354         CONTRIBUTIONS   TO   ECONOMIC   GEOLOGY,   1907,   PART   II. 
Along  the  Laramie  outcrop  on  San  Juan  River,  above  Juanita,  in 
T.  33  N.,  R.  2  W.,  there  are  several  faults  of  small  longitudinal  extent 
but  considerable  throw.  The  largest  fault  that  was  observed  in  the 
upper  part  of  the  Laramie  is  in  the  SW.  J  SW.  I  sec.  32.  This  fault 
trends  N.  25°  W.  and  shows  a  downthrow  of  about  125  feet  to  the 
southwest.  A  fault  is  evident  also  in  the  west  side  of  Archuleta  Moun- 
tain. The  only  other  fault  worthy  of  mention  is  the  one  at  Monero, 
N.  Mex.  This  fault  strikes  S.  26°  E.  from  the  northwest  corner  of 
sec.  7  to  the  southern  part  of  sec.  33,  T.  31  N.,  R.  1  E.  The  displace- 
ment amounts  to  more  than  200  feet,  the  downthrow  being  on  the 
north  side.  The  disturbance  of  the  rocks  in  this  area  has  facilitated 
erosion,  and  thus  the  area  of  workable  coal  beds  is  considerably 
reduced. 
THE   COAL. 
MESAVERDE  COAL  BEDS  IN   T.  35  N.,   R.  8  W. 
Locality  No.  1:  a  In  T.  35  N.,  R.  8  W.,  the  Mesaverde  formation 
contains  six  beds.  The  following  section,  reading  down  in  strati- 
graphic  order  from  the  upper  sandstones,  was  measured  by  Joseph  A. 
TafT  in  the  southwestern  part  of  sec.  8 : 
Section  of  Mesaverde  coal  beds  in  sec.  8,  T.  35  N.,  R.  8  W.  (No.  1). 
Ft.    in. 
Sandstone,  massive 30-40 
Sandstone,  shaly 3 
Coal 1      6 
Shale  and  shaly  sandstone 28 
Coal 1      8 
Shale 12 
Coal 2 
Shale 8 
Coal 1      3 
Shale  and  shaly  sandstone 12 
Coal 1      4 
Shale,  sandy 1 
Coal 2 
Coal,  bony 3 
Coal 10 
Shale 11 
Coal 1 
Sandstone,  massive. 
115-125     11 
Locality  No.  2:  The  coal  beds  given  in  the  section  at  locality  No.  1 
can  not  be  definitely  identified  in  other  parts  of  the  same  township. 
It  is  probable,  however,  that  the  bed  exposed  at  an  old  prospect  near 
the  center  of  the  north  side  of  sec.  18  is  the  same  as  the  top  bed  at 
a  These  numbers  correspond  to  those  on  PL  XXIII. 
