26  CONTRIBUTIONS  TO  ECONOMIC   GEOLOGY,  1907,  PART  II. 
Some  detailed  sections  of  members  of  this  group  follow: 
Section  of  bluff  on  west  bank  of  Little  Missouri  River  500  feet  south  of  south  line  of 
T.  139  N.,  R.  102  W. 
Ft.    in. 
Sandstone,  yellowish  white,  soft,  and  gray  sandy  clay 145 
Lignite 6       6 
Shale,  brown 1      7 
C  >H  Lignite G 
Shale,  brown  and  gray 1      7 
Lignite,  upper  10  inches  dirty 3 
Clay  and  sandstone - 40 
{Lignite,  soft  and  powdery 1      2 
Clay,  gray 2      3 
Lignite,  weathered 2     10 
Clay,  buff 17      6 
Shale,  carbonaceous 4      2 
Clay,  yellow,  sandy 27      6 
Lignite 1 
Clay,  light  colored •. .  17 
Shale,  carbonaceous 1      1 
Clay 9 
Clinker  and  concealed  to  river  level 20 
Total  lignite 15 
Section  of  two  lower  members  of  Medora  group  near  Custer  Trail  ranch,  in  the  SE.  \ 
sec.  15,  T.  139  N.,  R.  102  W. 
Shale,  carbonaceous.  Ft.    in. 
Lignite 1        6 
Shale • 6-11 
Bed  C I  Lignite 6        6 
Clay,  brown 1 
.Lignite 5      10 
Clay,  sandy 40 
Bed  B :  Lignite 6       6 
Clay,  sandy 66       6 
Clay,  carbonaceous 3       6 
Clay,  sandy,  to  level  of  river 10 
Total  lignite 20  4 
Section  at  Medora,  in  the  NW.  \  sec.  26,  T.  140  N.,  R.  102  W. 
Shale,  brown.  Ft  in 
Bed  D :  Lignite 4  6 
Shale,  clay,  and  sandstone 30 
'Lignite 8  2 
Bed  C  J  Clay,  white 3 
[Lignite 11 
Clay,  sandy,  to  river  level 40 
Total  lignite 13 
a  125  feet  above  river  level. 
