326 
CONTRIBUTIONS    TO    ECONOMIC    GEOLOGY,  1005. 
account  of  this  horizontality  of  the  rocks  and  the  descent  of  the  stream,  the  beds  of  lignite 
which  were  observed  occur  in  various  parts  of  the  stratigraphic  column.  Although  they 
are  scattered  through  the  great  mass  of  sediments  somewhat  irregularly,  there  appear  to  be 
six  distinct  horizons  at  which  considerable  quantities  of  lignite  were  seen.  These  are  shown 
in  the  following  table: 
Lignite  seams  along  thi  valley  of  Little  Missouri  River  between  Medora  and  Missouri  Hirer. a 
Eleva- 
Thick- 
iion  <>r 
out 
Materials 
Location  of  outcrop. 
ness  of 
above  and  be 
Exteni  of  outcrop. 
Remarks. 
seam. 
crop 
above 
river. 
low  lignite. 
GROT  P    \. 
Feet. 
Feet. 
\  [ ,  •  i ,  i  n  t 
8 
50  60 
7  rods 
8  seams  of  coal  re- 
ported  from  this 
point. 
1    miles   north   of   Medora; 
Burgess's  ranch. 
10 
225 
Clay 
2  rods 
This  scam  proba- 
bly  above    those 
.it  Medora. 
Burgess's 
l  5 
L00 
Probably  the  same 
as  at  Medora. 
GROUP   !'•. 
<  >pposite  Burgess's  house. . . 
.;  s 
0  16 
Clay 
Several  rods 
")  miles  below  Burgess's 
Clay  ;in<l  sand- 
stone. 
At   intervals    tor 
miles. 
St  rat;:  undulating. 
Near  Young's  ranch 
.'   i 
to  60 
Clay 
Seen  in  ravines. .  . 
Between  Young's  and  John- 
son's. 
Several  t  hin  seams. 
GROT  P  <  . 
3  miles  soul  h  of  Mikkleson  . .  . 
2 
ii 
A  1  1  u  v  i  u  m 
1   2  mil'  s 
1'robably           other 
abovi  . 
seams    cut     away 
above  by  the 
river. 
1  mile  south  of  Mikkleson  .  . . 
16 
('') 
('  1  :i  \       1  h  i  ii 
covering. 
■">(>  rods 
Lowest  seam  may 
be  equivalent  to 
one  ::  miles  south 
of  Mikkleson. 
2\  miles  below  Mikkleson 
16 
2 
Clay 
15  rods  (1  mil<   be 
low.  HI  rods  i. 
Coal    is    burned    in 
many  places. 
Read's  ranch,  7-8  miles  north 
"i  Mikkleson. 
!   " 
|    d  6  7 
no 
Sandj  clay  . .  . 
p.  mile;  all  bluffs 
along  the  river 
1     below  Mikkleson 
Sandstone  below 
lignite  in  some 
places. 
GROUP   D. 
r '  Ireek,  10  miles  above 
L0  12 
(e) 
sepa 
20  rods  and  j  mile. 
10  foot     seam       re- 
mouth. 
r  a  t  e  d  l>  y 
c  1  a  y  a  nd 
sandstom  . 
ported  from  this 
vicinity. 
',  mile  north  of  Read's  ranch 
3 
0 
S  a  11  (1  S  1  0  II  e 
Seen    ;it    several 
TWO      thin      seams 
above. 
points  for  a  mile 
or  more. 
above  this  may 
represent  the 
seams  at  Read's. 
Opposite  Morgan's  ram 
6  s 
20  30 
Sandj       clay 
1  rods 
Two     other    seams 
miles  below  Read's. 
above;  clay 
conta  ining 
iron  concre- 
tions below. 
below  1  his  one.  of 
2J  and  A  feet,  re- 
spectively 
Just  above  the  mouth  of  Bea- 
3-4 
30  to 
Sandy  clays .  . 
1  mile 
These    seams     Were 
ver  (reek. 
followed  <i  miles 
down  the  river. 
GROUP   E. 
f          3 
(The  lower  seam  be- 
It  miles   north    of    Beaver 
Creek,  near  Bolan  (nek. 
1           4 
5 
1         10 
!<  laj  s,    sandy 
I    clays. 
Several    rods    in 
each  case. 
longs  to  Group  E. 
The    upper    three 
probably    belong 
|     to  Croup  D. 
a  Wood,  L.  II.,  Third  Bienn.  Kept.  Geol.  Survej  North  Dakota,  pp.  KW-108. 
l>  Four  seams;   lowest  at  water  level. 
i  In  bluff. 
d  In  draw. 
«  Four  seams  above  water  level. 
