DCRANGO-GALLUP    COAL    FIELD,    COLORADO-NEW    MEXICO.        253 
I  In  tne  center  of  the  district,  near  Hosta  Butte,  the  vertical  interval  between  the  groups 
is  about  500  or  600  feet.  In  general,  the  dip  of  the  rocks  is  to  the  north  and  the  coal  beds 
lire  exposed  in  southward-facing  escarpments,  but  where  the  rocks  arc  sharply  upturned, 
In  the  hogback  east  of  Gallup,  they  do  not  seem  to  carry  coal  in  workable  amount. 
!  The  coals  of  this  district  have  been  little  prospected,  but  they  show  in  natural  outcrop  at 
Hnany  localities.  The  better-known  exposures  lie  along  the  Grant-Farmington  road,  the 
Fhoreau-Seven  Lakes  road,  the  Devils  Pass  trail,  near  Lake  Mariana,  and  at  Hosta  Butte, 
where  the  rocks  are  raised  into  a  low  dome. 
So  far  as  known,  the  lower  coal  group  contains  only  one  workable  bed,  which,  as  shown 
[n  the  following  section,  is  about  2^,  feet  in  thickness: 
Bed  ion  of  coal  bed  of  lower  coal  group  in  the  mesa  15  miles  north-northeast  ofThoreau,  N .  Mex. 
Shale.  Ft.  In. 
Coal 2      6 
Draw  slate 3 
Coal 10 
Shale,  brown,  carbonaceous 2 
Shale  and  sandstone 20 
Coal 1 
Shale,  brown,  carbonaceous. 
':    A  similar  section  is  exposed  15  miles  north  of  Bluewater,  at  the  J.  E.  Tiejen  prospect,  on 
■a  coal  bed  that  is  supposed  to  be  the  same  as  the  one  noted  above. 
Coal  is  more  abundant  in  the  middle  group  than  in  the  lower.  The  former  contains 
a  vast  amount  of  coal,  as  shown  by  the  area!  distribution  of  the  measures  on  the  map  (PL 
VII)  and  the  coal  beds  given  in  the  following  sections: 
Section  of  coal  beds  near  the  Farmington  road,  25  miles  west  of  San  Mateo,  N .  Mex. 
Shale.  Ft.  In. 
Coal 2    6 
Coal,  bony 2 
Coal 2    G 
Shale. 
Shale  and  sandstone  interbedded 25 
Coal 2    G 
Shale. 
Section  of  coal  beds  in  Devils  Pass-,  't  miles  east  of  Hosta  Butte,  N.  .1/ t  r. 
Sandstone,  heavy.  Ft.  In. 
Shale 10 
Coal 3    6 
Shale  and  sandstone 25 
Shale. 
Coal • 3    G 
Shale. 
Shale  and  sandstone 10 
Shale 8 
Coal 1 
Shale  and  sa ndstone 20 
Shale. 
Coal 1    6 
Draw  slate 1 
Coal , 1    6 
Shale. 
Shale  and  sandstone 100 
Shale,  brown,  carbonaceous 1 
Coal , . , 2 
Shale - 3 
Coal ,.,; 2 
Shale,  brown,  carbonaceous ,--.-., 1 
Shale „ , :. 2 
