﻿Report 
  of 
  the 
  State 
  Geologist. 
  617 
  

  

  Feet. 
  

  

  Typical 
  birdseye 
  layers 
  2£ 
  

  

  Moderately-dark, 
  compact 
  limestone, 
  no 
  " 
  birdseyes 
  " 
  2-J 
  

  

  Yery 
  hard, 
  dark, 
  compact 
  limestone, 
  with 
  14 
  inches 
  black 
  

  

  bed 
  at 
  base, 
  no 
  " 
  birdseyes 
  " 
  3 
  

  

  Light-colored 
  limestone, 
  compact 
  in 
  part, 
  with 
  a 
  few 
  widely- 
  

   scattered 
  " 
  birdseyes 
  " 
  in 
  more 
  compact 
  portions 
  3 
  

  

  Light-colored, 
  moderately 
  compact, 
  even-grained 
  limestone 
  

   in 
  six 
  to 
  ten-inch 
  layers, 
  intermediate 
  in 
  character 
  between 
  

  

  Birdseye 
  and 
  Calciferous 
  6 
  

  

  Thin-bedded, 
  soft 
  « 
  Calciferous 
  " 
  1| 
  

  

  In 
  the 
  small 
  inlying 
  exposure 
  at 
  Ephratah 
  at 
  a 
  quarry 
  a 
  mile 
  

   east 
  of 
  Salisbury 
  Centre 
  and 
  in 
  the 
  exposures 
  near 
  the 
  fault 
  

   southwest 
  of 
  Keek's 
  Corners 
  the 
  full 
  thickness 
  of 
  the 
  Birdseye 
  

   beds 
  is 
  not 
  exhibited, 
  but 
  the 
  typical 
  characteristics 
  are 
  pre- 
  

   sented. 
  At 
  Canajoharie 
  the 
  Birdseye 
  formation 
  is 
  not 
  charac- 
  

   terized 
  and 
  the 
  Trenton 
  appears 
  to 
  lie 
  directly 
  on 
  the 
  Calciferous. 
  

   At 
  Tribes 
  Hill 
  and 
  about 
  Amsterdam 
  the 
  formation 
  is 
  repre- 
  

   sented 
  by 
  from 
  three 
  to 
  five 
  feet 
  of 
  very 
  compact, 
  gray 
  to 
  black, 
  

   thin-bedded 
  limestone, 
  with 
  very 
  rare 
  birdseyes. 
  They 
  are 
  

   sharply 
  separated 
  from 
  a 
  somewhat 
  irregular 
  surface 
  of 
  the 
  Cal- 
  

   ciferous 
  sandstone, 
  a 
  relation 
  which 
  is 
  clearly 
  exposed 
  in 
  the 
  

   creek 
  behind 
  Amsterdam 
  in 
  a 
  small 
  gorge 
  at 
  an 
  altitude 
  115 
  

   feet 
  above 
  the 
  railroad 
  depot. 
  The 
  south 
  dip 
  is 
  steep 
  here. 
  

  

  The 
  easternmost 
  locality 
  of 
  the 
  formation 
  that 
  I 
  have 
  observed 
  

   is 
  at 
  Eock 
  City 
  Falls. 
  Here 
  there 
  is 
  a 
  three-foot 
  bed 
  of 
  dense, 
  

   dark 
  limestone 
  which 
  has 
  the 
  characteristic, 
  white 
  weathering, 
  

   etc.; 
  of 
  Birdseye 
  limestone 
  and 
  contains 
  a 
  few 
  ill-defined 
  frag- 
  

   ments 
  of 
  fucoids. 
  

  

  In 
  the 
  eastern 
  and 
  southern 
  part 
  of 
  the 
  region 
  the 
  Birdseye 
  

   horizon 
  appears 
  to 
  be 
  represented 
  by 
  a 
  series 
  of 
  very 
  fine-grained 
  

   black 
  limestones, 
  which 
  weather 
  white 
  or 
  light 
  gray 
  and 
  contain 
  

   a 
  fauna 
  of 
  small 
  cephalopods 
  and 
  gastropods. 
  This 
  has 
  been 
  

   considered 
  the 
  basal 
  member 
  of 
  the 
  Trenton, 
  but 
  its 
  lithologic 
  

   characters 
  and 
  position 
  are 
  strong 
  evidences 
  that 
  it 
  is 
  of 
  the 
  

   Birdseye 
  horizon. 
  It 
  is 
  seen 
  about 
  Amsterdam, 
  particularly 
  in 
  a 
  

   creek 
  bed 
  on 
  the 
  opposite 
  side 
  of 
  the 
  Mohawk, 
  where 
  it 
  has 
  thin 
  

   intercalations 
  of 
  black, 
  coarse-grained 
  limestones 
  containing 
  

   Trenton 
  brachiopoda. 
  It 
  is 
  well 
  exposed 
  to 
  a 
  thickness 
  of 
  six 
  

   78 
  

  

  