  are 
  thrown 
  down 
  several 
  hundred 
  

   feet 
  on 
  the 
  north, 
  at 
  the 
  edge 
  of 
  the 
  Los 
  Alamos 
  Valley. 
  

  

  In 
  addition 
  to 
  the 
  deposits 
  above 
  noted, 
  asphalt 
  occurs 
  in 
  great 
  

   abundance 
  south 
  and 
  east 
  of 
  Redrock 
  Mountain, 
  surrounded 
  by 
  

   a 
  large 
  area 
  of 
  very 
  bituminous 
  shale 
  and 
  burnt 
  shale. 
  Undoubtedly 
  

   an 
  immense 
  amount 
  of 
  petroleum 
  has 
  escaped 
  here, 
  but 
  it 
  is 
  not 
  

   probable 
  that 
  the 
  supply 
  is 
  exhausted. 
  On 
  the 
  contrary, 
  the 
  pres- 
  

   ence 
  of 
  this 
  petroliferous 
  material 
  on 
  the 
  surface, 
  coupled 
  with 
  the 
  

   favorable 
  structural 
  conditions, 
  points 
  strongly 
  to 
  the 
  existence 
  of 
  

   rich 
  oil 
  deposits 
  beneath. 
  

  

  A 
  large 
  mass 
  of 
  asphalt 
  is 
  present 
  in 
  the 
  much-fractured 
  Monterey 
  

   shale 
  west 
  of 
  La 
  Zaca 
  Creek, 
  and 
  very 
  bituminous 
  shale 
  approach- 
  

   ing 
  asphalt 
  in 
  character 
  occurs 
  on 
  the 
  creek 
  south 
  of 
  Zaca 
  station. 
  

   The 
  shale 
  is 
  bituminous 
  throughout 
  the 
  zone 
  of 
  disturbance 
  traversed 
  

   by 
  this 
  creek 
  south 
  of 
  Zaca. 
  On 
  account 
  of 
  the 
  low 
  position 
  of 
  the 
  

   strata 
  in 
  the 
  formation 
  and 
  the 
  severe 
  fracturing 
  and 
  folding 
  that 
  

   have 
  taken 
  place, 
  it 
  seems 
  probable 
  that 
  the 
  conditions 
  have 
  been 
  

   favorable 
  in 
  this 
  eastern 
  portion 
  of 
  the 
  Purisima 
  Hills 
  for 
  the 
  escape 
  

   of 
  much 
  of 
  the 
  petroleum. 
  

  

  Small 
  beds 
  of 
  bituminous 
  sands 
  interbedded 
  with 
  soft 
  shale 
  occur 
  

   in 
  the 
  upper 
  portion 
  of 
  the 
  Monterey 
  just 
  east 
  of 
  Canada 
  de 
  la 
  Puenta, 
  

   about 
  three-fourths 
  of 
  a 
  mile 
  south 
  of 
  the 
  Los 
  Alamos 
  Valley; 
  also 
  

   on 
  the 
  north 
  side 
  of 
  the 
  Purisima 
  Hills 
  ridge, 
  about 
  2 
  miles 
  south 
  

   of 
  Harris. 
  A 
  small 
  patch 
  of 
  shale 
  that 
  is 
  saturated 
  with 
  bituminous 
  

   material 
  is 
  exposed 
  in 
  the 
  canyon 
  followed 
  by 
  the 
  road 
  1 
  mile 
  south 
  

   of 
  the 
  Los 
  Alamos 
  Oil 
  and 
  Development 
  Company 
  well 
  No. 
  1, 
  and 
  

   the 
  shale 
  is 
  bituminous 
  in 
  the 
  neighborhood 
  of 
  the 
  Todos 
  Santos 
  well. 
  

  

  