﻿FOURTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I907 
  I 
  J 
  

  

  the 
  region 
  are 
  comparatively 
  common. 
  Several 
  occurrences 
  in 
  addi- 
  

   tion 
  to 
  those 
  previously 
  enumerated 
  have 
  been 
  mapped. 
  Associated 
  

   with 
  two 
  of 
  these 
  small 
  limestone 
  belts 
  are 
  graphitic 
  schists 
  of 
  

   considerable 
  prominence. 
  These 
  types 
  are 
  believed 
  to 
  lend 
  further 
  

   support 
  to 
  the 
  sedimentary 
  character 
  of 
  certain 
  portions 
  of 
  the 
  

   series. 
  One 
  of 
  the 
  graphitic 
  outcrops 
  has 
  attracted 
  some 
  local 
  

   attention 
  looking 
  toward 
  development. 
  

  

  It 
  is 
  clear, 
  however, 
  that 
  the 
  proportion 
  of 
  the 
  igneous 
  members 
  

   to 
  the 
  sediments 
  in 
  the 
  basal 
  gneiss 
  series 
  varies 
  greatly 
  in 
  different 
  

   areas. 
  In 
  the 
  eastern 
  part 
  of 
  the 
  Carmel 
  quadrangle 
  those 
  inter- 
  

   preted 
  as 
  igneous 
  types 
  greatly 
  predominate. 
  The 
  prevalence 
  of 
  

   schists, 
  limestones 
  and 
  quartzose 
  rocks 
  considered 
  sedimentary, 
  is 
  

   much 
  more 
  marked 
  in 
  the 
  West 
  Point 
  quadrangle 
  and 
  especially 
  

   in 
  the 
  vicinity 
  of 
  the 
  Hudson 
  river. 
  

  

  Surficial 
  geology 
  

  

  The 
  problems 
  relating 
  to 
  the 
  impounding 
  and 
  drainage 
  of 
  surface 
  

   waters 
  upon 
  the 
  retreat 
  of 
  the 
  glacial 
  ice, 
  the 
  making 
  and 
  breaking 
  

   of 
  glacial 
  and 
  postglacial 
  lakes, 
  the 
  molding 
  of 
  the 
  present 
  

   topography 
  of 
  the 
  country 
  to 
  the 
  change 
  in 
  the 
  level 
  of 
  the 
  marine 
  

   waters 
  and 
  their 
  former 
  incursion 
  into 
  what 
  are 
  now 
  fresh-water 
  

   passages, 
  have 
  involved 
  investigation 
  along 
  lines 
  and 
  in 
  areas 
  indi- 
  

   cated 
  in 
  my 
  report 
  of 
  last 
  year, 
  by 
  Prof. 
  J. 
  B. 
  Woodw 
  r 
  orth 
  in 
  the 
  

   northeastern 
  region, 
  Prof. 
  H. 
  L. 
  Fairchild 
  in 
  the 
  central 
  and 
  western 
  

   region 
  and 
  Prof. 
  A. 
  P. 
  Brigham 
  in 
  the 
  Mohawk 
  valley. 
  

  

  For 
  the 
  northeastern 
  region 
  Professor 
  Woodworth 
  has 
  practically 
  

   completed 
  the 
  detailed 
  mapping 
  and 
  report 
  for 
  the 
  Schuylerville 
  

   quadrangle. 
  The 
  report 
  will 
  give 
  an 
  account 
  of 
  the 
  extensive 
  sand 
  

   deposits 
  between 
  Saratoga 
  and 
  Fort 
  Edward 
  which 
  are 
  not 
  without 
  

   economic 
  interest 
  because 
  of 
  the 
  occurrence 
  of 
  molding 
  sands 
  in 
  

   that 
  district. 
  The 
  remarkable 
  rock 
  basins 
  of 
  Round 
  lake 
  and 
  

   Saratoga 
  lake 
  are 
  dealt 
  with, 
  but 
  a 
  final 
  report 
  on 
  these 
  features 
  

   must 
  await 
  the 
  detailed 
  mapping 
  of 
  the 
  topographic 
  sheets 
  in 
  which 
  

   their 
  southern 
  and 
  western 
  portions 
  lie. 
  These 
  lake 
  depressions 
  

   notwithstanding 
  their 
  small 
  size 
  are 
  of 
  singular 
  interest. 
  The 
  report 
  

   will 
  contain 
  a 
  diagnosis 
  of 
  late 
  glacial 
  lake 
  and 
  river 
  changes, 
  adding 
  

   much 
  in 
  details 
  to 
  the 
  preliminary 
  sketch 
  made 
  in 
  the 
  report 
  on 
  

   Ancient 
  Water 
  Levels 
  of 
  the 
  Champlain 
  and 
  Hudson 
  Valleys. 
  

   Similar 
  work 
  on 
  the 
  Rouse 
  Point 
  sheet 
  lying 
  directly 
  east 
  of 
  the 
  

   Mooers 
  sheet 
  already 
  published 
  has 
  progressed 
  and 
  the 
  completion 
  

   of 
  this 
  map 
  will 
  carry 
  the 
  line 
  of 
  marine 
  deposits 
  from 
  the 
  base 
  of 
  

  

  