﻿Geology. 
  305 
  

  

  neighborhood 
  of 
  Espinazito 
  and 
  Aconcagua 
  to 
  the 
  Collon 
  Cura 
  

   Biver, 
  or 
  S. 
  lat. 
  32° 
  to 
  41°. 
  The 
  southern 
  area, 
  in 
  which 
  f 
  ossi- 
  

   ferous 
  rocks 
  of 
  Lower 
  Cretaceous 
  age 
  are 
  known 
  at 
  scattered 
  

   localities, 
  extends 
  from 
  Lake 
  Pueyrredon 
  to 
  Terra 
  del 
  Fuego, 
  or 
  

   about 
  S. 
  lat, 
  47° 
  30V 
  to 
  54°. 
  Little 
  is 
  known 
  about 
  the 
  stretch 
  

   of 
  over 
  400 
  miles 
  between 
  these 
  two 
  areas 
  but 
  there 
  are 
  reasons 
  

   for 
  believing 
  that 
  Lower 
  Cretaceous 
  deposits 
  are 
  lacking 
  there. 
  

  

  The 
  faunas 
  of 
  the 
  two 
  areas 
  mentioned 
  appear 
  to 
  have 
  no 
  spe- 
  

   cies 
  in 
  common, 
  though 
  the 
  genera 
  represented, 
  especially 
  among 
  

   the 
  pelecypods, 
  are 
  largely 
  the 
  same 
  in 
  both. 
  Windhausen 
  

   believes 
  that 
  the 
  same 
  general 
  divisions 
  of 
  the 
  Lower 
  Cretaceous 
  

   are 
  present 
  in 
  both 
  areas 
  and 
  attributes 
  the 
  differences 
  in 
  f 
  aunal 
  

   facies 
  to 
  differences 
  in 
  depth, 
  classifying 
  the 
  northern 
  region 
  as 
  

   neritic 
  facies 
  and 
  the 
  southern 
  region 
  as 
  bathyal 
  facies. 
  He 
  

   presents 
  the 
  stratigraphy 
  of 
  the 
  northern 
  region 
  and 
  the 
  tenta- 
  

   tive 
  correlation 
  and 
  stratigraphic 
  succession 
  of 
  the 
  southern 
  

   region 
  in 
  the 
  accompanying 
  table. 
  

  

  The 
  stratigraphic 
  position 
  of 
  the 
  Belgrano 
  beds, 
  which 
  are 
  

   found 
  in 
  the 
  neighborhood 
  of 
  Lake 
  Pueyrredon, 
  is 
  conjectural 
  

   because 
  their 
  characteristic 
  ammonite 
  genus, 
  Hatchericeras, 
  is 
  

   not 
  known 
  outside 
  of 
  the 
  southern 
  area. 
  

  

  The 
  author 
  discusses 
  in 
  some 
  detail 
  the 
  ammonite 
  faunas 
  of 
  

   the 
  different 
  divisions 
  of 
  the 
  Neocomian 
  and 
  points 
  out 
  the 
  

   importance 
  of 
  the 
  southern 
  Trigonia 
  fauna, 
  or 
  "fauna 
  of 
  

   bivalves 
  and 
  gastropods, 
  ' 
  ' 
  which 
  includes 
  forms 
  similar 
  to 
  those 
  

   found 
  in 
  the 
  Malone 
  formation 
  of 
  Texas 
  and 
  in 
  the 
  Uitenhage 
  

   formation 
  of 
  South 
  Africa. 
  Concerning 
  the 
  south 
  Andean 
  

   Lower 
  Cretaceous 
  fauna 
  as 
  a 
  whole, 
  he 
  finds 
  that 
  its 
  closest 
  rela- 
  

   tionship 
  is 
  with 
  the 
  faunas 
  of 
  the 
  Mediterranean-Caucasian 
  and 
  

   Himalayan 
  region 
  which 
  Haug 
  has 
  combined 
  under 
  the 
  term 
  

   equatorial 
  fauna, 
  He 
  questions 
  the 
  identification 
  by 
  R. 
  Douville 
  

   and 
  others 
  of 
  true 
  boreal 
  types 
  in 
  the 
  Argentine 
  Lower 
  Creta- 
  

   ceous 
  but 
  sees 
  independent 
  (autochthonous) 
  elements 
  in 
  such 
  

   forms 
  as 
  Steueroceras, 
  Beriasella, 
  Hatchericeras, 
  and 
  others 
  

   which 
  with 
  additional 
  evidence 
  from 
  future 
  investigations 
  may 
  

   justify 
  the 
  recognition 
  of 
  an 
  austral 
  faunal 
  province. 
  These 
  

   independent 
  elements 
  may 
  have 
  developed 
  off 
  the 
  northern 
  coasts 
  

   of 
  Archinotis, 
  as 
  Ihering 
  has 
  named 
  the 
  ancient 
  Antarctic 
  conti- 
  

   nent. 
  The 
  coasts 
  of 
  Archinotis 
  may 
  likewise 
  have 
  been 
  the 
  route 
  

   of 
  migration 
  connecting 
  the 
  southern 
  parts 
  of 
  the 
  earth 
  and 
  thus 
  

   aiding 
  in 
  the 
  interchange 
  of 
  faunas 
  between 
  the 
  Himalayan 
  and 
  

   south 
  Andean 
  regions 
  during 
  the 
  Tithonian 
  and 
  Neocomian. 
  

  

  T. 
  W. 
  Stanton. 
  

  

  2. 
  The 
  Ter 
  mo 
  -Carboniferous 
  Ammonoids 
  of 
  the 
  Glass 
  Moun- 
  

   tains, 
  West 
  Texas, 
  and 
  their 
  stratigraphical 
  Significance; 
  by 
  

   Emil 
  Bose. 
  Univ. 
  of 
  Texas, 
  Bull. 
  1762, 
  pp. 
  241, 
  11 
  pis.— 
  The 
  

   date 
  of 
  this 
  publication 
  is 
  given 
  as 
  November 
  5, 
  1917, 
  evidently 
  

   to 
  comply 
  with 
  the 
  postal 
  laws, 
  yet 
  we 
  note 
  a 
  date 
  on 
  the 
  inside 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XLVII, 
  No. 
  280.— 
  April, 
  1919. 
  

   21 
  

  

  