﻿10 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  elusions 
  representing 
  those, 
  parts 
  last 
  torn 
  away 
  from 
  the 
  cover 
  

   formerly 
  overlying 
  the 
  granite 
  which 
  was 
  then 
  in 
  such 
  viscous 
  con- 
  

   dition 
  that 
  the 
  inclusions 
  have 
  moved 
  but 
  little 
  from 
  their 
  point 
  of 
  

   detachment. 
  Unlike 
  the 
  granite 
  gneiss, 
  this 
  Picton 
  granite 
  was 
  

   well 
  supplied 
  with 
  mineralizing 
  agents 
  and 
  has 
  produced 
  consider- 
  

   able 
  contact 
  effect 
  on 
  the 
  adjacent 
  rocks, 
  notably 
  a 
  striking 
  develop- 
  

   ment 
  of 
  tourmalin. 
  

  

  There 
  is 
  also 
  a 
  considerable 
  development 
  of 
  wide 
  trap 
  dikes 
  on 
  

   Grindstone 
  and 
  Wellesley 
  islands 
  from 
  which 
  an 
  abundant 
  and 
  

   cheap 
  supply 
  of 
  the 
  very 
  best 
  road 
  rock 
  can 
  be 
  readily 
  obtained. 
  

  

  Eastern 
  Adirondacks. 
  The 
  mapping 
  of 
  the 
  Elizabethtown- 
  

   Port 
  Plenry 
  quadrangles 
  is 
  reported 
  by 
  Professor 
  Kemp 
  as 
  prac- 
  

   tically 
  complete 
  and 
  the 
  manuscript 
  of 
  the 
  bulletin 
  prepared. 
  This 
  

   is 
  a 
  complicated 
  region 
  including 
  the 
  extensive 
  iron 
  bodies 
  of 
  Mine- 
  

   ville 
  and 
  vicinity 
  and 
  has 
  required 
  repeated 
  review. 
  An 
  exposition 
  

   of 
  the 
  Mineville 
  mines 
  and 
  ores 
  prepared 
  by 
  Professor 
  Kemp 
  has 
  

   been 
  published 
  during 
  the 
  year 
  as 
  a 
  special 
  part 
  of 
  Bulletin 
  119, 
  

   Geology 
  of 
  the 
  Adirondack 
  Magnetic 
  Iron 
  Ores. 
  The 
  regions 
  

   referred 
  to 
  carry, 
  along 
  the 
  shore 
  of 
  Lake 
  Champlain, 
  an 
  in- 
  

   teresting 
  display 
  of 
  the 
  Paleozoic 
  formations 
  which 
  have 
  been 
  

   specially 
  reviewed 
  by 
  Dr 
  Ruedemann 
  who 
  has* 
  found 
  that 
  the 
  

   Paleozoic 
  areas 
  which 
  are 
  of 
  semioval 
  or 
  semielliptic 
  shape, 
  open- 
  

   ing 
  toward 
  the 
  lake 
  and 
  suggesting 
  embayments, 
  consist 
  of 
  groups 
  

   of 
  small 
  fault 
  blocks 
  bounded 
  on 
  the 
  west 
  by 
  northeasterly 
  master 
  

   faults 
  and 
  broken 
  up 
  again 
  by 
  transverse 
  faults 
  at 
  various 
  angles 
  

   to 
  the 
  former. 
  The 
  small 
  blocks 
  may 
  dip 
  in 
  various 
  directions 
  but 
  

   hold 
  a 
  prevailing 
  dip 
  away 
  from 
  the 
  mountains 
  or 
  toward 
  the 
  east. 
  

   The 
  work 
  on 
  the 
  Ausable 
  and 
  Westport 
  quadrangles 
  has 
  progressed. 
  

   The 
  geology^ 
  involved 
  herein 
  is 
  similar 
  to 
  that 
  on 
  the 
  Elizabethtown 
  

   and 
  Port 
  Henry 
  sheets 
  and 
  with 
  the 
  adjustment 
  of 
  the 
  latter, 
  the 
  

   other 
  work 
  will 
  lend 
  itself 
  to 
  readier 
  solution. 
  

  

  Southeastern 
  New 
  York. 
  Geology 
  of 
  the 
  Hudson 
  Highlands 
  

   and 
  cooperation 
  with 
  the 
  Nezv 
  York 
  City 
  Board 
  of 
  Water 
  Supply. 
  

   An 
  agreement 
  entered 
  into 
  in 
  the 
  past 
  year 
  by 
  the 
  chief 
  engineer 
  

   of 
  the 
  Board 
  of 
  Water 
  Supply 
  of 
  New 
  York 
  City 
  and 
  the 
  State 
  

   Geologist 
  gives 
  to 
  the 
  latter 
  access 
  to 
  the 
  highly 
  important 
  records 
  

   of 
  deep 
  seated 
  geologic 
  structure 
  from 
  the 
  southern 
  Catskills 
  

   southward 
  to 
  the 
  mouth 
  of 
  the 
  Hudson, 
  acquired 
  in 
  the 
  course 
  of 
  

   the 
  remarkable 
  engineering 
  undertaking 
  with 
  which 
  that 
  board 
  

   is 
  concerned. 
  By 
  innumerable 
  deep 
  borings 
  on 
  both 
  sides 
  of 
  the 
  

   Hudson 
  river 
  and 
  through 
  its 
  bed, 
  in 
  a 
  region 
  where 
  the 
  geology 
  

   is 
  highly 
  complex, 
  the 
  operations 
  of 
  the 
  board's 
  engineers 
  have 
  

  

  