GREAT   DIVIDE   BASIN    COAL  FIELD,    WYOMING. 
235 
the  Green  Mountains  many  of  the  granite  bowlders  are  6  feet  in 
diameter.  The  coal-bearing  portion  of  the  Wasatch  immediately 
overlies  this  basal  member  and  is  present  in  the  southern  and  western 
parts  of  the  field  only.  Lithologically  it  resembles  the  upper  member 
of  the  undifferentiated  Tertiary,  except  that  the  shales  have  a  slightly 
more  pronounced  color.  The  coal  beds  lie  nearly  horizontal,  and  their 
edges  are  in  many  places  concealed  by  clinkers  due  to  the  burning  of 
the  coal. 
Several  prospect  pits  have  been  opened  by  the  Union  Pacific  Rail- 
road Company,  and  from  them  most  of  the  following  sections  were 
taken : 
Sections  of  coal  beds  of  the  Wasatch  formation. 
No.  on 
PI. 
XII. 
Location. 
Section  of  coal  bed. 
Remarks. 
Sec. 
T. 
R. 
53 
SE.  i  NW.  \. 
28 
24 
9G 
Ft.  in. 
Shale 6 
Coal 2    G 
Shale 5 
Coal 1 
Prospect  opened  by  sheep  herd- 
ers. 
9 
54 
SW.  1  SW.  \. 
19 
24  j  95 
Shale 1    6+ 
Coal,  bony 1    6 
Shale 2    6 
Coal 3    6 
Surface  prospect. 
94- 
55 
NW.JNW.J. 
2 
22 
95 
Shale. 
Coal,  good 5    3 
Shale. 
Surface  prospect. 
56 
NE.  i  SE.£. 
21 
23 
94 
Sandstone 7 
Shale 3 
Coal,  good 5  10 
Surface  prospect. 
G    8 
NE.  }SE.  J. 
23 
22 
94 
Coal 10 
Shale 1 
57 
Coal 4 
Shale 1 
Coal   2 
Surface  prospect. 
Coal,  impure 10 
Coal 5.6+ 
9    8+ 
58 
NE.JNW.J. 
29 
22 
94 
Shale. 
Coal,  bony 2    7 
Coal,  good G  10 
Surface  exposure. 
9    5 
59 
NE.  iJNE.  i. 
1 
21 
94 
Shale. 
Coal,  fair 3    4 
Shale  and  sandstone...    5    4 
Coal,  fair 1     4 
Shale,  sandy 9 
Coal,  poor 3 
19    3 
Surface  exposure. 
GO 
SW.  J  SW.  J. 
3 
21 
94 
Sandstone 1 
Coal G 
Shale 4 
Coal,  good 4    3 
Shale 3    3 
Coal,  good 1    4 
Bone 5 
Surface  exposure. 
M    0 
