stone]  OIL    AND    GAS    FIELDS    OF    GREENE    COUNTY,   PA.  409 
be  seen  on  Dunkard  Creek  about  a  mile  west  of  Mount  Morris,  and 
there  appears  to  be  a  flattening-  and  possibly  a  doming-  of  the  structure 
3  miles  west  of  Davistown.  It  is  interesting  to  note  that  gas  is  found 
in  wells  drilled  east  of  the  oil  belt  and  higher  on  the  limb  of  the  fold. 
Wells  in  Whiteley  syncline. — A  group  of  wells  on  the  State  line  4 
miles  west  of  Mount  Morris,  on  the  Shriver  and  Brown  farms,  are  pro- 
ducing a  small  amount  of  oil.  In  this  small  held  the  oil  is  found  in 
the  Big  Injun  sand,  which  also  carries  considerable  water  here.  The 
Pittsburg  coal  is  400  feet  above  sea  level  in  these  wells.  A  number  of 
holes  drilled  in  this  syncline  have  proved  to  be  dry  or  very  light  pro- 
ducers, and  have  been  abandoned. 
Wells  on  Bellevernon  anticline. — This  fold  in  the  rock  structure  is 
marked  hy  a  larg-e  number  of  wells  in  Greene  County.  The  several 
groups  of  wells  are  usually  known  as  the  Clarksville,  Zollarsville, 
Waynesburg,  Kneisley,  and  Roberts  Run  fields. 
The  Clarksville  held  is  composed  of  about  20  wells  in  Greene  and 
Washington  counties,  near  the  village  of  the  same  name  on  Tenmile 
Creek.  These  wells  are  close  to  the  anticlinal  axis  and  get  most  of 
their  gas  from  the  Gantz  sand;  a  smaller  amount  comes  from  the 
Fifty-foot  and  Bayard  sands. 
The  Zollarsville  field  extends  from  Washington  County  southward  to 
Castile  Run,  and  that  part  of  it  which  is  in  Greene  County  lies  about 
3  miles  west  and  northwest  of  Clarksville.  There  are  about  a  dozen 
wells  in  the  group  south  of  the  county  line,  all  of  which  produce  gas. 
The  records  show  that  the  Fifty-foot  and  Bayard  are  the  principal  pro- 
ducing sands  in  this  locality,  with  lesser  amounts  of  gas  in  the  Big 
Injun  and  Fifth  sands.  This  field  is  on  the  western  flank  of  the  Belle- 
vernon anticline,  about  midway  between  the  arch  and  the  basin  on  the 
west.  According  to  the  structure  lines  on  the  sketch  map,  this  field 
finds  the  producing  sands  from  200  to  300  feet  lower  than  in  the 
Clarksville  field.  The  territory  between  the  two  fields  is  supposed  to 
be  good  gas  country. 
The  Waynesburg  field  is  one  of  the  largest  groups  of  wells  in  this 
corner  of  the  State.  The  earliest  drilling  was  in  1889,  but  active 
operations  were  not  begun  until  after  the  discovery  of  the  Bayard 
sand  in  1895.  The  wells  in  the  immediate  vicinity  of  the  village  of 
Waynesburg  have  all  been  drilled  since  1900.  A  number  of  wells 
which  may  be  included  in  this  field  are  scattered  along  the  eastern 
limb  of  this  fold  from  Jefferson  to  the  head  of  Whiteley  Creek,  but 
the  majority  are  on  the  western  flank  and  within  about  3  miles  of 
Waynesburg.  The  producing  wells  are  located  not  only  on  the  crest 
of  the  fold  but  also  down  the  western  flank  to  the  400-foot  contour  on 
the  Pittsburg  coal,  where  there  is  a  flattening  of  the  dip.  Within  the 
limits  there  is  a  descent  in  structure  of  more  than  250  feet. 
