328  CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1005. 
At  a  number  of  points  in  the  Slim  Buttes  workable  seams  of  lignite  are  exposed.  At  the 
north  end  two  5-foot  beds  are  present,  the  lower  lying  1 10  feet  above  South  Fork  of  (band 
River  and  separated  from  the  upper  seam  by  260  feei  of  sand  and  clay.  On  the  west  side, 
5  or  6  miles  from  the  north  end  of  the  butte,  in  sec.  12,  T.  18  N.,  R.  7  E.,  a  seam  10|  feet 
thick  outcrops,  and  in  see.  23  of  the  same  township  and  range  two  beds  occur,  one  4^  to  8 
feet  thick  and  the  other  5|  to  G  feet.c  A  lignite  bed  0  to  <S  feet  thick  is  reported  to  occur 
8  miles  east  of  Keva  post-office  and  another  15  miles  east. 
Several  good  lignite  seams  are  found  on  Big  Nasty  Creek,  which  has  its  source  in  the  Cave 
Hills  and  flows  southeastward  into  South  Fork  of  Grand  River.     Two  and  one-half  miles 
south  of  the  Howard  ranch  coal  is  mined  in  sec.  2,  T.  20  N.,  R.  8  E.     The  section  here  is  - 
as  follows: 
Section  2\  miles  south  of  the  Howard  rand,. 
Ft.    in. 
(  lay 8-14 
Lignite 8       6 
Sandy  clay 1 
Lignite 5        6 
Brown  clay :\-4 
Sandstone  ledge 1 
Fine  sand 4 
The  lignite  here  exposed  is  of  good  quality.  At  the  Bond  place,  10  miles  above  the  How- 
ard ranch,  a  7-foot  seam  occurs,  separated  by  9  incites  of  clay  from  a  3-foot  scam.  A  lignite 
bed  over  7  feet  t  hick  and  of  excellent  quality  is  exposed  on  the  Riley  ranch,  on  the  northeast 
side  and  near  the  base  of  the  Cave  Hills.  The  lignite  lies  only  a  few  feet  above  the  creek 
level  and  is  overlain  by  2  to  5  feet  of  clay.  A  bed  1  feet  thick  outcrops  several  miles  north 
of  Ludlow  and  at  other  localities  in  the  Cave  Hills. 
Lignite  i-;  present  at  various  points  along  North  Fork  of  Grand  River,  which  (lows  east- 
ward near  the  boundary  line  between  North  and  South  Dakota.  It  outcrops  2  miles  west 
of  Haley,  N.  Dak.,  where  a  seam  01  feet  thick  is  exposed  for  300  to  100  yards  in  a  cut  bank, 
the  coal  lying  1  to  0  feet  above  the  river.  Lignite  is  also  mined  I  miles  above  this  place, 
the  bed  being  5  to  0  feet  thick.  It  is  reported  to  occur  at  other  localities  on  the  North 
Fork,  both  above  and  below  Haley.  In  the  vicinity  of  Seim,  near  the  junction  of  North 
mid  South  folks  of  the  Grand,  lignite  is  plentiful.  A  5-foot  seam  is  exposed  on  Anderson's 
ranch,  about  6  miles  west  of  the  reservation  fence  and  several  miles  from  Seim. 
Lignite  along  Yellowstone  River  below  Miles  City.—  \n  the  vicinity  of  Glendive,  Mont.,  a 
bed  of  lignite  0  feet  thick  occurs  in  the  bluffs  1  mile  northeast  of  town.  The  lignite  is  in 
two  seams,  each  3  feet  thick  and  separated  by  12  inches  of  clay.  The  Sims  mine  is  opened 
in  these  seams  and  the  product  is  of  good  quality.  Much  of  the  lignite  used  in  Glendive 
comes  from  the  Snyder  mine,  8  miles  north  of  town,  being  hauled  in  by  teams.  The  seam 
is  S  feet  thick  and  in  the  immediate  vicinity  there  are  three  others  of  workable  thickness, 
as  follows: 
Lignite  beds  near  Glendive,  Mont. 
Foot. 
300  feet  above  the  river 7 
250  feet  above  the  river 8 
150  feet  above  the  river 14 
!H)  feet  above  the  river 10 
The  lignite  in  the  two  upper  beds  is  of  excellent  grade  and  considerable  areas  are  under- 
lain by  it,  as  shown  by  the  outcrops.  On  the  west  side  of  the  Yellowstone,  12  miles  abo\  e 
Glendive,  at  the  Kinsey  ranch,  near  the  mouth  of  Clear  ('reek,  a  seam  of  lignite  over  \\  feet, 
thick  has  been  mined  where  it  outcrops  in  the  hillside  about  200  feet  above  the  river. 
Across  the  river  from  Fallon,  about  3  miles  northeast  of  the  railroad  station,  a  seam  vary- 
ing in  thickness  from  8|  to  10  feet  is  exposed  at  intervals  for  a  distance  of  over  1  mile.     At 
c  Todd,  J.  E.,  Bull.  South  Dakota  Geol.  Survey,  No.  2,  p.  53. 
