﻿Geology. 
  387 
  

  

  Accordingly 
  it 
  does 
  not 
  seem 
  necessary 
  to 
  give, 
  at 
  the 
  present 
  

   time, 
  a 
  detailed 
  account 
  of 
  the 
  scope 
  and 
  salient 
  features 
  of 
  this 
  

   deservedly 
  popular 
  book. 
  The 
  preface 
  to 
  the 
  latest 
  edition, 
  

   which 
  is 
  signed 
  by 
  Anne 
  Sewell 
  Young, 
  consists 
  of 
  the 
  following 
  

   single, 
  explanatory 
  sentence 
  : 
  ' 
  ' 
  While 
  the 
  greater 
  part 
  of 
  the 
  

   text 
  remains 
  as 
  it 
  was 
  written 
  by 
  its 
  author, 
  such 
  changes 
  have 
  

   been 
  made 
  in 
  this 
  issue 
  as 
  are 
  necessary 
  to 
  bring 
  it 
  down 
  to 
  

   date." 
  h. 
  s. 
  u. 
  

  

  II. 
  Geology. 
  

  

  1. 
  Notes 
  on 
  the 
  Geology 
  of 
  the 
  Glass 
  Mountains; 
  by 
  J. 
  A. 
  

   Udden. 
  Geologic 
  Exploration 
  of 
  the 
  Southeastern 
  Front 
  Range 
  

   of 
  Trans-Pecos, 
  Texas; 
  by 
  C. 
  L. 
  Baker 
  and 
  W. 
  F. 
  Bowman. 
  

   University 
  of 
  Texas 
  Bulletin 
  1753, 
  1917. 
  Pp. 
  177, 
  12 
  pis., 
  1 
  

   map. 
  — 
  The 
  southeastern 
  Front 
  Range 
  of 
  Trans-Pecos, 
  Texas, 
  

   recently 
  explored 
  and 
  mapped 
  by 
  Baker 
  and 
  Bowman, 
  is 
  a 
  region 
  

   of 
  exceptional 
  interest. 
  It 
  includes 
  the 
  greatest-known 
  develop- 
  

   ment 
  of 
  Permo-Carboniferous 
  strata, 
  and 
  "every 
  mode 
  of 
  moun- 
  

   tain 
  making 
  is 
  there 
  represented." 
  The 
  mountain-making 
  

   movements 
  of 
  the 
  Western 
  Cordillera 
  are 
  superposed 
  upon 
  Pale- 
  

   ozoic 
  folds 
  of 
  the 
  age 
  and 
  character 
  of 
  the 
  Appalachians. 
  Depo- 
  

   sition 
  in 
  Upper 
  Cambrian 
  time 
  was 
  followed 
  by 
  emergence 
  

   and 
  erosion 
  and 
  the 
  deposition 
  of 
  Ordovician 
  sediments, 
  which 
  

   are 
  unconformably 
  overlain 
  by 
  Devonian 
  ( 
  ?) 
  cherts 
  or 
  novaculite. 
  

   An 
  erosion 
  surface 
  separates 
  these 
  cherts 
  from 
  middle 
  Pennsyl- 
  

   vania 
  beds, 
  which 
  before 
  the 
  close 
  of 
  Upper 
  Pennsylvanian 
  time 
  

   were 
  folded 
  into 
  a 
  mountain 
  range. 
  After 
  a 
  long 
  period 
  of 
  

   erosion 
  this 
  range 
  was 
  submerged 
  and 
  over 
  it 
  deposited 
  the 
  great 
  

   thicknesses 
  of 
  Permo-Carboniferous 
  beds. 
  Re-emergence 
  was 
  

   accompanied 
  by 
  gentle 
  folding 
  and 
  followed 
  by 
  subaerial 
  erosion 
  

   during 
  the 
  Triassic 
  and 
  Jurassic 
  periods. 
  Later 
  events 
  were 
  : 
  

   the 
  advance 
  of 
  the 
  Comanchean 
  sea, 
  Eocene 
  vulcanism, 
  Tertiary 
  

   erosion, 
  and 
  formation 
  of 
  the 
  present 
  mountain 
  ranges 
  near 
  the 
  

   close 
  of 
  Tertiary 
  time. 
  

  

  Glass 
  Mountains 
  described 
  by 
  Udden 
  are 
  a 
  part 
  of 
  the 
  Front 
  

   Range 
  made 
  of 
  9,640 
  feet 
  of 
  folded 
  Permo-Carboniferous 
  sedi- 
  

   ments 
  which 
  "rose 
  for 
  some 
  time 
  above 
  the 
  surrounding 
  country 
  

   in 
  the 
  Comanchean 
  sea." 
  (For 
  a 
  discussion 
  of 
  the 
  important 
  

   paleontologic 
  discoveries 
  at 
  Glass 
  Mountains, 
  see 
  this 
  Journal, 
  

   vol. 
  47, 
  pp. 
  305-307, 
  1919.) 
  H. 
  e. 
  g. 
  

  

  2. 
  Geological 
  Observations 
  in 
  Fiji; 
  by 
  Wilbur 
  Garland 
  

   Foye. 
  Proc. 
  American 
  Academy 
  of 
  Arts 
  and 
  Sciences 
  (Shaler 
  

   Memorial 
  Series), 
  vol. 
  54, 
  no. 
  1, 
  1918. 
  Pp. 
  145, 
  40 
  figs., 
  1 
  map. 
  — 
  

   Six 
  months' 
  study 
  of 
  the 
  geology 
  of 
  Fiji 
  by 
  Professor 
  Foye 
  

   supplements 
  work 
  of 
  Darwin, 
  Dana, 
  Gardiner, 
  Agassiz, 
  Andrews. 
  

   Woolnough, 
  Gnppy, 
  and 
  Davis. 
  The 
  geologic 
  history 
  of 
  the 
  

   group 
  of 
  islands 
  is 
  summarized 
  as 
  follows: 
  "Batholitic 
  intra- 
  

  

  