348         CONTRIBUTIONS   TO  ECONOMIC   GEOLOGY,   1907,   PART  II. 
This  bed  is  near  the  top  of  the  basal  Laramie  sandstone,  which  at 
this  place  is  largely  covered. 
Locality  No.  10:  The  next  indication  of  coal  is  4^  miles  S.  80°  W. 
from  locality  No.  9.  Here  the  following  section  was  taken  of  a 
small  outlier  at  the  base  of  the  Laramie: 
Section  at  base  of  Laramie,  locality  No.  10. 
Ft.    in. 
Sandstone,  brown,  massive 15 
Coal 6 
Shale,  gray,  sandy 90 
105       6 
At  this  horizon  farther  west  a  workable  bed  makes  its  appearance. 
Locality  No.  11:  At  locality  No.  11,  3i  miles  N.  53°  W.  of  locality 
No.  10,  the  following  section  was  obtained  on  Arroyo  Torrejon  at 
practically  the  same  horizon.     The  rocks  here  dip  N.  5°  W. 
Section  of  Laramie  coal  beds  at  locality  No.  11. 
Ft.    in. 
Sandstone,  brown,  massive 20 
Sandstone,  carbonaceous 8 
Coal 3 
Sandstone 1 
Coal 2 
Sandstone,  gray 35 
Sandstone,  carbonaceous 3 
Shale,  drab 4 
Coal 8 
Shale 5 
Sandstone,  soft,  grayish 40 
109       9 
It  will  be  noted  that  the  coal  beds  of  this  section  are  too  thin  to 
work,  but  the  section  is  given  in  order  to  indicate  the  gradual  increase 
westward  in  the  thickness  and  number  of  the  coal  beds. 
Localit}'  No.  12:  The  next  locality  of  coal  exposure  is  ?>\  miles 
N.  80°  W.  of  locality  No.  11,  and  at  this  point  the  first  section  of  clear 
coal  of  workable  thickness  was  obtained.  This  is  the  lowest  workable 
bed  of  the  area,  and  is  designated  coal  bed  A.  The  rocks  here  dip 
3°N. 
Section  of  coal  bed  A  at  locality  No.  12. 
Ft.    in. 
Covered ;  mostly  shale 30 
Shale,  black,  carbonaceous 4 
Shale,  brown. . . .' 5 
Shale,  drab 10 
Sandstone,  grayish 4 
CoalA 2      6 
Shale,  carbonaceous 10 
Sandstone,  grayish 20 
85      6 
