HARMONY,   COLOB,   AND   KANAB   COAL  FIELDS,   UTAH.  389 
the  field,  and  that  the  coal  occurs  in  beds  of  variable  extent  which 
are  lenslike  in  their  development.  Coal  has  been  found  near  the 
base  of  the  Cretaceous  rocks  wherever  sections  have  been  made,  and 
it  is  probable  that  the  entire  area  marked  on  the  map  by  stippling 
is  underlain  by  one  or  more  beds  of  coal.  In  prospecting  it  will  be 
convenient  to  bear  in  mind  that  the  coal  occurs  in  the  lower  part  of 
the  buff  and  drab  sandstone  and  shale  series,  usually  within  200  feet 
of  the  underlying  red  and  varicolored  shales  and  gypsum. 
The  rocks  on  the  Colob  Plateau  lie  almost  flat,  dipping  northeast- 
ward at  an  angle  of  only  1°  or  2°.  Along  the  margins  of  the  field 
the  rocks  are  traversed  by  normal  faults  of  large  displacement.  The 
Sevier  fault,  at  the  east  end,  is  of  such  magnitude  that  it  causes  a 
lateral  displacement  of  the  coal  of  about  9  miles,  and  forms  the 
boundary  between  the  Colob  and  Kanab  fields. 
The  following  measurements  of  the  coal  in  the  Colob  field  begin  in 
the  vicinity  of  Cedar  City  and  proceed  southeastward,  following  the 
crop  around  the  field.  (See  PI.  XXV.)  Several  layers  of  thin- 
bedded,  marly  shale  and  limestone  are  associated  with  the  coal, 
both  above  and  below.  They  contain  numerous  small  gasteropods, 
popularly  known  as  screw  shells,  which  serve  as  a  guide  in  pros- 
pecting. 
No  successful  coal  mines  have  been  located  on  the  north  side  of 
Coal  Creek,  and  apparently  beds  of  workable  thickness  do  not  extend 
north  of  this  stream.  Two  prospects  near  the  mouth  of  Maple 
Creek,  in  sec.  22,  T.  36  S.,  R.  10  W.,  show  that  the  coal  has  many 
partings,  and  it  is  probably  too  "dirty"  to  be  worked  with  profit. 
A  section  at  the  prospect  on  the  west  side  of  the  creek  is  as  follows: 
Section  at  prospect  in  the  SW.  I  sec.  22,  T.  36  S.,  R.  10  W. 
Limestone,  fossiliferous.  Ft.    in. 
Coal 8 
Shale 3 
Coal 1      2 
Bone 1 
Coal 10 
Shale 2 
Coal 11 
Shale 1 
Coal 7 
Shale 6 
Coal 2 
Total  coal 6      2 
At  the  head  of  and  south  of  Coal  Creek,  however,  coal  occurs  in 
workable  thickness,  and  a  number  of  prospect  pits  and  small  mines 
have  been  opened  to  supply  the  demand  for  domestic  coal  in  Cedar 
City. 
