LITTLE    SNAKE   RIVER    COAL   FIELD,    WYOMING. 
251 
much  more  rapidly,  having  a  cracked  or  minutely  jointed  appearance 
in  surface  exposures,  with  selenite  and  ferrous  sulphate  in  the  cracks 
and  along  the  joint  planes. 
The  coals  in  the  next  higher  coal-bearing  member  of  the  upper  coal 
group  occur  in  zones  as  much  as  60  feet  thick,  composed  of  coal  beds 
from  1  to  10  feet  thick,  separated  by  beds  of  sandstone  and  shale  of 
about  the  same  thickness.  Although  some  of  the  coal  is  clean  and 
firm,  much  of  it  is  dirty  and  shaly,  and  all  seems  to  air  slack  rapidly. 
Selenite  and  ferrous  sulphate  are  present  in  the  coal  in  large  quantities. 
Only  a  few  exposures  of  the  coals  of  the  topmost  member  of  the 
upper  coal  group  were  encountered.  The  occurrence  of  the  beds  is 
similar  to  that  in  the  next  lower  member,  but  the  coal  is  for  the  most 
part  dirty,  shaly,  and  gypsiferous.  Small  seams  of  brown  coal  appear 
among  the  beds,  showing  the  nearness  of  the  coals  to  true  lignites. 
SECTIONS  AND  ANALYSES. 
Wherever  it  was  possible  to  procure  samples  of  coal  not  too  much 
weathered,  they  were  taken  and  forwarded  to  the  fuel-testing  laboratory 
at  Pittsburg,  Pa.,  where  they  were  analyzed  under  the  direction  of  F.  M. 
Stanton.  Sampling  was  done  according  to  the  regulations  given  on 
page  12.  Detailed  sections  of  all  good  exposures  encountered  were 
measured.  The  tables  below  give  the  analyses  of  all  samples  obtained, 
sections  of  all  beds  sampled,  showing  the  thickness  of  the  bed  repre- 
sented by  the  sample,  and  a  sufficient  number  of  additional  sections 
to  represent  each  coal-bearing  zone  by  one  or  more  typical  sections. 
Analyses  of  coal  samples  from  western  part  of  Little  Snake  River  coal  field,  Wyoming. 
[¥.  M.  Stanton,  chemist  in  charge.] 
Name  of  formation. 
Laboratory  No. 
Sample  as  received: 
I  Moisture 
Volatile  matter. 
Fixed  carbon... 
f  Ash 
I\Sulphur 
Hydrogen 
Carbon 
Nitrogen 
Oxygen 
Calories 
British  thermal  units. 
Loss  of  moisture  on  air  drying. 
Air-dried  sample: 
.  [Moisture 
g  I  Volatile  matter. 
(h  I  Fixed  carbon. .. 
^  If  Ash 
{(Sulphur 
Hydrogen 
Carbon 
Nitrogen 
Oxygen 
Calories 
British  thermal  units. 
Mesaverde, 
near  base  of 
upper  member 
5297. 
2.40 
7.93 
34.  70 
•IS.  72 
8.65 
.50 
5.02 
65.32 
1.35 
19. 16 
6,286 
11,280 
5340. 
1.90 
1 1 .  95 
35.  22 
43.  97 
8.86 
1.47 
5.42 
59.93 
.91 
23.41 
:,.  B55 
lo.. 539 
Lara- 
mie. 
5324. 
19.20 
36.  46 
40.56 
3.78 
.34 
5.74 
58.88 
1.34 
29. 92 
5,401 
9,722 
2.30 
Upper  coal  group,  basal  member. 
5298.        5342.        5448.    |    5447.        5299. 
"20.68 
35.97 
33.45 
9.90 
1.11 
5.44 
51.84 
.72 
30.99 
4,843 
8,717 
5.80 
17.30 
37.32 
41.51 
3.87 
.35 
5.61 
60.27 
1.37 
28.53 
5,  528 
9,951 
15.80 
3.S.  IN 
35.51 
10.51 
1.18 
5. 10 
55.03 
.76 
27.  42 
5,141 
9,254 
25.04 
46.  74 
20.71 
7.51 
.  39 
5.55 
51.13 
.73 
34.69 
4,680 
8,424 
6.50 
19.83 
49.99 
22. 15 
8.03 
.42 
5.  17 
54.68 
.78 
30.92 
5,005 
9.010 
23.99 
28.49 
39.41 
8.11 
.97 
4,499 
8,098 
26.02 
30.08 
37.85 
6.05 
1.01 
4,641 
8,354 
9. 80       12. 80 
1.70 
15.73 
31.59 
43.69 
8.99 
1.08 
■l.'.iss 
Ft.  in. 
Thickness  of  coal 4      6 
Ft.  in. 
11      0 
Ft.  in. 
8      0 
Ft.  in. 
2      1 
Ft.  in. 
2    .5 
Ft.  in. 
6      0 
15.16 
34.49 
43.41 
6.94 
L.16 
9.. ".so 
8.71 
22.61 
58.68 
10.00 
.89 
2.  57 
69.12 
.78 
16.64 
5,851 
L0.533 
Ft.  in.    Ft.  in. 
12       0        2      2 
