﻿FOURTH 
  REPORT 
  OF 
  THE 
  DIRECTOR 
  I907 
  73 
  

  

  margin 
  of 
  the 
  region, 
  but 
  like 
  that 
  was 
  greatest 
  on 
  the 
  northeast. 
  

   During 
  the 
  Beekmantown 
  occurred 
  an 
  uplift 
  which 
  caused 
  cessation 
  

   of 
  deposition 
  in 
  all 
  the 
  region 
  except 
  the 
  eastern 
  border, 
  confining 
  

   the 
  later 
  Beekmantown 
  and 
  the 
  Chazy 
  deposits 
  to 
  that 
  district. 
  

   Oscillation 
  then 
  occurred 
  between 
  the 
  Beekmantown 
  and 
  the 
  Chazy, 
  

   pinching 
  out 
  the 
  Chazy 
  to 
  the 
  south. 
  Depression 
  then 
  ensued 
  on 
  

   the 
  south 
  and 
  west, 
  and 
  the 
  Lowville 
  beds 
  were 
  deposited. 
  The 
  

   Black 
  River 
  limestone 
  followed, 
  this 
  being 
  the 
  first 
  formation 
  found 
  

   on 
  all 
  three 
  sides 
  of 
  the 
  region, 
  which 
  indicates 
  connecting 
  waters 
  

   and 
  similar 
  conditions 
  on 
  these 
  sides. 
  

  

  In 
  the 
  following 
  Trenton 
  time 
  it 
  seems 
  likely 
  that 
  the 
  waters 
  

   nearly 
  overspread 
  the 
  entire 
  present 
  Adirondack 
  region, 
  though 
  

   shore-line 
  conditions 
  and 
  small 
  subsidence 
  are 
  characteristic 
  of 
  the 
  

   Mohawk 
  valley 
  region. 
  

  

  Utica 
  shale 
  conditions 
  came 
  in 
  from 
  the 
  east, 
  and 
  gradually 
  en- 
  

   croached 
  westward 
  on 
  the 
  Trenton, 
  so 
  that 
  the 
  one 
  thickens 
  as 
  the 
  

   other 
  thins, 
  the 
  Trenton 
  thickest 
  on 
  the 
  west, 
  the 
  Utica 
  on 
  the 
  east. 
  

   Following 
  the 
  Utica 
  came 
  the 
  uplift 
  which 
  brought 
  most 
  of 
  the 
  

   region 
  above 
  sea 
  level. 
  

  

  On 
  Wednesday, 
  July 
  10, 
  the 
  party 
  regretfully 
  bade 
  goodbye 
  to 
  

   the 
  hospitable 
  authorities 
  of 
  the 
  Catholic 
  Summer 
  School, 
  and 
  took 
  

   the 
  delightful 
  sail 
  down 
  Lake 
  Champlain. 
  

  

  At 
  Baldwins, 
  the 
  steamboat 
  terminal 
  at 
  the 
  northern 
  end 
  of 
  Lake 
  

   George, 
  the 
  party 
  were 
  met 
  by 
  Prof. 
  J. 
  F. 
  Kemp, 
  by 
  whom 
  they 
  

   were 
  guided 
  in 
  the 
  Lake 
  George 
  valley. 
  The 
  first 
  stop 
  was 
  Hague, 
  

   where 
  the 
  graphite 
  bed 
  at 
  the 
  Lakeside 
  mine 
  was 
  studied. 
  The 
  

   bed 
  is 
  10 
  feet 
  thick, 
  and 
  consists 
  of 
  a 
  graphite 
  schist 
  in 
  which 
  

   graphite 
  supplies 
  the 
  micaceous 
  mineral. 
  Feldspar, 
  quartz 
  and 
  a 
  

   little 
  pyrite 
  constitute 
  the 
  associated 
  minerals. 
  In 
  physical 
  aspect 
  

   the 
  beds 
  appear 
  but 
  slightly 
  changed 
  from 
  a 
  shaly 
  sandstone. 
  The 
  

   floor 
  and 
  roof 
  rocks 
  are 
  a 
  garnet-feldspar 
  gneiss 
  with 
  much 
  silli- 
  

   manite. 
  The 
  pegmatitic 
  phases 
  are 
  frequent. 
  The 
  several 
  methods 
  

   of 
  origin, 
  organic 
  ; 
  hydrocarbons 
  akin 
  to 
  petroleum 
  ; 
  the 
  influence 
  

   of 
  eruptive 
  rocks, 
  etc., 
  were 
  passed 
  in 
  review. 
  The 
  forms 
  of 
  

   occurrence 
  of 
  graphite 
  in 
  the 
  Adirondack^, 
  in 
  crystalline 
  limestones, 
  

   pegmatite 
  veins, 
  and 
  schists 
  or 
  quartzites 
  were 
  set 
  forth. 
  The 
  in- 
  

   variable 
  association 
  even 
  of 
  the 
  graphite-bearing 
  pegmatites 
  with 
  

   Grenville 
  sediments 
  was 
  emphasized, 
  and 
  the 
  schists 
  seemed 
  most 
  

   probably 
  a 
  metamorphosed 
  carbonaceous 
  sediment, 
  or 
  one 
  which 
  had 
  

   been 
  impregnated 
  with 
  a 
  heavy 
  oil. 
  

  

  