8  CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,  1907,  PART  II. 
was  the  intention  to  extend  the  survey  to  Glendive,  on  Yellowstone 
River,  but  Mr.  Smith  was  needed  to  complete  work  at  Miles  City, 
Mont.,  and  consequently  the  territory  examined  extended  only  from 
Medora  to  Wibaux,  Mont.,  a  little  west  of  the  North  Dakota  line. 
Montana.— In  Montana  six  geologic  parties  were  engaged  in  the 
study  of  coal  fields  during  the  summer  of  1907,  as  follows: 
1.  A  party  under  the  direction  of  Arthur  J.  Collier  made  a  survey 
of  the  coal  and  lignite  field  in  the  vicinity  of  Miles  City,  on  Yellow- 
stone River,  as  shown  by  area  No.  2  on  PL  I.  In  the  middle  of  the 
field  season  Mr.  Collier  was  called  away  to  other  work,  and  the  survey 
was  completed  by  the  union  of  Mr.  Collier's  and  Mr.  Smith's  parties 
under  the  latter' s  direction. 
2.  A  party  under  the  supervision  of  Lester  H.  Woolsey  made  a  sur- 
vey of  what  was  supposed  to  be  a  coal  field  along  Musselshell  River 
from  Shawmut  eastward.  No  coal  of  workable  thickness  was  found 
in  this  region,  and  late  in  the  season  work  was  begun  on  the  Bull 
Mountain  coal  field  near  Roundup,  as  shown  by  area  No.  3,  PL  I. 
This  is  a  promising  field,  and  is  likely  to  be  developed  in  the  near 
future  to  supply  coal  to  the  new  line  of  the  Chicago,  Milwaukee  and 
St.  Paul  Railway. 
3.  A  party  under  the  direction  of  Chester  W.  Washburne  examined 
the  Bridger  field  of  Carbon  County,  south  of  Yellowstone  River. 
This  is  an  important  field,  but  the  coal  of  workable  thickness  does 
not  extend  far  in  either  direction.  As  shown  by  area  No.  10  on  PL  I, 
Mr.  Washburne' s  field  is  largely  in  Wyoming,  and  consequently  his 
paper  is  given  under  that  State. 
4.  Elmer  G.  Woodruff's  party  made  a  detailed  survey  of  the  Red 
Lodge  coal  field,  which  includes  the  recent  extensive  developments 
on  Bear  Creek.  This  is  one  of  the  great  coal  fields  of  the  State,  not 
so  much  on  account  of  its  area  as  on  account  of  the  number  and  thick- 
ness of  the  coal  beds  and  the  quality  of  the  coal.  The  field  examined 
by  Mr.  Woodruff  is  represented  by  area  No.  5,  PL  I. 
5.  A  party  directed  by  Ralph  W.  Stone  mapped  and  studied  a 
supposed  coal  field  along  Musselshell  River  from  the  west  line  of  the 
field  examined  by  Mr.  Woolsey  to  the  head  of  the  stream,  and  from 
the  divide  westward  and  southward  along  the  Montana  Railroad. 
This  field  is  represented  by  area  No.  4  on  PL  I.  Mr.  Stone  succeeded 
in  showing  that  this  region  does  not  contain  workable  coal,  and 
consequently  can  not  be  counted  as  a  source  of  supply  for  the  future. 
6.  A  party  under  the  direction  of  William  R.  Calvert  examined  and 
mapped  the  Lewistown  coal  field  from  a  point  20  miles  east  of  Lewis- 
town  to  the  east  end  of  the  Little  Belt  Mountains,  where  connection 
was  made  with  the  Great  Falls  field  surveyed  by  Mr.  Fisher  in  1906. 
The  field  examined  by  Mr.  Calvert  is  represented  by  area  No.  7  on 
PL  I. 
