﻿618 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum, 
  

  

  feet 
  in 
  an 
  old 
  quarry, 
  three 
  and 
  three-quarter 
  miles 
  due 
  north 
  of 
  

   Amsterdam 
  station 
  ; 
  in 
  a 
  quarry 
  and 
  at 
  the 
  bridge 
  a 
  short 
  way 
  

   above 
  Steever's 
  mills, 
  in 
  Broadalbin, 
  about 
  Galway, 
  near 
  the 
  

   Hoffman's 
  Ferry 
  fault 
  two 
  miles 
  north 
  of 
  the 
  Mohawk 
  and 
  with 
  

   much 
  inter 
  bedded 
  thin 
  layers 
  of 
  Trenton, 
  at 
  Glens 
  Falls 
  some 
  

   distance 
  below 
  the 
  black 
  marble 
  beds. 
  

  

  In 
  the 
  central 
  Mohawk 
  valley 
  region 
  the 
  Birdseye 
  member 
  is 
  

   succeeded 
  abruptly 
  by 
  the 
  Trenton 
  limestones, 
  suggesting, 
  as 
  

   stated 
  by 
  Yanuxem, 
  a 
  break 
  in 
  the 
  stratigraphic 
  succession 
  in 
  

   that 
  region. 
  This 
  was 
  found 
  to 
  be 
  very 
  apparent 
  in 
  the 
  Little 
  

   Falls 
  and 
  West 
  Canada 
  creek 
  regions, 
  but 
  farther 
  northward 
  the 
  

   gap 
  is 
  occupied 
  by 
  the 
  Black 
  Eiver 
  limestone 
  beds.. 
  In 
  a 
  small 
  

   area 
  near 
  Amsterdam 
  and 
  in 
  the 
  Glens 
  Falls 
  region 
  the 
  Black 
  

   Eiver 
  beds 
  appear 
  to 
  be 
  represented, 
  together 
  with 
  a 
  heavily- 
  

   bedded 
  member 
  at 
  the 
  base 
  of 
  the 
  Trenton. 
  In 
  a 
  small 
  stream 
  

   emptying 
  into 
  the 
  Mohawk 
  opposite 
  Amsterdam 
  there 
  is 
  a 
  three- 
  

   foot 
  bed 
  of 
  coarse 
  limestone 
  of 
  dark 
  gray 
  color 
  containing 
  

   corals, 
  including 
  Columnaria 
  alveolata, 
  which 
  I 
  believe 
  repre- 
  

   sents 
  the 
  Black 
  River 
  horizon. 
  It 
  lies 
  on 
  the 
  representative 
  of 
  

   the 
  Birdseye 
  horizon, 
  a 
  six-foot 
  bed 
  of 
  very 
  fine-grained, 
  black 
  

   limestone, 
  which 
  weathers 
  very 
  light 
  colored 
  and 
  lies 
  in 
  turn 
  on 
  

   Calciferous 
  beds 
  containing 
  Ophileta. 
  

  

  At 
  Glens 
  Falls 
  there 
  is 
  a 
  three-foot 
  bed 
  of 
  hard, 
  compact, 
  dark 
  

   limestone, 
  with 
  blacky 
  shale 
  streaks, 
  which 
  holds 
  abundant 
  

   Columnaria 
  and 
  other 
  corals 
  of 
  the 
  Black 
  River 
  fauna. 
  It 
  lies 
  

   directly 
  on 
  the 
  "fucoidal" 
  member 
  of 
  the 
  Calciferous 
  series. 
  

   Five 
  miles 
  northeast 
  of 
  Glens 
  Falls 
  at 
  a 
  point 
  three 
  and 
  one- 
  

   quarter 
  miles 
  due 
  northwest 
  of 
  Dunham's 
  Basin 
  a 
  small 
  stream 
  

   exposes 
  a 
  two-foot 
  bed 
  of 
  very 
  compact 
  dark 
  limestone 
  lying 
  on 
  

   the 
  "fucoidal" 
  bed, 
  which 
  may 
  possibly 
  be 
  Black 
  River. 
  At 
  

   Rock 
  City 
  mills 
  the 
  formation 
  is 
  absent 
  unless 
  I 
  am 
  mistaken 
  as 
  

   to 
  the 
  identity 
  of 
  the 
  supposed 
  Birdsey 
  embeds 
  mentioned 
  above. 
  

   Walcott* 
  gives 
  the 
  thickness 
  of 
  the 
  Birdseye 
  limestone 
  as 
  six 
  

   feet 
  and 
  the 
  Black 
  River 
  limestone 
  as 
  four 
  feet 
  at 
  Saratoga. 
  

  

  The 
  Trenton 
  limestone 
  comprises 
  three 
  principal 
  members, 
  of 
  

   which 
  only 
  two 
  have 
  been 
  observed 
  occurring 
  together. 
  From 
  

   eastern 
  Oneida 
  county 
  southward 
  the 
  upper 
  member 
  is 
  a 
  thick- 
  

  

  * 
  Loc. 
  cit. 
  p. 
  346. 
  

  

  