﻿W. 
  T. 
  Lee 
  — 
  Notes 
  on 
  the 
  Manzano 
  Group. 
  325 
  

  

  these 
  conglomerates 
  with 
  those 
  farther 
  south 
  has 
  been 
  

   made 
  but 
  the 
  occurrence 
  of 
  fossiliferous 
  marine 
  lime- 
  

   stone 
  of 
  Pennsylvanian 
  age 
  in 
  the 
  vicinity 
  of 
  these 
  thick 
  

   conglomerates 
  of 
  post-Pennsylvanian 
  age 
  implies 
  that 
  

   the 
  uplift 
  raised 
  mountains 
  out 
  of 
  the 
  Pennsylvanian 
  sea 
  

   which 
  were 
  comparable 
  in 
  bulk 
  to 
  the 
  present 
  Rocky 
  

   Mountains. 
  

  

  Closely 
  connected 
  with 
  the 
  significance 
  of 
  the 
  uncon- 
  

   formity 
  is 
  the 
  second 
  question, 
  viz., 
  the 
  age 
  of 
  the 
  Man- 
  

   zano 
  group. 
  As 
  early 
  as 
  1909 
  when 
  the 
  group 
  was 
  

   named 
  it 
  was 
  pointed 
  out 
  (p. 
  33 
  of 
  the 
  Manzano 
  Bulletin) 
  

   that 
  certain 
  fossil 
  plants, 
  from 
  beds 
  now 
  known 
  to 
  be 
  

   Manzano, 
  suggested 
  Permian 
  or 
  Triassic 
  age. 
  However, 
  

   the 
  invertebrate 
  evidence 
  as 
  interpreted 
  at 
  that 
  time 
  

   seemed 
  in 
  favor 
  of 
  the 
  Pennsylvanian 
  age 
  of 
  the 
  group. 
  

   Soon 
  after 
  this 
  original 
  publication 
  by 
  Lee 
  and 
  Girty 
  

   the 
  growing 
  evidence, 
  both 
  from 
  plants 
  and 
  inverte- 
  

   brates, 
  was 
  such 
  that 
  the 
  Permian 
  age 
  of 
  the 
  Manzano 
  

   group 
  was 
  generally 
  accepted 
  and 
  this 
  attitude 
  was 
  

   reflected 
  in 
  the 
  abstract 
  by 
  Lee 
  just 
  referred 
  to. 
  Noth- 
  

   ing, 
  however, 
  came 
  forward 
  to 
  bring 
  the 
  question 
  to 
  a 
  

   definite 
  decision 
  on 
  the 
  Geological 
  Survey 
  until 
  July, 
  

   1919, 
  when 
  N. 
  H. 
  Darton's 
  reference 
  of 
  the 
  Manzano 
  

   group 
  to 
  the 
  Permian 
  was 
  approved 
  for 
  a 
  comprehensive 
  

   paper 
  on 
  the 
  geology 
  of 
  New 
  Mexico 
  now 
  in 
  a 
  final 
  stage 
  

   of 
  preparation. 
  

  

  In 
  this 
  connection 
  it 
  may 
  be 
  mentioned 
  that 
  the 
  opinion 
  

   that 
  this 
  unconformity 
  "appropriately 
  constitutes 
  the 
  

   division 
  between 
  Pennsylvanian 
  and 
  Permian 
  time" 
  

   finds 
  sanction 
  on 
  the 
  U. 
  S. 
  Geological 
  Survey, 
  whereas 
  

   Bose 
  concludes 
  that 
  the 
  ammonoides 
  found 
  at 
  Tularosa, 
  

   New 
  Mexico, 
  200 
  feet 
  above 
  the 
  base 
  of 
  the 
  Abo, 
  the 
  basal 
  

   formation 
  of 
  the 
  Manzano 
  group, 
  throw 
  this 
  formation 
  

   into 
  the 
  Pennsylvanian 
  series. 
  If 
  this 
  relationship 
  were 
  

   established 
  a 
  major 
  unconformity 
  would 
  be 
  included 
  

   within 
  the 
  Pennsylvanian 
  series 
  and 
  the 
  Pennsylvanian- 
  

   Permian 
  boundary 
  would 
  fall 
  at 
  some 
  undetermined 
  

   horizon 
  within 
  a 
  group 
  of 
  conformable 
  strata. 
  This 
  

   raises 
  a 
  serious 
  problem 
  in 
  classification 
  which 
  is 
  too 
  

   involved 
  to 
  be 
  discussed 
  here. 
  

  

  The 
  illuminating 
  observations 
  relative 
  to 
  the 
  Triassic 
  

   sedimentaries 
  are 
  of 
  great 
  interest. 
  The 
  sandstone, 
  

   which 
  caps 
  Glorieta 
  Mesa 
  and 
  is 
  widely 
  distributed 
  

   farther 
  to 
  the 
  south 
  and 
  east, 
  is 
  correlated 
  by 
  Baker 
  

   with 
  the 
  Shinarump 
  conglomerate, 
  a 
  formation 
  now 
  

  

  