﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  559 
  

  

  The 
  eastward 
  clastic 
  development 
  of 
  the 
  Trenton 
  is 
  farther 
  in- 
  

   dicated 
  by 
  the 
  facts 
  which 
  have 
  been 
  gathered 
  by 
  others 
  in 
  re- 
  

   gard 
  to 
  the 
  thickness 
  and 
  fossil 
  contents 
  of 
  this 
  Trenton 
  in 
  the 
  

   Hudson 
  and 
  Mohawk 
  valley 
  regions. 
  As 
  noted 
  in 
  the 
  introduc- 
  

   tion, 
  the 
  fauna 
  of 
  the 
  Trenton 
  limestone 
  has 
  in 
  the 
  limestone 
  

   belts 
  to 
  the 
  south 
  only 
  a 
  lower 
  Trenton 
  aspect. 
  This 
  limestone 
  

   is 
  directly 
  followed 
  by 
  shales; 
  hence 
  the 
  middle 
  and 
  upper 
  

   Trenton 
  beds 
  must 
  either 
  be 
  absent 
  entirely 
  or 
  be 
  represented 
  

   by 
  another 
  facies. 
  The 
  possibility 
  that 
  the 
  middle 
  and 
  upper 
  

   Trenton 
  limestone 
  had 
  been 
  present 
  and 
  subsequently 
  abraded 
  

   (as 
  the 
  Trenton 
  limestone 
  conglomerate 
  bed 
  in 
  the 
  shales 
  might 
  

   suggesrt), 
  can 
  be 
  disregarded 
  on 
  account 
  of 
  the 
  presence 
  of 
  middle 
  

   Trenton 
  fossils 
  in 
  the 
  shales. 
  It 
  has 
  farther 
  been 
  observed 
  by 
  

   Walcott 
  (36) 
  that 
  at 
  Mt 
  Anthony 
  (Rensselaer 
  count}*), 
  where 
  400 
  

   feet 
  of 
  limestone 
  occur, 
  laclurea 
  and 
  M 
  u 
  r 
  c 
  h 
  i 
  s 
  o 
  n 
  i 
  a 
  are 
  

   found 
  •■nearly 
  200 
  feet 
  below 
  the 
  shales''. 
  The 
  Trenton 
  limestone 
  

   could, 
  therefore, 
  at 
  that 
  locality 
  reach 
  200 
  feet 
  at 
  the 
  utmost, 
  

   from 
  which 
  figure, 
  however, 
  are 
  certainly 
  to 
  be 
  subtracted 
  the 
  

   measurements 
  of 
  the 
  Black 
  river, 
  Lowville 
  (Birdseye) 
  and 
  upper 
  

   Chazy 
  limestones, 
  which 
  reduce 
  this 
  figure 
  probably 
  by 
  one 
  half. 
  

   In 
  contrast 
  to 
  this 
  stands 
  the 
  thickness 
  of 
  the 
  Trenton 
  limestone 
  

   in 
  the 
  typical 
  section 
  at 
  Trenton 
  Falls, 
  where 
  though 
  the 
  top 
  

   and 
  bottom 
  of 
  the 
  formation 
  are 
  covered, 
  270 
  feet 
  were 
  obtained 
  

   by 
  Prosser 
  and 
  Cumings's 
  careful 
  measurements 
  (56). 
  It 
  is 
  a 
  

   highly 
  interesting 
  fact 
  that, 
  according 
  to 
  the 
  figures 
  obtained 
  

   by 
  the 
  same 
  investigators, 
  the 
  Trenton 
  limestone 
  gradually 
  thins 
  

   out 
  in 
  approaching 
  the 
  Hudson 
  valley 
  region. 
  At 
  Littlefalls 
  only 
  

   104 
  feet 
  of 
  limestone 
  was 
  found 
  between 
  the 
  Lowville 
  limestone 
  

   and 
  the 
  Utica 
  shale; 
  at 
  Canajoharie 
  and 
  the 
  Flat 
  creek 
  near 
  

   Sprakers 
  only 
  17 
  feet 
  of 
  Trenton 
  limestone; 
  at 
  Tribeshill, 
  40 
  feet; 
  

   along 
  Morphy 
  creek 
  between 
  Cranesville 
  and 
  Amsterdam, 
  ''7 
  

   feet; 
  and 
  opposite 
  Cranesville, 
  21 
  feet; 
  while 
  Walcott 
  reports 
  

   only 
  40 
  feet 
  of 
  Trenton 
  limestone 
  from 
  Saratoga, 
  north 
  of 
  the 
  

   region 
  under 
  consideration. 
  

  

  