stone.]  OIL    AND    GAS    FIELDS    OF    GREENE    COUNTY,    PA.  403 
sketch  map  (fig.  11).  The  floor  of  the  Pittsburg'  coal  is  selected  as  a 
reference  surface,  and  these  contour  lines,  drawn  with  a  vertical  inter- 
val of  50  feet,  represent  the  shape  of  the  folds.  The  Pittsburg  coal 
is  seen  at  the  surface  only  at  the  mouth  of  Tenmile  Creek  and  on  the 
river  above  Cats  Creek.  Its  position  has  been  calculated  from  higher 
beds  in  sight  at  the  surface  and  also  from  the  records  of  a  large  num- 
ber of  deep  wells  which  have  been  drilled  in  this  territory.  Enough 
such  data  have  been  obtained  to  make  the  determination  of  the  posi- 
tion of  the  coal  accurate  within  a  contpur  interval,  although  the  bed 
is  several  hundred  feet  below  the  surface  throughout  much  of  the 
county. 
FayettecCnticline. — The  Pittsburg  coal  in  the  southeast  part  of  Greene 
County  dips  sharply  to  the  west,  as  shown  by  the  contour  lines  along 
Dunkard  Creek.  This  is  the  western  flank  of  the  Fayette  anticline, 
a  structural  feature  which  is  strongly  developed  across  Fayette  and 
Westmoreland  counties,  and  terminates  at  Conemaugh  River  near 
Blairsville.  The  axis  of  this  anticline  crosses  Redstone  Creek  above 
Waltersburg  and  approaches  Monongahela  River  at  the  State  line. 
The  contour  lines  on  the  west  flank  of  this  fold  near  Greensboro  show 
the  relation  of  this  feature  to  the  axes  in  this  county.  A  full  descrip- 
tion of  this  anticline  will  be  found  in  the  Masontown-Uniontown  and 
Brownsville-Connellsville  folios  of  the  Geologic  Atlas  of  the  United 
States. 
Lambert  syncline. — A  basin  next  on  the  west  of  the  Fayette  anticline 
has  an  irregular  outline  and  its  axis  pursues  an  indirect  course,  cross- 
ing the  Monongahela  near  the  mouth  of  Middle  Run  and  entering 
this  county  with  a  westerly  trend.  It  turns  south  through  Paisley 
and  terminates  near  Willow  Tree.  The  axis  rises  to  the  south,  so  that 
the  coal  which  is  550  feet  above  sea  level  at  the  river  is  150  feet  higher 
at  the  southern  end  of  the  basin. 
Brownsville  anticline. — The  coal  rises  westward  from  the  Lambert 
syncline  in  an  irregular  arch  which  is  called  the  Brownsville  anticline. 
The  axis  of  this  fold  crosses  the  Monongahela  at  East  Riverside  and 
pursues  a  southerly  course  to  Turkey  Knob.  In  Greene  County  this 
anticline  is  but  a  slight  undulation  and  poorly  defined,  but  it  has  the 
effect  of  throwing  the  contour  lines  on  the  flank  of  the  Fayette  anticline 
in  the  vicinity  of  Davistown  into  a  north-south  direction. 
The  Brownsville  anticline  and  the  Lambert  syncline  extend  north- 
ward into  the  Brownsville  quadrangle,  where  they  terminate  between 
Fayette  City  on  Monongahela  River  and  Perry opolis  on  Youghiogheny 
River.  The  publications  mentioned  in  the  description  of  the  Fayette 
anticline  also  describe  these  folds. 
Whiteley  syncline. — Between  the  Brownsville  and  the  Bellevernon 
anticlines  there  is  a  broad  basin  which,  so  far  as  can  be  determined, 
