﻿De 
  Witt, 
  near" 
  Syracuse, 
  New 
  York. 
  

  

  461 
  

  

  but 
  the 
  indications 
  were 
  that 
  it 
  came 
  from 
  the 
  excavation. 
  In 
  

   studying 
  a 
  series 
  of 
  slides, 
  however, 
  from 
  the 
  material 
  i*eceived 
  

   five 
  years 
  ago 
  from 
  Dr. 
  Williams, 
  one 
  slide 
  contained 
  a 
  crystal 
  

   of 
  brown 
  hornblende 
  like 
  the 
  above, 
  and 
  another 
  had 
  in 
  the 
  

   midst 
  of 
  the 
  porphyritic 
  peridotite, 
  a 
  chance 
  inclusion 
  about 
  10 
  mm 
  

   across 
  which 
  consisted 
  of 
  microperthitic 
  orthoclase, 
  in 
  largest 
  

   part, 
  with 
  some 
  plagioclase, 
  brown 
  hornblende 
  and 
  titaniferous 
  

   magnetite. 
  It 
  is 
  undoubtedly 
  a 
  fragment 
  of 
  the 
  underlying 
  

   Archeean 
  crystallines, 
  picked 
  up 
  by 
  the 
  intrusive 
  peridotite, 
  for 
  

   its 
  edges 
  are 
  sharp 
  and 
  all 
  the 
  associations 
  are 
  of 
  this 
  character. 
  

   Mr. 
  Darton 
  also 
  gathered 
  specimens 
  with 
  undoubted 
  inclusions 
  

   of 
  sedimentary 
  rock. 
  One 
  of 
  these 
  is 
  an 
  argillaceous 
  sandstone 
  

   formed 
  of 
  quartz 
  grains 
  and 
  interstitial 
  clay 
  ; 
  and 
  the 
  others 
  

   are 
  earthy 
  limestones 
  showing, 
  under 
  the 
  microscope, 
  sections 
  

   of 
  small 
  brachiopod 
  shells. 
  So 
  appreciable 
  evidence 
  of 
  contact 
  

   metamorphism 
  could 
  be 
  detected. 
  

  

  Dewitt. 
  Syracuse. 
  Kentucky. 
  

  

  Si0 
  o 
  36-80 
  40-67 
  33*84 
  

  

  Ti0 
  2 
  ._ 
  1-26 
  .._. 
  3-78 
  

  

  A1 
  2 
  3 
  4*16 
  5-13 
  5-88 
  

  

  0r 
  o 
  O 
  3 
  0-20 
  0-18 
  

  

  Fe;0 
  3 
  ..,.. 
  .:.. 
  7-04 
  

  

  FeO 
  8-33 
  8-12 
  5*16 
  

  

  MnO 
  0-13 
  0-16 
  

  

  NiO 
  0-09 
  .... 
  0-10 
  

  

  CoO 
  trace 
  

  

  CaO 
  8-63 
  946 
  

  

  BaO._ 
  0-12 
  0-06 
  

  

  SrO 
  trace 
  - 
  

  

  MgO 
  25-98 
  32-61 
  22-96 
  

  

  K„0 
  2-48 
  2-04 
  

  

  Na 
  o 
  _ 
  0-17 
  0-33 
  

  

  H 
  2 
  1277 
  7-50 
  

  

  P 
  2 
  5 
  0-47 
  0-89 
  

  

  C0 
  2 
  295 
  0-43 
  

  

  CI 
  0-05 
  

  

  F 
  ._.. 
  .... 
  ? 
  

  

  S0 
  3 
  0-06 
  

  

  S.._ 
  0-95 
  

  

  H 
  2 
  below 
  110° 
  0-51 
  

  

  HOabovellO 
  6*93 
  

  

  Less 
  = 
  S 
  

  

  100-22 
  

  

  •47 
  

  

  99-75 
  

  

  99-30 
  

  

  99-86 
  

  

  It 
  is 
  interesting 
  to 
  note 
  the 
  thickness 
  of 
  sedimentary 
  strata 
  

   through 
  which 
  this 
  dike 
  must 
  have 
  come 
  from 
  its 
  source 
  in 
  or 
  

  

  