388         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART   II. 
Analyses  of  coal  samples  from  the  Harmony  coalfield,  southern  Utah. 
No.  of  coal  bed. 
Laboratory  No. 
Bed  6. 
5311 
Bed  4. 
5312 
Bed  3 
(picked 
sample) . 
5310 
Bed  3. 
5309 
Ph 
Sample  as  received: 
Moisture 
I  Volatile  matt  or 
Fixed  carbon 
fAsh 
(iSulphur 
Hydrogen 
Carbon 
Nitrogen 
[Oxygen 
Calories 
British  thermal  units. 
Loss  of  moisture  on  air  drying. 
Air-dried  sample: 
.  |  Moisture 
*-•  |  Fixed  carbon 
^  [/ Ash 
I\Sulphur 
Hydrogen 
Carbon 
Nitrogen- 
Oxygen 
Calories 
British  thermal  units. 
8.21 
4  41 
58.02 
29.36 
2.28 
2.98 
53.  31 
.90 
11.17 
4,949 
8,908 
7.02 
10.30 
60.61 
22.07 
4.06 
3.32 
62.77 
.92 
6.86 
5,782 
10, 408 
5.20 
3.60 
3.17 
3.55 
4  65 
10.69 
61.21 
62.87 
30.97 
22.89 
2.41 
4  21 
2.53 
3.03 
56.23 
65.12 
.95 
.95 
6.91 
3.80 
5,220 
5,998 
9,397 
10,796 
9.50 
13.22 
49.22 
28.06 
3.55 
3.44 
51.44 
.85 
12.66 
4,922 
4  03 
14  02 
52.19 
29.76 
3.76 
2.98 
54.55 
.90 
8.05 
5, 219 
8.29 
13.44 
45.64 
32.63 
3.17 
3.55 
48.48 
.85 
11.32 
4,575 
8,235 
3.90 
4  57 
13.99 
47.49 
33.95 
3.30 
3.25 
50.45 
.88 
8.17 
4,761 
8,569 
COLOB   FIELD. 
LOCATION. 
The  Colob  coal  field  includes  the  coal  on  the  bench  immediately 
above  the  Colob  Plateau.  It  extends  from  the  vicinity  of  Cedar  City 
and  Kanarraville,  at  the  west  end  of  the  plateau,  southeastward  to 
the  Sevier  fault  in  the  vicinity  of  Glendale  and  Mount  Carmel,  in 
the  upper  Virgin  Valley.  The  outcrop  of  the  coal  beds  follows  a 
tortuous  course  around  the  dissected  margin  of  the  plateau  and 
throughout  the  larger  part  of  the  area  occurs  in  the  face  of  steep 
cliffs  and  is  difficult  of  approach,  but  where  the  coal  passes  beneath 
the  surface  in  the  valleys  of  the  larger  streams  it  is  more  easily 
accessible.  In  the  eastern  part  of  the  field,  especially,  and  locally  at 
the  extreme  west  the  coal  can  be  conveniently  reached.  In  the 
central  part  of  the  Colob  field,  however,  the  problem  of  transporting 
the  coal  from  its  outcrop  in  the  face  of  cliffs  across  the  dissected 
upland  presents  many  difficulties. 
OCCURRENCE    AND    THICKNESS    OF    COAL. 
The  coal  in  the  Colob  field  occurs  in  the  lower  few  hundred  feet 
of  the  Cretaceous  section  in  rocks  of  Colorado  age.  Several  beds 
have  been  found  at  different  horizons,  but  the  field  has  been  pros- 
pected in  only  a  few  places  and  much  remains  to  be  learned  concern- 
ing the  occurrence  of  the  coal.  The  work  of  the  last  season  demon- 
strated, however,  that  no  bed  can  be  traced  continuously  throughout 
