378         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PAKT   II. 
Locality  No.  18:  The  same  bed  was  observed  in  the  northeastern 
part  of  sec.  2,  T.  14  N.,  R.  8  W.,  where  the  section  is  as  follows: 
Section  of  Mesaverde  coal  bed  in  sec.  2,  T.  14  N.,  R.  8  W.  (No.  18). 
Ft.  in. 
Shale,  sandy 10 
Coal 2  6 
Shale 6 
Coal : 1  8 
Shale 4 
Covered.  
18  8 
Locality  No.  19:  In  the  mesa  in  sec.  9,  T.  13  N.,  R.  8  W.,  there  is 
only  one  workable  coal  bed.  This  is  3  feet  thick,  with  a  carbonaceous 
shale  above  and  below,  and  it  occurs  about  100  feet  below  the  top  of 
the  mesa,  on  the  west  face.  Other  thin  coal  beds  are  associated  with 
the  shales  and  sandstones  above  the  massive  sandstone  at  the  base  of 
the  mesa  which  represents  the  bottom  of  the  Mesaverde  formation. 
In  the  vicinity  of  San  Mateo  the  dips  change  from  north  to  east,  and 
as  a  result  the  outcrops  of  the  Mancos  and  Mesaverde  formations  turn 
to  the  south.  West  of  San  Mateo  the  outcrops  of  these  formations 
pass  beneath  a  lava  flow  which  covers  a  broad  expanse  of  country  to 
the  south  and  east.  It  is  probable  that  to  the  northeast,  toward 
Cabezon,  the  upper  Montana  coal  group  of  Schrader  is  identical  with 
the  upper  Mesaverde  of  Rio  Chaco  and  with  the  highest  coal-bearing 
strata  at  Gallup. 
