﻿Geology 
  and 
  Mineralogy. 
  249 
  

  

  the 
  work. 
  Five 
  pages 
  of 
  text 
  written 
  by 
  Mr. 
  Hague 
  accompany 
  

   the 
  maps, 
  giving 
  a 
  clear 
  and 
  admirable 
  resume 
  of 
  the 
  geological 
  

   history 
  of 
  the 
  Park 
  ; 
  there 
  is 
  an 
  additional 
  page 
  by 
  Mr. 
  Iddings 
  

   on 
  the 
  igneous 
  rocks 
  which 
  play 
  so 
  important 
  a 
  role 
  in 
  the 
  geol- 
  

   ogy 
  of 
  the 
  district. 
  There 
  are 
  also 
  three 
  pages 
  devoted 
  to 
  the 
  

   reproduction 
  of 
  photographs 
  of 
  a 
  striking 
  character 
  illustrating 
  

   different 
  objects 
  of 
  geological 
  interest. 
  

  

  The 
  economic 
  maps 
  of 
  the 
  general 
  atlas 
  sheets 
  are 
  of 
  course 
  

   wanting. 
  The 
  work 
  is 
  a 
  superb 
  example 
  of 
  the 
  engraver's 
  and 
  

   printer's 
  art. 
  

  

  Now 
  that 
  this 
  interesting 
  work 
  has 
  been 
  issued, 
  the 
  advent 
  of 
  

   the 
  special 
  report 
  on 
  the 
  geology 
  of 
  the 
  district 
  will 
  be 
  eagerly 
  

   looked 
  for 
  and 
  we 
  trust 
  that 
  it 
  may 
  not 
  be 
  long 
  delayed. 
  

  

  l. 
  v. 
  p. 
  

  

  3. 
  Report 
  of 
  the 
  Director 
  of 
  the 
  United 
  States 
  Geological 
  Sur- 
  

   vey 
  for 
  the 
  year 
  1895-96 
  ; 
  by 
  Charles 
  D. 
  Walcott, 
  Director. 
  

   (Extract 
  from 
  17th 
  Ann. 
  Rept. 
  IT. 
  S. 
  G. 
  S., 
  Part 
  I), 
  pp. 
  1-200. 
  

   1896. 
  — 
  In 
  addition 
  to 
  the 
  usual 
  report 
  of 
  the 
  detailed 
  work 
  of 
  the 
  

   Survey 
  the 
  director 
  calls 
  attention 
  to 
  the 
  law 
  passed 
  by 
  Congress, 
  

   June 
  11, 
  1S96, 
  providing 
  for 
  the 
  monumenting 
  of 
  the 
  topographic 
  

   surveys. 
  The 
  provision 
  is 
  embodied 
  in 
  the 
  following 
  clause 
  in 
  the 
  

   sundry 
  civil 
  appropriation 
  act 
  of 
  above 
  date: 
  

  

  " 
  Provided, 
  That 
  hereafter 
  in 
  such 
  surveys 
  west 
  of 
  the 
  ninety- 
  

   fifth 
  meridian 
  elevations 
  above 
  a 
  base 
  level 
  located 
  in 
  each 
  area 
  

   under 
  survey 
  shall 
  be 
  determined 
  and 
  marked 
  on 
  the 
  ground 
  by 
  

   iron 
  or 
  stone 
  posts 
  or 
  permanent 
  bench 
  marks, 
  at 
  least 
  two 
  such 
  

   posts 
  or 
  bench 
  marks 
  to 
  be 
  established 
  in 
  each 
  township 
  or 
  equiva- 
  

   lent 
  area, 
  except 
  in 
  the 
  forest-clad 
  and 
  mountain 
  areas, 
  where 
  at 
  

   least 
  one 
  shall 
  be 
  established, 
  and 
  these 
  shall 
  be 
  placed, 
  whenever 
  

   practicable, 
  near 
  the 
  township 
  corners 
  of 
  the 
  public-land 
  surveys 
  ; 
  

   and 
  in 
  the 
  areas 
  east 
  of 
  the 
  ninety-fifth 
  meridian 
  at 
  least 
  one 
  such 
  

   post 
  or 
  bench 
  mark 
  shall 
  be 
  similarly 
  established 
  in 
  each 
  area 
  

   equivalent 
  tathe 
  area 
  of 
  a 
  township 
  of 
  the 
  public-land 
  surveys." 
  

  

  This 
  provision, 
  passed 
  at 
  the 
  instigation 
  of 
  the 
  Director; 
  will 
  

   greatly 
  increase 
  the 
  value 
  of 
  the 
  geologic 
  survey 
  work, 
  both 
  to 
  

   geologists 
  and 
  to 
  inhabitants 
  of 
  the 
  territory 
  surveyed. 
  

  

  The 
  -geologic 
  work 
  was 
  carried 
  on 
  by 
  twenty-eight 
  field 
  parties, 
  

   the 
  paleontologic 
  work 
  by 
  six 
  field 
  parties. 
  In 
  the 
  division 
  of 
  

   hydrography, 
  field 
  operations, 
  under 
  the 
  general 
  charge 
  of 
  Fred. 
  

   H. 
  Newell, 
  were 
  carried 
  on 
  in 
  various 
  regions 
  of 
  the 
  United 
  

   States, 
  classified 
  as 
  humid, 
  sub-humid 
  and 
  arid. 
  A 
  large 
  list 
  of 
  

   rivers 
  were 
  systematically 
  measured, 
  classified 
  under 
  sixteen 
  

   great 
  river 
  basins. 
  The 
  topographic 
  branch 
  of 
  the 
  survey 
  during 
  

   the 
  year 
  was 
  reorganized, 
  the 
  classification 
  into 
  four 
  sections 
  

   being 
  retained 
  in 
  charge 
  of 
  the 
  same 
  chiefs 
  as 
  heretofore, 
  but 
  the 
  

   director 
  assumed 
  the 
  immediate 
  charge 
  of 
  the 
  whole. 
  There 
  

   were 
  forty 
  topographic 
  parties 
  working 
  in 
  twenty-five 
  different 
  

   states 
  and 
  territories 
  connected 
  with 
  this 
  important 
  branch 
  of 
  the 
  

   survey, 
  and 
  48,066 
  square 
  miles 
  were 
  surveyed 
  during 
  the 
  year. 
  

  

  In 
  the 
  editorial 
  division 
  12,875 
  manuscript 
  pages 
  and 
  4627 
  

  

  