GRAND   MESA   COAL   FIELD,    COLORADO. 
331 
Sec 
Oh 
°y 
tions  of  coal  beds 
in  £/jg  Somerset  district,  Grand  Mesa  coal  field,  Colorado — Cont'd. 
Name  and 
-  y,        Name  and 
■  y,       location  of 
Section. 
-X        location  of 
Section. 
mine. 
°^            mine. 
fcE 
fcPM 
Ft.  in. 
Ft.  in. 
4/ 
Johnson  (Por- 
(Sandstone. 
48 
Simonton 
Shale. 
ter  claims); 
Coal 
12    2 
(  Porter 
Coal 
2  10 
sec.  5,  T.  14 
41 
Shale    and    sand- 
claims); sec. 
Shale 
10 
S.,R.90W. 
stone 
57 
22,  T.  14  S., 
Coal 
1    2 
QJ 
Coal 
3     9 
R.  90  W. 
Shale 
5 
H 
Sandstone  and 
Coal 
13    1 
■z 
shale 
40 
Shale 
6 
- 
Coal 
1 
Coal 
16 
5 
Sand  s  t  o  ne  and 
Coal,  bony 
2 
(Ah 
shale 
Coal 
Sandstone 
Coal 
Sandstone 
40 
10 
85 
8 
50 
Coal 
Shale 
Shale  and  sandstone. 
7    2 
2 
12 
1 
Shale. 
20 
Coal,    metamor- 
64   6 
phosed 
Shale    and    sand- 
2 
tl 
stone  
Coal,  metamor- 
phosed  
Shale    and    sand- 
stone  
Coal 
Shale 
48 
49 
Mosley;    sec. 
10(?),  T.  13 
Shale. 
Coal 
2 
5 
0 
40 
5     7 
25 
S.,R.89\V. 
Shale 
Coal 
Bottom  not  exposed. 
12 
10 
24 
> 
Coal 
6 
Limestone,  shelly. 
3 
15 
5    5 
pq 
50 
Prospect  near 
Shale 
Coal... 
5 
Shale 
14 
Mosley  mine; 
Coal 
8 
Coal 
6 
sec.  3,  T.  14 
Sandstone 
20 
Shale,  sandy 
21 
S.,R.89W. 
Coal 
1 
Coal 
4    6 
Shale,  sandy. 
Shale,  sandy 
16 
Coal 
3 
34 
Shale. 
543     5 
Along  the  North  Fork  to  the  east  of  Somerset,  and  on  Coal  Creek 
the  coal  is  hard,  massive,  bituminous  to  anthracite,  and  of  coking 
quality,  although  recent  tests  in  the  Denver  laboratory  of  the  fuel- 
testing  plant  show  that  the  coke  is  not  of  the  best  quality.  At  the 
Mosley  mine  (No.  49)  the  coal,  10  feet  thick,  is  metamorphosed, 
probably  by  the  heat  from  an  intrusive  igneous  rock,  although  no 
such  rock  was  found  in  contact  with  it.  However,  it  is  located  in 
the  side  of  Mount  Gunnison,  at  no  great  distance  from  extensive 
masses  of  igneous  rock.  The  coal  is  hard,  black,  dull  vitreous  in 
luster,  fine  grained,  even  to  seamy  in  texture,  with  conchoidal  frac- 
ture, free  from  bone,  does  not  slack  on  exposure  to  the  weather,  and 
cokes  readily.  A  large  quantity  of  equally  good  coal  is  reported 
from  Coal  Creek,  south  of  the  area  investigated. 
Anthracite  coal  of  good  quality  occurs  in  the  south  slope  of  Mount 
Gunnison  at  an  altitude  of  9,700  feet.  Several  exposures  were 
observed,  and  the  beds  have  been  carefully  prospected  by  S.  G.  Por- 
ter. The  rocks  are  faulted,  crushed,  and  cut  by  dikes  of  igneous 
rock  to  such  an  extent  that  individual  beds  can  not  be  traced  for 
any  considerable  distance,  nor  is  the  coal  constant  in  thickness  or 
character.  An  opening,  known  as  the  Phillip  prospect,  was  started 
on  an  8-foot  bed,  but  the  coal  is  crushed  in  places,  variable  in  thick- 
ness, and  at  a  point  290  feet  from  the  opening  pinched  out  entirely. 
