﻿Report 
  of 
  the 
  State 
  Geologist, 
  621 
  

  

  This 
  last 
  member, 
  which 
  is 
  typical 
  Calciferous, 
  is 
  separated 
  

   from 
  the 
  overlying 
  beds 
  by 
  a 
  sharp 
  break. 
  

  

  North 
  from 
  Amsterdam 
  the 
  formation 
  extends 
  west 
  of 
  Perth 
  

   to 
  the 
  hills 
  south 
  and 
  east 
  of 
  Fonda's 
  Bush, 
  probably 
  uniting 
  with 
  

   the 
  area 
  extending 
  along 
  the 
  Tribes 
  Hill 
  fault. 
  Owing 
  to 
  heavy 
  

   drift 
  cover 
  its 
  distribution 
  in 
  this 
  region 
  could 
  not 
  be 
  definitely 
  

   determined. 
  The 
  only 
  outcrop 
  found 
  in 
  this 
  belt 
  was 
  in 
  an 
  old 
  

   quarry 
  three 
  and 
  three-quarters 
  miles 
  due 
  north 
  of 
  Amsterdam 
  

   station, 
  where 
  the 
  Eirdseye 
  beds 
  are 
  exposed. 
  

  

  North 
  of 
  May 
  field 
  there 
  are 
  two 
  small 
  areas 
  of 
  Trenton 
  lime- 
  

   stone 
  lying 
  between 
  the 
  faults 
  which 
  are 
  well 
  exposed 
  in 
  a 
  quarry 
  

   is 
  the 
  with 
  the 
  relations 
  shown 
  in 
  figure 
  1. 
  The 
  southernmost 
  

   in 
  each, 
  thinner-bedded 
  upper 
  members 
  of 
  the 
  formation, 
  and 
  

   the 
  northern 
  area 
  exhibits 
  the 
  coarse-grained, 
  massive 
  beds 
  of 
  

   the 
  lower 
  member. 
  

  

  At 
  the 
  saw-mill 
  a 
  mile 
  due 
  southwest 
  of 
  North 
  Broadalbin 
  

   there 
  is 
  a 
  fine 
  exposure 
  of 
  upper 
  Trenton 
  beds 
  in 
  the 
  creek. 
  

   There 
  are 
  exhibited 
  fifteen 
  feet 
  of 
  thin-bedded, 
  dark-colored, 
  very 
  

   fossiliferous 
  limestones. 
  Similar 
  beds 
  are 
  also 
  seen 
  at 
  a 
  some- 
  

   what 
  lower 
  horizon 
  just 
  above 
  Steever's 
  mill, 
  with 
  underlying 
  

   brecciated 
  beds 
  of 
  fine-grained, 
  light-colored 
  limestones. 
  

  

  Near 
  Galway 
  there 
  are 
  several 
  exposures 
  of 
  lower 
  memoers 
  on 
  

   the 
  blocks 
  between 
  the 
  faults. 
  They 
  are 
  only 
  moderately- 
  

   massive 
  and 
  are 
  underlaid 
  by 
  thin-bedded, 
  very 
  fine-grained 
  

   beds 
  containing 
  cephalopoda 
  and 
  gasteropoda 
  and 
  weathering 
  

   light-colored. 
  At 
  Rock 
  City 
  Mills 
  the 
  Trenton 
  beds 
  outcrop 
  in 
  

   considerable 
  force, 
  but 
  not 
  quite 
  to 
  their 
  entire 
  thickness. 
  The 
  

   amount 
  exposed 
  is 
  twenty-eight 
  feet, 
  consisting 
  of 
  thin-bedded 
  

   members 
  below, 
  with 
  heavier-bedded 
  and 
  slightly 
  coarser- 
  

   grained 
  beds 
  above. 
  Below 
  is 
  the 
  three-foot 
  bed 
  of 
  Birdseye 
  

   limestone 
  before 
  mentioned, 
  resting 
  on 
  Calciferous 
  sandstone, 
  

   from 
  which 
  it 
  is 
  sharply 
  separated. 
  

  

  In 
  the 
  Trenton 
  belt 
  west 
  of 
  Saratoga 
  there 
  are 
  several 
  excel- 
  

   lent 
  exposures, 
  of 
  which 
  the 
  most 
  noteworthy 
  is 
  the 
  large 
  quarry 
  

   at 
  Howland's 
  Mill, 
  three 
  miles 
  due 
  west- 
  southwest 
  from 
  the 
  

   Springs. 
  The 
  nature 
  of 
  the 
  beds 
  in 
  this 
  quarry 
  are 
  in 
  some 
  

   measure 
  represented 
  in 
  plate 
  6. 
  

  

  There 
  are 
  twenty 
  feet 
  of 
  beds 
  exposed 
  in 
  and 
  about 
  this 
  

   quarry, 
  but 
  not 
  the 
  entire 
  thickness 
  of 
  the 
  formation, 
  which 
  is 
  

  

  