﻿Brigham 
  — 
  Drift 
  Bowlders 
  in 
  Central 
  New 
  York. 
  217 
  

  

  Archaean 
  _. 
  12 
  

  

  Oris'kany 
  sandstone 
  17 
  

  

  Cornif 
  erous 
  _ 
  2 
  

  

  Doubtful 
  _ 
  1 
  

  

  Hamilton 
  (subjacent) 
  28 
  

  

  60 
  

  

  The 
  altitude 
  here 
  is 
  about 
  1^00 
  feet, 
  or 
  100 
  feet 
  above 
  the 
  

   valley. 
  In 
  eastern 
  Madison, 
  altitude 
  about 
  1600 
  feet, 
  exten- 
  

   sive 
  heaps 
  are 
  composed 
  wholly 
  of 
  pieces 
  but 
  few 
  inches 
  in 
  

   size, 
  and 
  at 
  least 
  99 
  per 
  cent 
  are 
  from 
  the 
  local 
  Hamilton. 
  This 
  

   freedom 
  from 
  outside 
  material, 
  with 
  limited 
  exceptions, 
  is 
  

   characteristic 
  of 
  the 
  higher 
  altitudes 
  of 
  the 
  whole 
  region. 
  A 
  

   similar 
  estimate 
  in 
  Hamilton, 
  choosing 
  all 
  fragments 
  in 
  a 
  large 
  

   heap, 
  above 
  one 
  foot 
  diameter, 
  gave 
  : 
  

  

  Archaean 
  ... 
  50 
  

  

  Oriskany 
  sandstone 
  17 
  

  

  Corniferous 
  2 
  ■ 
  

  

  Oneida 
  and 
  Medina 
  were 
  present 
  but 
  all 
  smaller, 
  likewise 
  the 
  

   Hamilton, 
  while 
  the 
  larger 
  Oriskany 
  s 
  from 
  the 
  same 
  field, 
  as 
  

   was 
  learned, 
  had 
  been 
  buried. 
  The 
  cases 
  cited 
  represent 
  more 
  

   than 
  the 
  average 
  prevalence 
  of 
  the 
  Archaean 
  in 
  number, 
  while 
  

   in 
  mass, 
  the 
  Oriskany 
  would 
  outrank 
  the 
  Archaean 
  by 
  many 
  

   hundred 
  per 
  cent. 
  

  

  In 
  the 
  town 
  of 
  Eaton, 
  near 
  Hamilton, 
  one 
  northern 
  piece, 
  

   well-rounded, 
  measured 
  9x7-Jx6f 
  feet. 
  This 
  is 
  the 
  largest 
  

   Archaean 
  bowlder 
  observed 
  by 
  the 
  writer 
  south 
  of 
  the 
  Mohawk 
  

   River. 
  In 
  90 
  miles 
  traversed 
  in 
  the 
  towns 
  of 
  Madison, 
  Ham- 
  

   ilton, 
  Eaton 
  and 
  Lebanon, 
  less 
  than 
  a 
  dozen 
  Archaean 
  masses 
  

   were 
  observed 
  having 
  average 
  diameters 
  of 
  four 
  feet 
  or 
  more. 
  

   From 
  Earlville 
  to 
  Smyrna 
  no 
  Archaean 
  was 
  seen 
  above 
  2X2J- 
  

   f 
  eet. 
  At 
  Smyrna, 
  there 
  is 
  a 
  morainic 
  accumulation 
  of 
  considera- 
  

   ble 
  extent. 
  A 
  60-foot 
  section 
  is 
  exposed 
  showing 
  discordant 
  

   beds 
  of 
  sand 
  and 
  coarse 
  gravel, 
  with 
  6 
  to 
  12 
  feet 
  of 
  till 
  containing 
  

   coarse, 
  angular 
  local 
  material, 
  at 
  the 
  top. 
  100 
  pieces 
  from 
  a 
  

   heap 
  rejected 
  in 
  procuring 
  gravel, 
  ranging 
  from 
  the 
  size 
  of 
  

   one's 
  fist 
  to 
  five 
  or 
  six 
  inches, 
  gave 
  the 
  following 
  count 
  : 
  

  

  Oneida 
  _. 
  __ 
  _ 
  2 
  

  

  Clinton 
  __ 
  3 
  

  

  Doubtful, 
  perhaps 
  Hudson 
  TCiver 
  or 
  Clinton 
  10 
  

  

  Doubtful, 
  probably 
  Potsdam 
  and 
  Medina. 
  . 
  8 
  

  

  Helderberg 
  limestones 
  26 
  

  

  Hamilton 
  (subjacent) 
  _ 
  51 
  

  

  100 
  

  

  Am. 
  Jour. 
  Sci.— 
  Third 
  Series, 
  Yol. 
  XLIX, 
  No. 
  291.— 
  March, 
  1805. 
  

   15 
  

  

  