314 
CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART  II. 
SUMMARY   OF   THE   HENRYS   FORK   FIELD. 
Coal  is  rather  widely  distributed  both  stratigraphically  and  geo- 
graphically in  the  Henrys  Fork  valley.  Little  effort  has  yet  been 
made  to  develop  or  even  to  prospect  the  beds,  probably  owing  to  the 
fact  that  timber  is  plentiful  and  not  hard  to  get.  With  the  possible 
exception  of  the  beds  at  Linwood,  no  coal  beds  of  unusual  thickness 
or  importance  are  known  to  exist  there.  Many  of  the  reported  beds 
are  probably  thin,  and  the  Tertiary  coal  is  of  a  rather  light  weight 
(subbituminous)  variety.  The  most  promising  part  of  the  field  is 
thought  to  be  in  Spring  Creek  valley  east  of  Green  River,  just  north 
of  Flaming  Gorge,  in  the  Mesaverde  rocks  that  are  exposed  in  that 
locality.  It  must  be  admitted,  however,  that  the  examination  of 
this  section  of  strata  was  too  incomplete  to  warrant  any  estimate  of 
the  quality  or  total  quantity  of  the  coal. 
ANALYSES. 
The  character  of  the  coal  from  the  several  fields  discussed  in  this 
paper  is  indicated  by  the  subjoined  analyses,  which  were  made  at  the 
Survey  fuel-testing  plant,  Pittsburg,  Pa. 
Analyses  of  coal  samples  from  the  Uinta  Basin,  Colorado  and  Utah. 
[F.  M.  Stanton,  chemist  in  charge.] 
Name 
Yampa. 
Lower  White  River. 
Ver 
nal. 
Geologic  age  or  formation.  J 
Post- 
La  ra- 
mie. 
Mesaverde. 
Mesaverde. 
Mancos. 
Labor 
atory  No 
5514 
3463 
34(31 
3462 
5516 
5519 
5520 
5511 
5753 
SampJ 
e  as  received: 
[Moisture 
17.46 
28.21 
47.17 
7.16 
1.14 
5.66 
56.33 
.79 
28.92 
5,391 
9,704 
14.65 
34  73 
44.48 
6.14 
.99 
5.80 
60.07 
1.10 
25.90 
5,869 
10,564 
13.31 
35.18 
46.53 
4.98 
.90 
12.31 
36.17 
45.40 
6.12 
1.10 
5.75 
62.72 
1.16 
23.15 
6,163 
11,093 
10.96 
33.13 
47.05 
8.86 
.73 
'"5,"  939' 
10,690 
11.39 
32.36 
48.44 
7.81 
.45 
5.48 
62.64 
1.14 
22.48 
5,965 
10, 737 
14.10 
31.83 
48.81 
5.26 
.38 
5.65 
62.15 
1.06 
25.50 
6, 075 
10,935 
8.46 
34.32 
47.17 
10.05 
1.58 
5.33 
62.79 
1.00 
19.25 
6,250 
11,250 
8.64 
I) 
Volatile  matter 
Fixed  carbon 
fAsh 
36.42 
47.62 
7.32 
\Sulphur 
1.25 
Hydrogen 
5.57 
P^ 
Carbon 
65.55 
Nitrogen 
1.09 
Oxygen 
19.22 
Ca 
Bi 
lories 
6,600 
itish  thermal  units. . . 
11, 880 
Loss  of  moisture  on  air  dry- 
ing   
5.70 
5.30 
4.50 
4.00 
3.20 
3.10 
4.80 
2.90 
2.60 
Air-dr 
led  sample: 
Moisture 
12.47 
29.92 
50.  02 
7.59 
1.21 
5.33 
59.74 
.84 
25.29 
5,717 
10,291 
9.87 
36.68 
46.97 
6.48 
1.05 
5.50 
63.43 
1.16 
22.38 
6,197 
11, 155 
9.23 
36.84 
48.72 
5.21 
.94 
8.66 
37.68 
47.29 
6.37 
1.15 
5.53 
65.33 
1.21 
20.41 
6,420 
11,555 
8.02 
34.22 
48.61 
9.15 
.75 
""6,'i35" 
11,043 
8.55 
33.40 
49.99 
8.06 
.46 
5.30 
64.65 
1.18 
20.35 
6,156 
11,080 
9.77 
33.43 
51.27 
5.53 
.40 
5.38 
65.28 
1.11 
22.30 
6,381 
11, 486 
5.73 
35.34 
48.58 
10.35 
1.63 
5.16 
64.66 
1.03 
17.17 
6,437 
11,586 
6.20 
ll 
Volatile  matter 
Fixed  carbon 
LfAsh 
37.39 
48.89 
7.52 
\Sulphur 
Hydrogen 
1.28 
5.42 
S, 
Carbon 
67.30 
P 
Nitrogen 
1.12 
Oxygen 
17.36 
Ca 
Bi 
Thick] 
Thick] 
lories 
6,776 
•itish  thermal  units. . . 
less  of  coal  bed 
less  of  part  sampled . . 
12, 197 
Ft.  in. 
11      4 
11      4 
Ft.  in. 
20      3 
5      7 
Ft.  in. 
9 
7 
Ft.  in. 
7    10 
5      5 
Ft.  in. 
4      2 
3      8 
Ft.  in. 
11    11 
11    11 
Ft.  in. 
11    11 
7      4 
Ft.  in. 
6      7 
3    10 
Ft.  in. 
6      7 
3      9 
