4H2  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1904.         [bull.  260. 
ing  oil  to  local  manufacturing  concerns.  The  pumping  is  done  by 
hand  and  not  more  than  one-half  barrel  a  day  is  obtained  from 
each  well.  Similar  oil,  though  too  heavy  to  be  used  as  a  lubricant,  is 
found  at  shallow  depths  in  one  or  two  wells  on  the  banks  of  the 
Atchafalaya  River,  near  Bayou  Bouillon,  about  30  miles  northeast  of 
New  Iberia.  A  half  dozen  or  more  wells  have  been  sunk  at  this 
place.  The  derivation  of  small  quantities  of  lubricating  oil  from 
small  depths  at  Sulphur  Mine,  Louisiana,  is  also  well  known.  Sev- 
eral of  the  fields  here  enumerated,  notably  Kiser  Hill  and  Vinton,  are 
on  elevated  ground  similar  to  the  Spindletop  mound. 
Prospecting  on  mounds. — A  considerable  number  of  the  remain- 
ing spots  where  prospecting  has  been  active  agree  in  the  fact  of  their 
location  on  mounds.  Among  these  Damon  Mound  has  attained  some 
distinction  on  account  of  the  drilling  carried  on  there  for  several 
years.  Certain  surface  phenomena,  frequently  associated  with  the 
Coastal  Plain  oils,  are  noted  here,  but  no  oil  supply  has  been  encoun- 
tered. Bryan  Heights,  near  Velasco,  is  a  similar  mound  and  has  like- 
wise failed  to  produce  oil,  though  several  wells  have  produced  large 
quantities  of  gas.  Hoskins  Mound,  near  the  coast,  about  30  miles 
west  of  Galveston,  has  been  pierced  by  several  wells,  one  of  which 
struck  a  considerable  pocket  of  gas  and  blew  out  violently  for  a  few 
hours,  but  no  oil  has  been  obtained  except  that  which  came  out  with 
this  gas.  Barbers  Hill,  18  miles  south  of  Dayton,  has  also  been  the 
scene  of  considerable  drilling,  but  no  oil  has  thus  far  been  obtained. 
About  0  wells  have  been  drilled  on  High  Island,  about  30  miles  north- 
east of  Galveston.  There  are  at  this  place  some  springs  emitting 
gases  of  the  kinds  frequently  associated  with  the  Coastal  Plain  oils, 
but  the  search  for  oil  has  been  without  success.  Hackberry  Island, 
Louisiana,  is  very  similar  to  those  described  above.  Test  wells  have 
been  put  down  on  most  of  the  salt  islands  of  Louisiana.  Such  a  well 
on  Belle  Isle,  after  passing  through  five  thin  beds  of  salt,  obtained  a 
very  small  quantity  of  light-yellow  oil,  which  may  be  burned  in  a 
lamp  without  refining.  This  field  shares  with  Anse  la  Butte  the  dis- 
tinction of  having  yielded  oil  from  beneath  the  salt,  although  here, 
and  probably  also  at  Anse  la  Butte,  the  salt  passed  through  was  not 
the  main  body,  but  only  minor  lateral  extensions.  In  general,  expe- 
rience has  not  been  favorable  to  the  finding  of  oil  beneath  the  salt. 
Prospective  fields  marked  chiefly  by  gas. — Of  the  remaining  pros- 
pective fields  it  may  be  said  that  an  abundant  emission  of  gas,  with 
an  occasional  seepage  of  oil,  constitute  the  chief  surface  indications. 
Of  such  fields  the  vicinity  of  Dayton,  in  Liberty  County,  offers  good 
examples.  Several  wells  have  been  drilled  about  8  miles  west  of  this 
place,  and  others  to  the  east  and  north.  The  conditions  in  Sanj 
Augustine  and  Jasper  counties  are  similar  to  those  near  Dayton. 
Near  Ottine,  in  Gonzales  County,  gas  is  very  abundant.     On  the  flood 
