﻿622 
  Forty-seventh 
  Report 
  on 
  the 
  State 
  Museum. 
  

  

  stated 
  by 
  Walcott 
  to 
  amount 
  to 
  more 
  than 
  forty 
  feet 
  in 
  this 
  

   region. 
  

  

  Between 
  Saratoga 
  and 
  Glens 
  Falls 
  the 
  Trenton 
  is 
  at 
  first 
  cut 
  

   off 
  by 
  the 
  Calciferous, 
  brought 
  up 
  by 
  the 
  Springs 
  fault, 
  and 
  then 
  

   deeply 
  buried 
  beneath 
  sands 
  and 
  glacial 
  drift. 
  

  

  At 
  Glens 
  Falls 
  there 
  are 
  superb 
  exposures 
  in 
  quarries 
  and 
  

   cliffs 
  along 
  the 
  both 
  banks 
  of 
  the 
  Hudson 
  for 
  half 
  a 
  mile 
  or 
  

   more. 
  There 
  is 
  here 
  a 
  low 
  anticlinal 
  through 
  which 
  the 
  river 
  

   has 
  cut 
  down 
  to 
  the 
  upper 
  beds 
  of 
  the 
  Calciferous, 
  exposing 
  in 
  

   the 
  banks 
  all 
  the 
  members 
  of 
  the 
  Trenton 
  group 
  of 
  limestones. 
  

   Plate 
  12 
  represents 
  the 
  exposure 
  in 
  the 
  north 
  bank 
  with 
  the 
  

   bared 
  surface 
  of 
  the 
  Calciferous 
  sloping 
  out 
  into 
  the 
  river 
  for 
  

   some 
  distance 
  on 
  the 
  right. 
  

  

  The 
  section 
  at 
  Glens 
  Falls 
  (north 
  bank) 
  is 
  as 
  follows 
  : 
  

  

  Feet. 
  

  

  Thin-bedded 
  black 
  limestones 
  in 
  beds 
  three 
  to 
  eight 
  inches. 
  . 
  10 
  

  

  Black 
  marble 
  ten 
  to 
  fourteen-inch 
  beds 
  3 
  

  

  Black 
  marble 
  in 
  one 
  or 
  two 
  beds 
  13 
  

  

  Black, 
  massively 
  -bedded, 
  fine-grained 
  limestone 
  of 
  floor 
  of 
  

   quarries, 
  f 
  ucoids 
  and 
  crinoids 
  on 
  surface, 
  with 
  irregular 
  

  

  dark-gray, 
  very 
  fine-grained 
  streaks 
  in 
  middle 
  3 
  

  

  Dark-gray, 
  mostly 
  very 
  fine-grained 
  limestone 
  in 
  beds 
  four 
  

   to 
  ten 
  inches 
  thick, 
  with 
  streaks 
  of 
  coarser, 
  darker 
  lime- 
  

   stone 
  containing 
  Trenton 
  brachiopods 
  fracture 
  semi-con- 
  

  

  choidal 
  ; 
  weathered 
  surface 
  light 
  gray 
  25 
  

  

  Black, 
  compact 
  limestones 
  in 
  beds 
  two 
  to 
  six 
  inches 
  thick, 
  

   with 
  black 
  slate 
  intercalations 
  and 
  abundant 
  Black 
  Eiver 
  

   corals, 
  including 
  Golumnaria. 
  

  

  Inches. 
  

  

  Moderately 
  dark-gray 
  arenaceous 
  limestone, 
  with 
  coarser- 
  

   grained, 
  darker 
  reticulated 
  blotchings 
  in 
  layers 
  

  

  " 
  Fucoidal 
  " 
  layer 
  of 
  Calciferous 
  3 
  

  

  Black, 
  shaly 
  limestone 
  3 
  

  

  Calciferous 
  sandstone 
  at 
  base 
  

  

  The 
  upper 
  members 
  are 
  cross-bedded 
  at 
  the 
  falls, 
  an 
  unusual 
  

   and 
  curious 
  feature 
  for 
  a 
  limestone. 
  

  

  The 
  aspect 
  of 
  the 
  black 
  marble 
  beds 
  and 
  a 
  portion 
  of 
  the 
  over- 
  

   lying 
  series 
  of 
  this 
  locality 
  is 
  shown 
  in 
  plate 
  13. 
  

  

  In 
  the 
  Lake 
  George 
  region 
  an 
  interesting 
  outlier 
  of 
  Trenton 
  

   limestone 
  was 
  discovered 
  five 
  miles 
  south 
  of 
  Kattskill 
  bay 
  abutting 
  

  

  