﻿156 
  Scientific 
  Intelligence. 
  

  

  the 
  age 
  is 
  somewhat 
  uncertain, 
  but 
  the 
  evidence 
  seems 
  to 
  point 
  

   to 
  probable 
  Eocene 
  rather 
  than 
  Miocene 
  age. 
  h. 
  s. 
  w 
  

  

  3. 
  The 
  underground 
  water 
  of 
  the 
  Arkansas 
  Valley 
  in 
  Eastern 
  

   Colorado 
  ; 
  by 
  G. 
  K. 
  Gilbert. 
  (From 
  the 
  Seventeenth 
  Annual 
  

   Report 
  of 
  the 
  U. 
  S. 
  Geol. 
  Survey. 
  Part 
  II.) 
  — 
  This 
  is 
  an 
  excel- 
  

   lent 
  piece 
  of 
  descriptive 
  geology, 
  adapted 
  to 
  the 
  needs 
  of 
  those 
  

   who 
  will 
  reap 
  most 
  benefit 
  from 
  it, 
  i.e., 
  the 
  people 
  living 
  in 
  the 
  

   region 
  described. 
  

  

  The 
  author 
  has 
  used 
  fossils 
  as 
  true 
  " 
  Leitfossilien 
  ," 
  marks 
  ot 
  

   the 
  various 
  formations 
  in 
  which 
  they 
  occur 
  ; 
  and 
  among 
  them 
  he 
  

   has 
  included 
  a 
  beautiful 
  plate 
  of 
  u 
  nodules 
  of 
  marcasite," 
  charac- 
  

   teristic 
  of 
  the 
  lower 
  part 
  of 
  the 
  Timpas 
  limestone. 
  The 
  ordinary 
  

   well 
  driller 
  should 
  be 
  able, 
  with 
  the 
  use 
  of 
  this 
  essay, 
  to 
  locate 
  

   any 
  one 
  of 
  the 
  formations 
  passed 
  through. 
  The 
  Dakota 
  sand- 
  

   stone 
  is 
  said 
  to 
  be 
  the 
  only 
  valuable 
  source 
  for 
  artesian 
  water 
  in 
  

   the 
  region 
  discussed, 
  and 
  much 
  care 
  is 
  taken 
  to 
  demonstrate 
  the 
  

   depth 
  undergound 
  and 
  slope 
  of 
  this 
  sandstone, 
  by 
  the 
  aid 
  of 
  

   diagrammatic 
  sections 
  across 
  the 
  region 
  in 
  various 
  directions, 
  and 
  

   by 
  clear 
  definitions, 
  in 
  simple 
  but 
  thoroughly 
  scientific 
  language. 
  

  

  h. 
  s. 
  w. 
  

  

  4. 
  The 
  Geological 
  Society 
  of 
  America. 
  — 
  The 
  ninth 
  annual 
  

   meeting 
  of 
  the 
  Geological 
  Society 
  was 
  held 
  in 
  Washington, 
  D. 
  

   C, 
  December 
  29th, 
  30th 
  and 
  31st. 
  The 
  following 
  officers 
  were 
  

   elected 
  lor 
  the 
  ensuing 
  year: 
  — 
  President, 
  Edward 
  Orton, 
  Colum- 
  

   bus, 
  O. 
  ; 
  1st 
  Vice-President, 
  J. 
  J. 
  Stevenson, 
  New 
  York 
  City; 
  

   2d 
  Vice-President, 
  B. 
  K. 
  Emerson, 
  Amherst, 
  Mass. 
  ; 
  Secretary, 
  

   H. 
  L. 
  Fairchild, 
  Rochester, 
  N. 
  Y. 
  ; 
  Treasurer, 
  I. 
  C. 
  White, 
  Mor- 
  

   gantown, 
  W. 
  Va. 
  ; 
  Editor, 
  J. 
  Stanley-Brown, 
  Washington, 
  D. 
  

   C. 
  ; 
  Councillors, 
  J. 
  S. 
  Diller, 
  Washington, 
  D. 
  C, 
  W. 
  B. 
  Scott, 
  

   Princeton, 
  N. 
  Y. 
  The 
  sessions 
  were 
  held 
  in 
  the 
  Hall 
  of 
  the 
  

   National 
  Museum 
  and 
  were 
  presided 
  over 
  by 
  the 
  President, 
  

   Joseph 
  Le 
  Conte, 
  Berkeley, 
  Cal. 
  Memorials 
  of 
  deceased 
  fellows 
  

   were 
  read 
  as 
  follows 
  : 
  — 
  of 
  Robert 
  Hay, 
  by 
  R. 
  T. 
  Hill 
  : 
  of 
  Charles 
  

   Wachsmuth, 
  by 
  Samuel 
  Calvin 
  ; 
  of 
  N. 
  J. 
  Giroux, 
  by 
  R. 
  W. 
  Ells. 
  

  

  The 
  following 
  is 
  a 
  list 
  of 
  the 
  papers 
  presented 
  lor 
  reading: 
  

  

  Joseph 
  Le 
  Conte: 
  The 
  different 
  kinds 
  of 
  earth-crust 
  movements 
  and 
  their 
  

   causes. 
  (President's 
  address.) 
  

  

  J. 
  S. 
  Diller: 
  Crater 
  Jake. 
  

  

  J. 
  F. 
  Kemp: 
  The 
  Leucite 
  hills, 
  Wyoming. 
  

  

  N. 
  H. 
  Darton: 
  Physiographic 
  development 
  of 
  the 
  District 
  of 
  Columbia 
  

   region. 
  

  

  N. 
  H. 
  Darton: 
  Dikes 
  in 
  Appalachian 
  Yirginia. 
  

  

  Frank 
  Leverett: 
  On 
  the 
  changes 
  of 
  drainage 
  in 
  the 
  Ohio 
  river 
  basin. 
  

  

  C. 
  William 
  Hayes: 
  The 
  solution 
  of 
  quartz 
  under 
  atmospheric 
  conditions. 
  

  

  Marius 
  H. 
  Campblll: 
  Erosion 
  at 
  base 
  level. 
  

  

  Marius 
  R. 
  Campbell: 
  The 
  origin 
  of 
  certain 
  topographic 
  forms. 
  

  

  J. 
  B. 
  Woodworth: 
  Homology 
  of 
  joints 
  and 
  artificial 
  fractures. 
  

  

  Arthur 
  Keith 
  : 
  Notes 
  on 
  the 
  structure 
  of 
  the 
  Cranberry 
  district 
  in 
  North 
  

   Carolina 
  

  

  C. 
  H. 
  Hitchcock: 
  Notes 
  on 
  the 
  stratigraphy 
  of 
  certain 
  homogeneous 
  rocks. 
  

  

  J. 
  B 
  Woodworth 
  : 
  Unconformities 
  in 
  Martha's 
  Vineyard 
  and 
  Block 
  Island. 
  

  

  Robert 
  Bell: 
  Evidences 
  of 
  northeasterly 
  differential 
  rising 
  of 
  the 
  land 
  along 
  

   Bell 
  river. 
  (Read 
  by 
  title.) 
  

  

  

  