﻿FOURTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I907 
  3 
  1 
  

  

  trine 
  silts 
  and 
  sands 
  of 
  the 
  Mohawk 
  valley, 
  the 
  gravels 
  and 
  sands 
  

   of 
  the 
  Lake 
  Albany 
  and 
  Iroquois 
  stage, 
  and 
  the 
  lacustrine 
  clays 
  of 
  

   Lake 
  Schenectady. 
  Postglacial 
  modifications 
  of 
  the 
  glacial 
  deposits 
  

   are 
  conspicuous 
  along 
  the 
  valleys 
  of 
  the 
  Mohawk 
  and 
  the 
  Schoharie. 
  

   Curiously 
  along 
  the 
  Mohawk 
  there 
  is 
  nothing 
  that 
  can 
  be 
  called 
  

   ordinarily 
  alluvial 
  terrace. 
  Meanders 
  are 
  practically 
  absent 
  while 
  

   along 
  the 
  Schoharie 
  terraces 
  meanders 
  and 
  abundant 
  oxbow 
  chan- 
  

   nels 
  are 
  typical 
  and 
  conspicuous. 
  These 
  differences 
  point 
  to 
  radical 
  

   differences 
  in 
  the 
  history 
  of 
  the 
  major 
  valley 
  as 
  compared 
  with 
  

   that 
  of 
  its 
  tributary, 
  and 
  these 
  differences 
  have 
  to 
  do, 
  it 
  would 
  

   seem, 
  with 
  the 
  marked 
  lacustrine 
  conditions 
  and 
  great 
  lake 
  outflow 
  

   that 
  belonged 
  to 
  the 
  Mohawk 
  valley. 
  As 
  already 
  intimated 
  the 
  

   conclusions 
  here 
  announced 
  by 
  Professor 
  Brigham 
  and 
  the 
  hypothe- 
  

   sis 
  suggested 
  need 
  explanation 
  and 
  confirmation 
  by 
  close 
  study 
  

   of 
  surrounding 
  areas. 
  It 
  is 
  desirable 
  to 
  know 
  the 
  westward 
  and 
  

   southern 
  limits 
  of 
  the 
  Mohawk 
  lobe. 
  From 
  the 
  general 
  appear- 
  

   ance 
  of 
  the 
  topography 
  it 
  would 
  seem 
  that 
  the 
  powerful 
  glaciation 
  

   of 
  the 
  Mohawk 
  region 
  must 
  have 
  ceased 
  not 
  far 
  south 
  of 
  the 
  

   boundary 
  of 
  the 
  present 
  area. 
  The 
  map 
  of 
  the 
  Berne 
  quadrangle 
  

   south 
  of 
  the 
  Amsterdam 
  quadrangle 
  seems 
  to 
  show 
  interesting 
  con- 
  

   ditions 
  which 
  it 
  has 
  not 
  been 
  possible 
  to 
  study 
  in 
  the 
  field. 
  Near 
  

   the 
  middle 
  of 
  the 
  quadrangle 
  there 
  is 
  a 
  conspicuous 
  bifurcation 
  in 
  

   the 
  trends 
  of 
  the 
  drumlinoid 
  or 
  linear 
  forms 
  of 
  topography, 
  indi- 
  

   cating 
  apparently 
  a 
  push 
  to 
  the 
  west 
  as 
  a 
  part 
  of 
  the 
  flow 
  of 
  the 
  

   Mohawk 
  glacier 
  already 
  described, 
  and 
  a 
  push 
  to 
  the 
  south 
  along 
  

   the 
  lines 
  of 
  the 
  Hudson 
  valley. 
  It 
  is 
  conjectured 
  that 
  a 
  study 
  of 
  

   this 
  area 
  in 
  the 
  field 
  will 
  show 
  corresponding 
  directions 
  of 
  the 
  

   glacial 
  striae 
  and 
  that 
  here 
  may 
  perhaps 
  be 
  found 
  a 
  point 
  of 
  con- 
  

   spicuous 
  divergence 
  between 
  the 
  Mohawk 
  and 
  Hudson 
  river 
  lobes 
  

   of 
  the 
  glacier 
  at 
  a 
  certain 
  stage 
  of 
  their 
  activity. 
  

  

  Industrial 
  geology 
  

  

  Mines 
  and 
  quarries. 
  The 
  third 
  of 
  the 
  series 
  of 
  annual 
  bulletins 
  

   reviewing 
  the 
  progress 
  of 
  the 
  mineral 
  industries 
  in 
  the 
  State 
  was 
  

   published 
  in 
  July 
  of 
  the 
  current 
  year. 
  There 
  is 
  a 
  steady 
  demand 
  

   for 
  information 
  relating 
  to 
  the 
  mineral 
  resources, 
  such 
  as 
  is 
  given 
  

   in 
  these 
  publications, 
  and 
  the 
  continuance 
  of 
  their 
  issue 
  seems 
  ad- 
  

   visable. 
  

  

  The 
  statistics 
  collected 
  for 
  publication 
  in 
  the 
  report 
  indicate 
  a 
  

   material 
  growth 
  in 
  the 
  importance 
  of 
  the 
  mining 
  and 
  quarry 
  in- 
  

   dustries 
  during 
  recent 
  years. 
  The 
  total 
  output 
  of 
  all 
  materials 
  re- 
  

  

  