﻿462 
  Darton 
  and 
  Kemp 
  — 
  New 
  Dike 
  at 
  Syracuse. 
  

  

  below 
  the 
  old 
  crystallines. 
  F. 
  E. 
  Englehardt* 
  gives 
  as 
  the 
  

   result 
  of 
  the 
  State 
  well 
  at 
  Syracuse, 
  1969 
  feet 
  from 
  the 
  surface 
  

   Salina 
  to 
  and 
  154 
  feet 
  into 
  gray 
  Medina 
  sandstone. 
  Forty 
  miles 
  

   due 
  west, 
  at 
  Clyde,f 
  a 
  well, 
  begun 
  in 
  the 
  Salina, 
  went 
  1792 
  feet 
  

   and 
  stopped, 
  being 
  then 
  92 
  feet 
  into 
  the 
  Hudson 
  River 
  shales. 
  

   A 
  few 
  miles 
  north 
  of 
  Clyde, 
  a 
  well 
  at 
  Walcottf 
  penetrated 
  

   from 
  the 
  Niagara 
  on 
  the 
  surface 
  2700 
  feet, 
  and 
  stopped 
  750 
  

   feet 
  into, 
  but 
  not 
  through 
  the 
  Trenton. 
  While 
  at 
  Rochester,;): 
  

   beginning 
  in 
  the 
  Niagara, 
  a 
  well 
  was 
  put 
  down 
  3078 
  feet, 
  end- 
  

   ing 
  in 
  white 
  ferruginous 
  quartz, 
  supposed 
  to 
  be 
  Archaean. 
  

   Ashburner's 
  generalized 
  section 
  along 
  the 
  meridian 
  of 
  Clyde, 
  

   gives 
  4800 
  feet 
  from 
  the 
  Helderberg 
  to 
  the 
  Archaean, 
  and 
  the 
  

   dike 
  must 
  have 
  come 
  up 
  through 
  some 
  such 
  section 
  as 
  this, 
  

   until 
  it 
  stopped 
  in 
  the 
  Salina 
  strata. 
  

  

  Note: 
  — 
  The 
  following 
  igneous 
  intrusions 
  have 
  now 
  been 
  determined 
  microscop- 
  

   ically 
  in 
  central 
  New 
  York. 
  At 
  Syracuse, 
  peridotite, 
  G. 
  H. 
  Williams, 
  this 
  Jour- 
  

   nal, 
  Aug., 
  1887, 
  p. 
  37, 
  Bull. 
  Geol. 
  Soc, 
  Amer., 
  I, 
  533; 
  at 
  Ithaca, 
  75 
  miles 
  south 
  

   of 
  Syracuse, 
  presumably 
  peridotite, 
  like 
  preceding, 
  J. 
  P. 
  Kemp, 
  Idem., 
  Nov., 
  

   1891, 
  p. 
  410. 
  The 
  analysis 
  given 
  in 
  this 
  paper, 
  as 
  regards 
  A1 
  2 
  3 
  and 
  MgO 
  is 
  

   undoubtedly 
  untrustworthy. 
  At 
  Manheim, 
  75 
  miles 
  east 
  of 
  Syracuse, 
  alnoite, 
  

   C. 
  H. 
  Smyth, 
  Jr., 
  Idem. 
  Apr., 
  1892, 
  322, 
  Aug., 
  1893, 
  104. 
  At 
  De.witt, 
  3 
  miles 
  

   east 
  of 
  Syracuse, 
  as 
  above. 
  In 
  addition, 
  boulders 
  of 
  a 
  most 
  interesting 
  rock 
  have 
  

   been 
  found 
  at 
  Aurora, 
  N. 
  Y., 
  about 
  25 
  miles 
  north 
  of 
  Ithaca, 
  which 
  consisted 
  of 
  

   great 
  crystals 
  of 
  pyroxene 
  and 
  hornblende 
  in 
  a 
  glassy 
  ground-mass, 
  and 
  with 
  no 
  

   certain 
  olivine. 
  (J. 
  F. 
  Kemp, 
  Trans. 
  N. 
  Y. 
  Acad. 
  Sci., 
  XI, 
  126, 
  1892.) 
  Boulders 
  

   of 
  the 
  same 
  rock 
  with 
  attached, 
  fossiliferous 
  Trenton 
  limestone, 
  have 
  been 
  found 
  

   by 
  J. 
  M. 
  Clarke, 
  on 
  Canandaigua 
  lake, 
  30 
  miles 
  west 
  of 
  Aurora, 
  and 
  have 
  been 
  

   described 
  by 
  B. 
  K. 
  Emerson. 
  (12th 
  Ann. 
  Rep., 
  N. 
  Y. 
  State 
  Geologist, 
  1892, 
  pub- 
  

   lished 
  1893.) 
  We 
  may 
  expect 
  other 
  dikes 
  of 
  these 
  curious 
  basic 
  rocks 
  to 
  be 
  dis- 
  

   covered 
  in 
  the 
  New 
  York 
  Palaeozoic 
  series, 
  as 
  time 
  goes 
  by. 
  

  

  * 
  N. 
  Y. 
  Assembly 
  Doc, 
  1885, 
  No. 
  32, 
  p. 
  15. 
  Quoted 
  by 
  Ashburner 
  in 
  Trans. 
  

   Amer. 
  Inst. 
  Min. 
  Eng., 
  XVI, 
  944. 
  

  

  f 
  C. 
  S. 
  Prosser, 
  Amer. 
  Geol, 
  Oct., 
  1890, 
  203-204. 
  The 
  same 
  figures 
  are 
  given 
  

   by 
  Ashburner, 
  loc. 
  cit. 
  

  

  X 
  H. 
  L. 
  Fairchild, 
  Proa, 
  Rochester 
  Acad. 
  Sci. 
  I, 
  184, 
  1891. 
  

  

  