﻿196 
  EEPOET 
  UNITED 
  STATES 
  GEOLOGICAL 
  SURVEY. 
  

  

  underlj'ing 
  the 
  lower 
  outcrop 
  of 
  coal. 
  At 
  the 
  different 
  banks 
  local 
  

   changes 
  have 
  taken 
  place, 
  and 
  detail 
  sections 
  were 
  therefore 
  made. 
  

  

  ir. 
  Riffenburg 
  bank. 
  Section 
  XV. 
  

  

  Ft. 
  In. 
  

  

  li. 
  Yellow 
  sandstone 
  6 
  

  

  g. 
  Greyish 
  yellow 
  shales, 
  with 
  coaled 
  remains 
  of 
  plants 
  7 
  C 
  

  

  /. 
  Coal 
  .,.-. 
  = 
  .. 
  9 
  3 
  

  

  e. 
  Light-yellow, 
  middle-grained 
  sandstone 
  8 
  

  

  d. 
  Yellowish-grey 
  shales, 
  laminated 
  14 
  

  

  C.Coal 
  2 
  9 
  

  

  T). 
  Grey 
  shales 
  6 
  

  

  a. 
  Yellow 
  sandstone 
  in 
  bed 
  of 
  small 
  creek 
  4 
  

  

  At 
  Blum's 
  bank 
  the 
  coal 
  is 
  9 
  feet 
  in 
  thickness, 
  and 
  is 
  the 
  same 
  as 
  / 
  

   in 
  the 
  preceding 
  section. 
  Another 
  mine 
  located 
  on 
  this 
  largest 
  coal-bed 
  

   is 
  that 
  of 
  the 
  — 
  

  

  III. 
  Hunger 
  and 
  Broomfield 
  bank. 
  Section 
  XVI. 
  

  

  Ft. 
  In. 
  

  

  Tc. 
  Greyish-yellow 
  shales, 
  laminated 
  8 
  

  

  *. 
  Coal 
  , 
  3 
  3 
  

  

  h. 
  Dark-grey 
  coaly 
  shales 
  9 
  

  

  g. 
  Coal 
  .' 
  11 
  

  

  /. 
  Yellowish 
  shales, 
  sandy, 
  containing 
  coaled 
  remnants 
  of 
  

  

  plants 
  ,.. 
  18 
  

  

  e. 
  Coal 
  .-.-. 
  9 
  9 
  

  

  d. 
  Light-yellow 
  sandstone 
  4 
  

  

  c. 
  Coal 
  1 
  4 
  

  

  1). 
  Very 
  shaly 
  sandstones, 
  showing 
  lamination, 
  no 
  stratifi- 
  

   cation 
  , 
  11 
  6 
  

  

  a. 
  Coal 
  1 
  4 
  

  

  Above 
  li 
  a 
  few 
  thin 
  seams 
  of 
  coal 
  set 
  in 
  that 
  are 
  of 
  no 
  value, 
  how- 
  

   ever, 
  for 
  mining 
  purposes. 
  They 
  are 
  too 
  insignificant, 
  and 
  the 
  coal 
  is 
  

   shaly. 
  . 
  . 
  j 
  

  

  At 
  the 
  Stephens 
  bank 
  the 
  thickness 
  of 
  this 
  main 
  bed 
  of 
  coal 
  is 
  9 
  

   feet. 
  It 
  is 
  there 
  overlaid 
  by 
  IG 
  feet 
  of 
  greyish-brown 
  shales. 
  For 
  

   comparison 
  of 
  the 
  series. 
  Section 
  XVII 
  is 
  introduced 
  on 
  the 
  same 
  plate 
  

   with 
  the 
  two 
  preceding 
  ones. 
  It 
  is 
  a 
  vertical 
  projection 
  of 
  Section 
  XIV. 
  

  

  Above 
  the 
  second 
  heavier 
  bed 
  of 
  coal, 
  the 
  one 
  usually 
  measuring 
  

   between 
  3 
  and 
  4 
  feet, 
  a 
  series 
  of 
  shales 
  nearly 
  50 
  feet 
  in 
  thickness 
  sets 
  

   in. 
  A 
  heavy 
  white 
  sandstone 
  covers 
  these 
  shales 
  and 
  forms 
  the 
  foot- 
  

   wall 
  for 
  a 
  coal-bed. 
  Alternating 
  shales 
  and 
  sandstones 
  then 
  occur, 
  

   high' 
  r 
  up, 
  containing 
  a 
  number 
  of 
  thin 
  coal-seams 
  that 
  are 
  not 
  worked. 
  

   We 
  have, 
  therefore, 
  two 
  horizons 
  for 
  coal 
  in 
  this 
  region, 
  the 
  lower 
  one 
  

   with 
  the 
  heavier 
  beds, 
  and 
  the 
  upper 
  with 
  but 
  thin 
  layers 
  of 
  the 
  mineral. 
  

   They 
  all 
  belong 
  to 
  one 
  continuous 
  series, 
  however. 
  A 
  map 
  of 
  the 
  

   region 
  immediately 
  south 
  of 
  Trinidad 
  will 
  furnish 
  some 
  idea 
  as 
  to 
  the 
  

   occurrence 
  of 
  the 
  Cretaceous 
  beds, 
  of 
  the 
  coal-bearing 
  group, 
  and 
  of 
  the 
  

   line 
  of 
  outcrop 
  as 
  followed 
  by 
  the 
  main 
  bed 
  of 
  coal. 
  The 
  dips, 
  as 
  

   observed, 
  are 
  indicated. 
  It 
  will 
  be 
  seen 
  from 
  this 
  map 
  that 
  the 
  remu- 
  

   nerative 
  coal 
  horizon 
  has 
  an 
  equally 
  good 
  counterpart 
  on 
  the 
  north 
  side 
  

   of 
  the 
  Purgatorio. 
  Although 
  indications 
  occur 
  there, 
  no 
  workable 
  

   banks 
  have 
  been 
  located 
  as 
  yet 
  until 
  we 
  reach 
  the 
  vicinity 
  of 
  the 
  Eio 
  

   Cucharas. 
  

  

  On 
  this 
  river, 
  about 
  a 
  mile 
  above 
  Walsenburg, 
  several 
  openings 
  

   have 
  been 
  made, 
  furnishing 
  coal 
  that 
  is 
  utilized 
  by 
  the 
  blacksmiths 
  of 
  

  

  