372         CONTKIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART   II. 
The  coal  beds  of  this  section  are  free  from  partings  and  resist 
weathering  fairly  well.  The  4-foot  bed  near  the  base  of  the  section 
does  not  present  a  favorable  appearance  at  the  surface  exposure.  It 
evidently  contains  a  large  percentage  of  hard,  argillaceous  material. 
Locality  No.  6:  The  following  section  represents  a  part  of  the  Man- 
cos  shale  in  the  east  part  of  sec.  18,  T.  16  N.,  R.  13  W.: 
Section  of  Mancos  coal  beds  in  sec.  18,  T.  16  'iV.,  R.  13  W.  (No.  6). 
Top  covered.  Ft.     in. 
Sandstone,  massive 5 
Shale,  carbonaceous 10 
Coal 6 
Shale,  carbonaceous . 1      6 
Coal 2      2 
Shale,  carbonaceous 2 
Sandstone  and  shale 6 
Coal 1 
Sandstone  and  thin  coals 90 
Covered.  
118      2 
This  section  shows  only  one  coal  bed  more  than  2  feet  in  thickness, 
but  it  is  probable  that  other  beds  occur  above  the  section  given  here, 
although  their  outcrop  is  so  covered  as  to  be  indistinguishable. 
Locality  No.  7:  Hosta  Butte  is  located  on  the  line  between  sees. 
26  and  27,  T.  16  N.,  R.  13  W.  The  main  portion  of  this  butte  is  com- 
posed of  an  outlier  of  the  upper  or  Mesaverde  coal  group,  and  the 
Mancos  coal  rocks  form  the  escarpment  about  1  mile  south  of  the 
butte.  The  base  of  the  main  butte  has  an  elevation  of  about  8,000 
feet;  the  top  of  the  escarpment,  at  a  triangulation  point  used  in  the 
survey  of  the  Wingate  quadrangle,  is  at  an  elevation  of  8,837  feet. 
Just  below  the  8,000-foot  level  is  a  coal  bed  2  feet  thick,  with  massive 
sandstone  above  and  shale  beneath.  The  bed  is  in  the  Mancos  shale 
and  apparently  contains  good  coal.  At  an  elevation  of  8,550  feet 
occurs  a  bed  3  feet  thick,  with  carbonaceous  shale  roof  and  floor.  At 
8,600  feet  is  a  bed  5  feet  thick,  of  clear  coal,  with  shale  above  and 
below.  The  two  latter  coal  beds  belong  in  the  Mesaverde  formation. 
They  are  clear  of  partings  or  any  apparent  injurious  constituents. 
Locality  No.  8 :  Devils  Pass  is  a  deep  canyon  cut  through  the  Mesa- 
verde rocks  from  sec.  20  to  sec.  3,  T.  16  N.,  R.  12  W.  The  following 
is  a  general  section  taken  in  the  southeast  corner  of  sec.  29  of  this 
township : 
Section  of  Mesaverde  coal-bearing  rocks  in  sec.  29,  T.  16  N.,  R.  12  W.  (No.  8). 
Sandstone,  massive.  Ft.     in. 
Shale .- 10 
Coal , 3      6 
Sandstones  and  shale  (shale  at  base) 25 
Coal. 3      6 
Shale  and  sandstone 10 
