﻿(jteology. 
  345 
  

  

  organization 
  and 
  explaining 
  the 
  objects 
  of, 
  and 
  the 
  results 
  to 
  be 
  

   derived 
  from, 
  such 
  an 
  official 
  organization. 
  The 
  following 
  are 
  

   among 
  the 
  important 
  objects 
  in 
  view 
  : 
  

  

  The 
  determination 
  of 
  the 
  proper 
  objects 
  of 
  public 
  geological 
  

   work 
  ; 
  the 
  improvement 
  of 
  methods 
  ; 
  the 
  unification 
  of 
  methods 
  ; 
  

   the 
  establishment 
  of 
  the 
  proper 
  relative 
  spheres 
  and 
  functions 
  of 
  

   national 
  and 
  state 
  surveys 
  ; 
  cooperation 
  in 
  works 
  of 
  common 
  in- 
  

   terest 
  and 
  the 
  prevention 
  of 
  duplication 
  of 
  work 
  ; 
  the 
  inaugura- 
  

   tion 
  of 
  surveys 
  by 
  states 
  not 
  having 
  such 
  at 
  present 
  to 
  cooperate 
  

   with 
  the 
  other 
  state 
  surveys 
  and 
  with 
  the 
  national 
  survey. 
  

  

  A 
  committee 
  of 
  six 
  was 
  elected 
  to 
  consider 
  the 
  matter 
  of 
  

   organization, 
  with 
  the 
  power 
  to 
  frame 
  a 
  constitution 
  and 
  by-laws, 
  

   to 
  be 
  reported 
  to 
  the 
  association 
  at 
  a 
  time 
  and 
  place 
  to 
  be 
  selected 
  

   by 
  the 
  committee. 
  This 
  committee 
  consists 
  of 
  Maj. 
  J. 
  W. 
  Powell, 
  

   chairman, 
  and 
  Prof. 
  E. 
  A. 
  Smith, 
  Prof. 
  J. 
  A. 
  Holmes, 
  Dr. 
  J. 
  C. 
  

   Branner, 
  Mr. 
  Arthur 
  Winslow, 
  and 
  Prof. 
  N. 
  H. 
  Winchell. 
  At 
  the 
  

   meeting 
  of 
  the 
  Committee, 
  Saturday 
  evening, 
  Aug. 
  29, 
  the 
  secre- 
  

   tary, 
  Mr. 
  Arthur 
  Winslow, 
  was 
  instructed 
  to 
  draft 
  a 
  constitution 
  

   and 
  by-laws 
  to 
  be 
  submitted 
  to 
  the 
  committee 
  at 
  a 
  meeting 
  to 
  be 
  

   called 
  in 
  connection 
  with 
  the 
  annual 
  meeting 
  of 
  the 
  Geological 
  

   Society 
  in 
  December 
  next. 
  The 
  object 
  of 
  the 
  association 
  is 
  an 
  

   important 
  one 
  and 
  much 
  good 
  should 
  come 
  from 
  it. 
  

  

  4. 
  The 
  Fauna 
  of 
  the 
  Lower 
  Cambrian 
  or 
  Olenellus 
  Zone; 
  by 
  

   C. 
  D. 
  Walcott. 
  pp. 
  51 
  1 
  to 
  774, 
  with 
  plates 
  xliv 
  to 
  xcviii 
  of 
  the 
  

   Tenth 
  Annual 
  Report 
  of 
  the 
  Director 
  of 
  the 
  U. 
  S. 
  Geol. 
  Survey. 
  

   — 
  Mr. 
  Walcott, 
  who 
  has 
  added 
  greatly 
  by 
  his 
  labors 
  to 
  the 
  

   knowledge 
  of 
  Cambrian 
  life 
  and 
  geography, 
  gives 
  a 
  review 
  in 
  

   this 
  memoir 
  of 
  his 
  former 
  work 
  on 
  the 
  fauna 
  of 
  the 
  Lower 
  

   Cambrian, 
  with 
  additions 
  from 
  his 
  more 
  recent 
  results. 
  After 
  a 
  

   chapter 
  on 
  the 
  history 
  of 
  Cambrian 
  discovery, 
  the 
  stratigraphy 
  

   of 
  the 
  Cambrian 
  is 
  reviewed 
  and 
  its 
  distribution 
  over 
  the 
  Ameri- 
  

   can 
  continent 
  and 
  elsewhere, 
  as 
  at 
  present 
  known, 
  is 
  described. 
  

   The 
  latter 
  subject 
  is 
  illustrated 
  as 
  regards 
  America 
  by 
  a 
  map 
  on 
  

   which 
  sections 
  are 
  drawn 
  for 
  each 
  locality 
  having 
  their 
  relative 
  

   heights 
  ; 
  and 
  the 
  former 
  by 
  various 
  actual 
  sections, 
  some 
  of 
  

   which 
  show 
  contacts 
  with 
  older 
  rocks. 
  Mr. 
  Walcott 
  observes 
  

   that 
  the 
  fauna 
  lived, 
  not 
  on 
  the 
  outer 
  coasts 
  of 
  America 
  but 
  in 
  

   interior 
  straits 
  or 
  channels 
  between 
  emerged 
  ranges 
  of 
  older 
  

   rocks 
  ; 
  that 
  it 
  occupied 
  the 
  eastern 
  and 
  western 
  portions 
  of 
  the 
  

   continent, 
  but 
  that 
  " 
  as 
  far 
  as 
  known, 
  the 
  Lower 
  Cambrian 
  is 
  

   absent 
  from 
  the 
  interior 
  of 
  the 
  continent," 
  indicating 
  thereby, 
  

   he 
  says, 
  very 
  uniform 
  condition 
  over 
  the 
  central 
  portions. 
  He 
  

   remarks 
  that 
  the 
  Upper 
  Cambrian 
  sea 
  is 
  shown 
  to 
  have 
  been 
  

   transcontinental 
  by 
  the 
  presence 
  of 
  identical 
  species 
  of 
  fossils 
  in 
  

   Northern 
  New 
  York, 
  Lake 
  Champlain 
  valley, 
  St. 
  Lawrence 
  

   valley, 
  Tennessee, 
  Alabama, 
  Wisconsin, 
  Minnesota, 
  Texas, 
  the 
  

   Black 
  Hills 
  of 
  Dakota, 
  Nevada 
  and 
  Montana. 
  In 
  the 
  Olenellus 
  

   period, 
  also, 
  there 
  was 
  a 
  similar 
  assemblage 
  of 
  forms 
  on 
  the 
  

   opposite 
  sides 
  of 
  the 
  Continent. 
  

  

  The 
  chapter 
  on 
  the 
  Geographical 
  distribution 
  goes 
  into 
  details 
  

   as 
  to 
  the 
  rocks 
  and 
  species 
  of 
  each 
  locality 
  over 
  the 
  Continent, 
  

  

  