﻿78 
  Scientific 
  Intelligence. 
  

  

  The 
  latter 
  comparison 
  might 
  then 
  bring 
  into 
  close 
  association 
  the 
  

   chronogenetic 
  evidence 
  to 
  be 
  derived 
  from 
  our 
  earliest 
  Eocene 
  

   mammal 
  faunas. 
  chakles 
  schuchert. 
  

  

  2. 
  Geology 
  of 
  Missouri; 
  by 
  E. 
  B. 
  Branson. 
  Univ. 
  of 
  Mis- 
  

   souri 
  Bulletin, 
  vol. 
  19, 
  No. 
  15, 
  172 
  pp., 
  5 
  pis., 
  59 
  text 
  figs., 
  1918. 
  

   — 
  This 
  good 
  and 
  up-to-date 
  report 
  is 
  written 
  for 
  the 
  educated 
  

   man, 
  for 
  those 
  in 
  search 
  of 
  useful 
  natural 
  resources, 
  and 
  for 
  

   geologists 
  who 
  want 
  quickly 
  to 
  get 
  at 
  the 
  broader 
  and 
  more 
  

   general 
  stratigraphy 
  of 
  the 
  state. 
  There 
  are 
  also 
  many 
  little 
  

   maps 
  in 
  the 
  report 
  giving 
  the 
  outcrops 
  of 
  the 
  thicker 
  formations 
  

   in 
  generalized 
  form, 
  along 
  with 
  the 
  paleogeography 
  for 
  the 
  state 
  

   at 
  the 
  time 
  of 
  the 
  deposit 
  illustrated. 
  As 
  the 
  type 
  is 
  small, 
  there 
  

   is 
  a 
  great 
  deal 
  more 
  information 
  in 
  the 
  report 
  than 
  the 
  number 
  

   of 
  pages 
  indicates. 
  

  

  In 
  reading 
  the 
  work 
  one 
  soon 
  comes 
  to 
  realize 
  how 
  different 
  

   the 
  stratigraphic 
  interpretation 
  of 
  to-day 
  is 
  compared 
  with 
  that 
  

   of 
  twenty 
  years 
  ago. 
  Then 
  there 
  were 
  universal 
  seas, 
  slowly 
  

   retreating 
  from 
  the 
  North 
  American 
  continent 
  : 
  now 
  the 
  forma- 
  

   tions 
  are 
  seen 
  to 
  be 
  local, 
  the 
  sequence 
  much 
  broken 
  and 
  the 
  seas 
  

   periodic 
  in 
  their 
  advance 
  over 
  and 
  retreat 
  from 
  the 
  continent. 
  

   Under 
  these 
  circumstances 
  the 
  ancient 
  geography 
  looms 
  larger, 
  

   and 
  efforts 
  are 
  being 
  made 
  by 
  many 
  to 
  visualize 
  this 
  paleogeog- 
  

   raphy. 
  This 
  Missouri 
  report 
  is 
  one 
  that 
  should 
  be 
  in 
  the 
  hands 
  

   of 
  all 
  working 
  and 
  teaching 
  geologists. 
  c. 
  s. 
  

  

  3. 
  Early 
  Mesozoic 
  physiography 
  of 
  the 
  southern 
  Rocky 
  Moun- 
  

   tains; 
  by 
  Willis 
  T. 
  Lee. 
  Smithson. 
  Misc. 
  Coll., 
  vol. 
  69, 
  No. 
  4, 
  

   41 
  pp., 
  4 
  pis., 
  1918. 
  — 
  The 
  principle 
  of 
  paleophysiography 
  is 
  here 
  

   used 
  in 
  connection 
  with 
  that 
  of 
  diastrophism 
  in 
  determining 
  the 
  

   chronogenesis 
  of 
  Triassic 
  and 
  Jurassic 
  time 
  in 
  the 
  Rocky 
  Moun- 
  

   tain 
  area. 
  To 
  determine 
  the 
  physiography 
  of 
  Triassic 
  time, 
  the 
  

   author 
  takes 
  up 
  a 
  rapid 
  study 
  of 
  Pennsylvania-Permian 
  time 
  

   and 
  finds 
  that 
  there 
  was 
  an 
  "ancestral 
  Rocky 
  Mountains" 
  in 
  

   the 
  southern 
  part 
  of 
  the 
  United 
  States. 
  In 
  late 
  Triassic 
  times 
  

   other 
  mountains 
  were 
  raised 
  along 
  the 
  Pacific 
  coast 
  and 
  a 
  shal- 
  

   low 
  basin 
  like 
  that 
  of 
  the 
  present 
  Mississippi 
  valley 
  was 
  formed 
  

   to 
  the 
  east 
  of 
  them. 
  Some 
  of 
  the 
  debris 
  of 
  these 
  western 
  moun- 
  

   tains 
  was 
  laid 
  down 
  in 
  the 
  shallow 
  valley 
  as 
  desert 
  sands 
  in 
  

   Arizona, 
  Utah, 
  and 
  western 
  Colorado. 
  Finally, 
  early 
  in 
  Jurassic 
  

   time 
  the 
  peneplain 
  that 
  had 
  long 
  been 
  developing 
  — 
  the 
  La 
  Plata 
  

   peneplain 
  — 
  was 
  completed, 
  and 
  later 
  invaded, 
  first 
  in 
  the 
  south 
  

   by 
  the 
  La 
  Plata 
  desert 
  sands 
  and 
  from 
  the 
  northwest 
  by 
  the 
  

   Jurassic 
  sea. 
  On 
  these 
  grounds, 
  the 
  author 
  is 
  disposed 
  to 
  regard 
  

   the 
  marine 
  deposits 
  as 
  of 
  very 
  late 
  Jurassic 
  age, 
  recognizing, 
  

   however, 
  that 
  the 
  ammonites 
  are 
  not 
  in 
  harmony 
  with 
  his 
  views. 
  

  

  The 
  paper 
  is 
  strikingly 
  original, 
  and 
  whether 
  one 
  agrees 
  with 
  

   the 
  author 
  's 
  conclusions 
  in 
  regard 
  to 
  the 
  age 
  of 
  the 
  marine 
  Juras- 
  

   sic 
  deposits 
  ( 
  Sundance) 
  or 
  not, 
  it 
  is 
  a 
  praiseworthy 
  application 
  

   of 
  an 
  old 
  principle 
  in 
  the 
  elucidation 
  of 
  medieval 
  geologic 
  

   history. 
  c. 
  s. 
  

  

  