﻿620 
  Forty- 
  seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  are 
  at 
  this 
  locality 
  twelve 
  feet 
  of 
  moderately 
  coarse-grained, 
  

   dark-colored 
  limestones 
  in 
  beds 
  one 
  to 
  two 
  feet 
  thick, 
  over- 
  

   laid 
  by 
  twenty-three 
  feet 
  of 
  dark-colored, 
  thin-bedded 
  members 
  

   containing 
  lighter-colored 
  streaks 
  of 
  limestone 
  below 
  and 
  thin 
  

   intercalations 
  of 
  black 
  slates 
  above. 
  The 
  massive 
  series 
  lies 
  on 
  

   four 
  feet 
  of 
  very 
  compact 
  gray 
  beds, 
  with 
  abundant 
  gasteropoda 
  

   and 
  cephalopoda, 
  which 
  in 
  turn 
  lie 
  on 
  the 
  thin 
  series 
  of 
  typical 
  

   Calciferous 
  members 
  overlying 
  the 
  "fucoidal" 
  beds. 
  These 
  

   features 
  continue 
  in 
  the 
  region 
  about 
  Amsterdam 
  and 
  eastward 
  

   to 
  the 
  Hoffman's 
  Ferry 
  fault, 
  the 
  massive 
  series 
  becoming 
  some- 
  

   what 
  thicker 
  and 
  coarser 
  grained 
  in 
  the 
  easternmost 
  exposures. 
  

   In 
  the 
  quarries 
  and 
  stream 
  cuts 
  north 
  of 
  Amsterdam, 
  there 
  are 
  

   exposed 
  seventeen 
  feet 
  of 
  the 
  coarse-grained, 
  massive 
  series 
  here, 
  

   rather 
  thinner-bedded 
  than 
  usual, 
  At 
  the 
  extensive 
  quarries, 
  

   two 
  miles 
  northwest 
  of 
  Hoffman's 
  Ferry, 
  the 
  lower 
  member 
  is 
  

   very 
  coarse-grained, 
  soft, 
  massively-bedded, 
  highly 
  fossiliferous 
  

   limestone 
  and 
  has 
  a 
  thickness 
  of 
  about 
  twenty 
  feet. 
  It 
  is 
  sepa- 
  

   rated 
  from 
  the 
  Calciferous 
  sandstone 
  by 
  three 
  feet 
  of 
  darkrcolored, 
  

   very 
  compact 
  limestone. 
  In 
  the 
  bed 
  of 
  a 
  creek 
  in 
  the 
  slope 
  south 
  

   of 
  the 
  Mohawk 
  opposite 
  Amsterdam 
  there 
  is 
  a 
  fine, 
  continuous 
  

   exposure 
  from 
  the 
  Utica 
  slate 
  to 
  the 
  Calciferous, 
  in 
  which 
  the 
  

   coarse, 
  massive 
  beds 
  are 
  lacking. 
  The 
  members 
  are 
  as 
  follows 
  : 
  

   Utica 
  Slate: 
  

  

  Feet. 
  

  

  Thin-bedded, 
  dark, 
  very 
  fossiliferous 
  limestone, 
  with 
  black 
  

   shale 
  intercalations 
  toward 
  the 
  top 
  ; 
  Trenton 
  12 
  

  

  Darker, 
  coarser-grained, 
  more 
  massive 
  limestone, 
  in 
  beds 
  

   from 
  two 
  to 
  four 
  inches 
  thick, 
  very 
  fossiliferous 
  ; 
  Trenton, 
  8 
  

  

  Compact, 
  dark, 
  heavily 
  -bedded 
  limestones, 
  weathering 
  much 
  

   lighter 
  and 
  containing 
  cephalopoda 
  and 
  gasteropoda, 
  with 
  

   several 
  thin 
  intercalations 
  of 
  dark, 
  coarse-grained 
  lime- 
  

   stone 
  containing 
  many 
  Trenton 
  brachiopoda 
  ; 
  Birdseye. 
  .. 
  8 
  

  

  Dark-gray, 
  moderately 
  fine-grained 
  limestone 
  containing 
  

   Black 
  Kiver 
  corals, 
  including 
  Columnaria 
  3 
  

  

  Yery 
  compact, 
  fine-grained, 
  dark-colored, 
  massively-bedded 
  

   limestone, 
  weathering 
  somewhat 
  lighter 
  6 
  

  

  Mottled 
  lighter 
  and 
  darker 
  gray, 
  arenaceous 
  limestone, 
  with 
  

   glimmering 
  fracture, 
  contains 
  Opkileta 
  near 
  the 
  top. 
  

  

  