THE  GLENROCK  COAL  FIELD,  WYOMING. 
By  E.  Wesley  Shaw. 
INTRODUCTION. 
The  Glenrock  coal  field,  in  the  east-central  part  of  Wyoming, 
comprises  the  southern  end  of  a  great  area  of  coal-bearing  rocks,  the 
Fort  Union  region,  which  covers  the  northeastern  part  of  Wyoming, 
most  of  the  eastern  half  of  Montana,  and  the  western  half  of  North 
Dakota.     (See  fig.  4.)     The  principal  towns  in  this  field  are  Casper 
Fig.  4.— Index  map  showing  location  of  Glenrock  coal  field,  Wyoming. 
and  Douglas,  each  having  about  1,000  inhabitants  and  being  the 
center  of  an  extensive  stock-raising  community.  There  arc  also 
three  or  four  smaller  towns  along  the  line  of  the  Chicago  and  North- 
western Railway,  the  most  important  of  which  in  regard  to  coal 
mining  is  Glenrock.  The  field  described  in  this  report  is  nearly 
rectangular,  with  Douglas  near  the  southeast  corner  and  Casper  near 
the  southwest  corner.  It  is  about  56  miles  east  and  wesl  by  27  miles 
north  and  south,  and  comprises  an  area  of  about  1,512  square  miles. 
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