140         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,    1907,   PART   II. 
development  in  and  near  the  town  of  Dietz,  and  are  designated  by 
numbers  from  the  uppermost  downward  as  Dietz  coals  Nos.  1,  2,  and 
3.  Stewart  Kennedy  believes  that  there  is  at  least  one  workable  bed 
between  the  Dietz  No.  3  coal  and  the  Monarch  bed.  This  opinion  is 
based  on  the  interpretation  of  drill  records  and  has  not  been  sup- 
ported by  other  evidence.  The  dip  of  the  rocks  eastward  from  the 
Monarch  mine  on  Tongue  River  to  the  exposure  of  the  Dietz  No.  3 
coal  on  Goose  Creek  is  very  low  and  is  not  considered  sufficient  to 
place  the  Monarch  coal  more  than  120  feet  beneath  the  Dietz  No.  3 
coal  near  the  mouth  of  Goose  Creek. 
The  Dietz  No.  3  coal  bed  is  exposed  in  only  two  prospects  near  the 
junction  of  Goose  Creek  and  Tongue  River.  Six  feet  of  coal  is  visible, 
but  at  neither  prospect  is  a  complete  section  exposed.  Mr.  Kennedy, 
who  has  prospected  this  bed,  reports  its  thickness  as  14  feet.  A 
report  from  another  source  of  a  drilling  in  the  Goose  Creek  valley  indi- 
cates nearly  the  same  thickness  for  this  bed.  An  outcrop  in  the 
SE.  i  sec.  20,  T.  57  N.,  R.  84  W.,  believed  to  be  in  the  stratigraphic 
position  of  the  Dietz  No.  3  coal,  indicates  that  the  bed  is  so  shaly 
as  to  be  of  no  value.  An  abandoned  drift  had  been  driven  80  feet 
from  the  surface  at  the  base  of  a  high  bluff  of  Goose  Creek,  in  the 
NE.  i  sec.  22,  T.  57  N.,  R.  84  W. 
The  Dietz  No.  2  coal  bed  has  received  most  attention  of  the  three. 
In  1907  it  was  being  worked  on  a  commercial  scale  at  mine  No.  5,  in 
sec.  27,  T.  57  N.,  R.  84  W.,  in  Nos.  2  and  4  mines,  at  Dietz,  and  in  No. 
3  mine  three-fourths  of  a  mile  south  of  Dietz.  In  all  these  mines  it 
has  a  thickness  of  about  8  feet  6  inches.  In  mine  No.  3  the  coal  has  a 
variable  thin  parting  of  shale  3  feet  above  the  base.  At  the  other 
localities  named  the  coal  is  not  divided  by  shale. 
The  Dietz  No.  2  coal  is  also  prospected  in  the  bluff  of  Tongue  River, 
in  the  SE.  \  SE.  \  sec.  15,  T.  57  N.,  R.  84  W. 
The  Dietz  No.  1  coal  has  been  mined  only  at  Dietz,  where  a  large 
tonnage  has  been  removed.     The  following  is  a  section  of  this  bed: 
Section  of  No.  1  coal  bed  at  Dietz. 
Shale,  gray.  Ft.    in. 
Coal 2 
Shale,  gray 1      6 
Coal 7     10 
Shale 0-1 
Coal 9 
Shale. 
Total  workable  coal 8      7 
There  is  a  probability  that  all  the  Dietz  coal  beds  decrease  in  thick- 
ness toward  the  south  from  the  vicinity  of  Dietz.  The  uplands  south 
of  Dietz  are  well  covered  with  gravel,  but  the  rocks  in  the  bluffs  of 
Goose  Creek  are  fairly  well  exposed  and  all  the  Dietz  coals  should 
show  west  of  Sheridan,  but  no  such  outcrops  have  been  noted. 
