﻿656 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  where 
  in 
  this 
  area 
  is 
  the 
  vein 
  of 
  wollastonite, 
  garnet 
  and 
  horn- 
  

   blende 
  referred 
  to 
  by 
  ^Emmons 
  (Geol. 
  2nd 
  Disk, 
  p. 
  286) 
  and 
  

   Beck 
  (Mineralogy 
  of 
  K 
  Y., 
  p. 
  270.) 
  The 
  wollastonite 
  was 
  

   analyzed 
  by 
  Vanuxem. 
  (Jour. 
  Phila. 
  Acad. 
  Sci., 
  II, 
  182, 
  1822.) 
  

   The 
  vein 
  is 
  said 
  to 
  be 
  in 
  gneiss, 
  which 
  probably 
  means 
  gneissoid 
  

   anorthosite. 
  The 
  minerals 
  suggest 
  the 
  presence 
  of 
  at 
  least 
  a 
  

   fragment 
  of 
  crystalline 
  limestone. 
  As 
  we 
  did 
  not 
  happen 
  to 
  

   notice 
  the 
  record 
  of 
  the 
  occurrence 
  until 
  our 
  return, 
  it 
  was 
  not 
  

   investigated. 
  

  

  Series 
  IV. 
  All 
  the 
  palaeozoic 
  members, 
  from 
  the 
  Potsdam 
  

   sandstone 
  to 
  the 
  Utica 
  slate, 
  are 
  represented 
  in 
  Willsborough. 
  

   The 
  Potsdam 
  forms 
  a 
  fringe 
  on 
  the 
  anorthosite 
  ridges 
  along 
  

   the 
  Boquet 
  river, 
  and 
  in 
  its 
  exposures 
  to 
  the 
  eastward 
  bends 
  

   with 
  it 
  so 
  that 
  it 
  appears 
  in 
  the 
  village 
  of 
  Willsborough 
  in 
  fine 
  

   ledges. 
  It 
  is 
  soon 
  afterward 
  buried 
  in 
  the 
  heavy 
  sand 
  beds 
  at 
  

   the 
  river's 
  mouth, 
  but 
  is 
  seen 
  on 
  the 
  lake 
  shore 
  to 
  the 
  north. 
  It 
  

   is 
  so 
  soon 
  succeeded 
  by 
  the 
  Chazy 
  limestone 
  that 
  a 
  fault 
  

   is 
  unquestionably 
  present. 
  The 
  Calciferous 
  sandstone 
  overlies 
  

   it 
  in 
  a 
  small 
  area 
  on 
  the 
  south. 
  The 
  Chazy 
  appears 
  at 
  

   the 
  base 
  of 
  Willsborough 
  Point 
  and 
  about 
  half 
  way 
  down 
  

   it. 
  It 
  has 
  been 
  opened 
  for 
  building 
  stone 
  in 
  Clark's 
  quar- 
  

   ries 
  and 
  was 
  in 
  former 
  years 
  the 
  basis 
  of 
  a 
  very 
  large 
  

   industry. 
  The 
  stone 
  was 
  called 
  Champlain 
  blue 
  stone 
  and 
  had 
  a 
  

   high 
  reputation. 
  To 
  the 
  north 
  it 
  runs 
  under 
  the 
  Champlain 
  clays 
  

   and 
  the 
  next 
  rock 
  exposure 
  is 
  of 
  ITtica 
  slate 
  at 
  the 
  end 
  of 
  the 
  point. 
  

   This 
  is 
  the 
  only 
  outcrop 
  of 
  this 
  formation 
  except 
  the 
  little 
  areas 
  on 
  

   the 
  Four 
  Brothers 
  islands. 
  The 
  Trenton 
  appears 
  just 
  north 
  of 
  the 
  

   Essex 
  line, 
  but 
  is 
  soon 
  buried 
  under 
  sand 
  and 
  clay. 
  Another 
  

   small 
  exposure 
  outcrops 
  against 
  the 
  anorthosite 
  at 
  the 
  head 
  of 
  

   Willsborough 
  bay 
  and 
  is 
  rich 
  in 
  fossils. 
  

  

  Series 
  V. 
  The 
  porphyry 
  forms 
  several 
  dikes. 
  Two 
  appear 
  

   at 
  the 
  quarries 
  on 
  Willsborough 
  Point, 
  and 
  are 
  well 
  exposed, 
  

   another 
  cuts 
  the 
  Potsdam 
  on 
  the 
  lake 
  shore, 
  about 
  the 
  mouth 
  of 
  

   the 
  Boquet 
  river. 
  

  

  The 
  diabase 
  dikes 
  are 
  very 
  abundant 
  in 
  the 
  cuts 
  of 
  the 
  

   Delaware 
  and 
  Hudson 
  railroad 
  on 
  the 
  west 
  side 
  of 
  Willsborough 
  

   bay. 
  At 
  the 
  extreme 
  end 
  of 
  Willsborough 
  Point 
  five 
  basic 
  

   dikes 
  cut 
  the 
  Utica 
  slates, 
  and 
  near 
  Long 
  pond, 
  at 
  121, 
  another 
  

   cuts 
  the 
  anorthosite. 
  

  

  