﻿60 
  E. 
  Bose 
  — 
  Ammonoids. 
  

  

  ably 
  underlain 
  by 
  the 
  Yeso 
  formation 
  and 
  forms 
  the 
  base 
  

   of 
  the 
  continental 
  Trias. 
  The 
  Grlorieta 
  sandstone 
  is 
  a 
  

   rather 
  constant 
  member 
  of 
  the 
  Trias 
  ; 
  it 
  can 
  be 
  followed 
  

   eastward 
  to 
  the 
  Pecos 
  Valley 
  in 
  the 
  region 
  between 
  

   Anton 
  Chico, 
  Santa 
  Rosa 
  and 
  Puerto 
  de 
  Luna, 
  where 
  it 
  

   frequently 
  contains 
  bones 
  of 
  reptiles 
  and 
  shells 
  of 
  Unio 
  

   and 
  Anodonta. 
  

  

  The 
  result 
  thus 
  gained 
  appears 
  to 
  make 
  it 
  necessary 
  to 
  

   abandon 
  the 
  name 
  "Manzano 
  group/ 
  ' 
  as 
  this 
  term 
  would 
  

   include 
  Pennsylvanian 
  and 
  Permian 
  beds. 
  Perhaps 
  

   "Manzano 
  group" 
  could 
  be 
  restricted 
  to 
  the 
  Yeso 
  and 
  

   San 
  Andreas 
  formations, 
  while 
  the 
  Abo 
  sandstone 
  could 
  

   be 
  united 
  with 
  the 
  lower 
  series, 
  the 
  Magdalena 
  beds. 
  

  

  We 
  have 
  here 
  one 
  of 
  the 
  rather 
  frequent 
  cases 
  in 
  which 
  

   unconformities 
  do 
  not 
  always 
  separate 
  two 
  different 
  

   series 
  but 
  divide 
  formations 
  which 
  belong 
  to 
  the 
  same 
  

   series, 
  their 
  contacts 
  being 
  entirely 
  concordant. 
  I 
  have 
  

   already 
  had 
  an 
  opportunity 
  to 
  cite 
  a 
  similar 
  case 
  in 
  the 
  

   Glass 
  Mountains 
  of 
  western 
  Texas 
  where 
  an 
  unconform- 
  

   ity 
  traverses 
  the 
  lower 
  part 
  of 
  the 
  Permian, 
  while 
  the 
  

   lowest 
  beds 
  of 
  this 
  system 
  rest 
  conformably 
  on 
  the 
  

   Schwagerina 
  beds 
  of 
  the 
  Uralian. 
  

  

  Santa 
  Bosa, 
  New 
  Mexico. 
  

   November 
  6, 
  1919. 
  

  

  