﻿106 
  C. 
  L. 
  Baker 
  — 
  Contributions 
  to 
  the 
  

  

  it 
  is 
  sharply 
  overturned 
  and 
  in 
  fanlt 
  contact 
  with 
  the 
  

   Basement 
  Complex 
  in 
  the 
  southern 
  Manzano 
  Range 
  and 
  

   in 
  the 
  Sierra 
  de 
  los 
  Pinos, 
  east 
  of 
  which 
  overturn 
  it 
  forms 
  

   an 
  eastward 
  dip 
  slope 
  for 
  a 
  short 
  distance; 
  it 
  forms 
  the 
  

   upper 
  escarpment 
  and 
  much 
  of 
  the 
  eastern 
  dip 
  slope 
  in 
  

   the 
  Sierra 
  Oscura; 
  forms 
  the 
  top 
  of 
  the 
  outer 
  escarp- 
  

   ments 
  of 
  the 
  San 
  Andreas 
  and 
  Sacramento 
  mountains; 
  

   and 
  has 
  been 
  brought 
  to 
  the 
  surface 
  by 
  the 
  laccolithic 
  

   intrusion 
  of 
  the 
  San 
  Pedro 
  Mountains. 
  

  

  The 
  Magdalena 
  of 
  the 
  Sangre 
  de 
  Cristo 
  Mountains 
  con- 
  

   sists 
  mainly 
  of 
  a 
  remarkable 
  alternation 
  of 
  beds 
  of 
  ar- 
  

   koses 
  and 
  limestones, 
  many 
  of 
  the 
  limestone 
  beds 
  being 
  

   themselves 
  arkosic. 
  Nodular 
  and 
  lenticular 
  chert 
  is 
  

   abundant 
  in 
  the 
  limestones. 
  Real 
  shale 
  is 
  almost 
  totally 
  

   lacking; 
  sandstones 
  are 
  not 
  particularly 
  abundant. 
  A 
  

   thin 
  bed 
  of 
  sub 
  -bituminous 
  coal, 
  255 
  feet 
  above 
  the 
  base, 
  

   has 
  been 
  traced 
  for 
  15 
  miles 
  in 
  the 
  canon 
  of 
  the 
  Upper 
  

   Pecos. 
  The 
  unweathered 
  color 
  of 
  the 
  limestone 
  and 
  

   sandstone 
  is 
  some 
  shade 
  of 
  gray, 
  but 
  some 
  of 
  the 
  fine 
  

   sands 
  in 
  the 
  upper 
  Pecos 
  Valley, 
  especially 
  near 
  the 
  top 
  

   of 
  the 
  group, 
  are 
  purple, 
  red 
  and 
  green. 
  A 
  thin 
  bed 
  of 
  

   coal 
  is 
  also 
  found 
  in 
  the 
  Sierra 
  Oscura 
  and 
  a 
  number 
  of 
  

   thin 
  carbonaceous 
  layers, 
  locally 
  coal, 
  are 
  found 
  within 
  

   400 
  feet 
  of 
  the 
  top 
  in 
  the 
  Sangre 
  de 
  Cristo 
  Range. 
  

  

  The 
  Magdalena 
  group 
  covers 
  the 
  summit 
  portion 
  of 
  

   the 
  Sangre 
  de 
  Cristo 
  Range 
  of 
  New 
  Mexico 
  between 
  the 
  

   Truchas-Jicavita 
  massif 
  on 
  the 
  south 
  and 
  the 
  Wheeler 
  

   Peak 
  massif 
  on 
  the 
  north. 
  This 
  portion 
  of 
  the 
  range 
  is 
  

   lower 
  in 
  altitude 
  than 
  the 
  northern 
  and 
  southern 
  por- 
  

   tions. 
  Steeply 
  dipping 
  Magdalena 
  dark 
  green 
  micaceous 
  

   shaly 
  sandstones 
  outcrop 
  on 
  the 
  east 
  side 
  of 
  Palo 
  

   Flechado 
  (Taos) 
  Pass 
  on 
  the 
  west 
  border 
  of 
  the 
  Ute 
  

   Park 
  depression. 
  Between 
  the 
  pass 
  and 
  the 
  town 
  of 
  

   Taos 
  the 
  Magdalena 
  consists 
  of 
  folded 
  strata 
  of 
  lime- 
  

   stone, 
  conglomerate, 
  sandy 
  shales 
  and 
  sandstone. 
  The 
  

   group 
  along 
  the 
  lower 
  reaches 
  of 
  Pueblo 
  Creek, 
  a 
  short 
  

   distance 
  east 
  of 
  Taos 
  Indian 
  Pueblo, 
  dips 
  to 
  the 
  west 
  and 
  

   consists 
  of 
  dark 
  green 
  and 
  buff 
  ferruginous 
  sandstone, 
  

   conglomerate 
  and 
  gray 
  fossiliferous 
  limestone, 
  appar- 
  

   ently 
  resting 
  upon 
  the 
  crystallines 
  of 
  the 
  Wheeler 
  Peak 
  

   massif 
  farther 
  north 
  and 
  east. 
  At 
  the 
  west 
  base 
  of 
  the 
  

   mountains 
  east 
  of 
  the 
  county-seat 
  of 
  Taos, 
  the 
  Magdalena 
  

   dips 
  eastward. 
  The 
  high 
  summits 
  of 
  the 
  Truchas-Jica- 
  

   vita 
  massif 
  are 
  formed 
  of 
  Magdalena. 
  The 
  group 
  is 
  

  

  