In  this  case  the  oil  formation  comes  up  from  both  sides,  joining
at  the  top,  and  the  two  sides  are  more  or  less  alike.
A  monocline  is  where  you  find  the  oil  formation  coming  up  only
on  one  side,  frequently  revealing  the  oil  itself  at  the  surface.  It  is  like
this  (indicating  with  one  hand).
A  syncline  is  the  low  ground  between  two  monoclines,  or  between
a  monocline  and  one  side  of  an  anticline,  or  between  the  adjoining  sides
of  two  anticlines.  It  is  like  this  (indicating  with  hands).
Now  with  this  understanding,  you  may  know  what  the  oil  man
must  look  for  when  he  goes  out  prospecting.  If  he  finds  the  apex —
because  these  oil  mines  have  their  apices  and  their  boundaries  precisely
as  quartz  mines  do — if  he  finds  the  apex  of  an  oil  formation,  he  does  not
sink  right  there,  especially  if  it  is  the  apex  of  a  monocline,  but  he  goes
out  on  the  formation  and  sinks  his  well.  He  may  go  out  on  the  forma-
tion a  thousand  feet  from  the  apex,  he  mav  go  two  thousand  feet,  or
three  thousand  feet,  as  he  may  decide,  and  he  siitks  down  hoping  he
will  get  oil.  Sometimes  he  does,  and  sometimes  he  does  not.  Probably
the  times  when  he  does  not  succeed  are  much  greater  in  number  than
wh«n  he  does  succeed.
