﻿Report 
  of 
  tee 
  State 
  Geologist. 
  615 
  

  

  constitute 
  a 
  limited 
  but 
  characteristic 
  fauna. 
  This 
  member 
  

   appears 
  to 
  have 
  a 
  thickness 
  of 
  about 
  fifteen 
  feet 
  in 
  the 
  Mohawk 
  

   valley. 
  There 
  is 
  an 
  excellent 
  exposure 
  in 
  the 
  lower 
  quarries 
  at 
  

   Tribes 
  Hill 
  along 
  the 
  railroad, 
  about 
  300 
  yards 
  east 
  of 
  the 
  station. 
  

   Here 
  the 
  basal 
  member 
  is 
  a 
  three-foot 
  bed 
  of 
  dense, 
  dark-gray 
  

   limestone, 
  with 
  only 
  a 
  moderate 
  amount 
  of 
  interbedded 
  streak- 
  

   ings 
  of 
  the 
  dark, 
  coarse 
  sand, 
  and 
  its 
  aspect 
  is 
  mainly 
  typical 
  

   Calciferous. 
  Above 
  this 
  there 
  are 
  three 
  and 
  a 
  half 
  feet 
  of 
  

   lighter 
  colored 
  similar 
  limestones, 
  with 
  only 
  occasional 
  interstreak- 
  

   ings 
  of 
  " 
  f 
  ucoidal 
  " 
  character. 
  Then 
  there 
  are 
  ten 
  feet 
  of 
  very 
  

   massive, 
  dark 
  limestones 
  of 
  alternating 
  dense 
  birdseye 
  like 
  lime- 
  

   stone 
  and 
  coarse, 
  sandy 
  " 
  f 
  ucoidal 
  "-like 
  beds. 
  This 
  series 
  

   weathers 
  very 
  light. 
  Above 
  are 
  eight 
  feet 
  of 
  massive 
  beds 
  with 
  

   some 
  "fucoidal" 
  features, 
  but 
  in 
  greater 
  part 
  of 
  Calciferous 
  

   type. 
  These 
  merge 
  upward 
  into 
  ten 
  feet 
  of 
  Calciferous 
  sand- 
  

   rock, 
  very 
  arenaceous 
  but 
  quite 
  soft, 
  in 
  beds 
  of 
  eighteen 
  to 
  

   twenty-four 
  inches, 
  which 
  constitute 
  the 
  surface 
  of 
  the 
  top 
  of 
  the 
  

   exposure. 
  

  

  At 
  Canajoharie 
  the 
  quarrying 
  operations 
  have 
  been 
  extensive 
  

   in 
  the 
  " 
  fucoidal 
  " 
  beds. 
  Yanuxem* 
  has 
  described 
  the 
  members 
  

   at 
  this 
  locality 
  in 
  considerable 
  detail. 
  They 
  have 
  a 
  thickness 
  of 
  

   about 
  ten 
  feet 
  and 
  lie 
  about 
  six 
  feet 
  below 
  the 
  top 
  of 
  the 
  formation. 
  

  

  The 
  " 
  fucoidal 
  " 
  member 
  is 
  to 
  be 
  seen 
  at 
  many 
  points 
  about 
  

   Amsterdam 
  in 
  the 
  quarries 
  along 
  the 
  river 
  and 
  behind 
  the 
  town 
  

   and 
  in 
  various 
  stream 
  cuts, 
  including 
  those 
  on 
  the 
  opposite 
  side 
  

   of 
  the 
  river. 
  

  

  At 
  Little 
  Falls 
  the 
  thickness 
  is 
  greatly 
  diminished, 
  and 
  

   Yanuxem 
  states 
  that 
  he 
  has 
  observed 
  fucoidal 
  members 
  at 
  

   various 
  points 
  in 
  Fulton 
  county, 
  where 
  the 
  distinctive 
  characters 
  

   are 
  presented, 
  but 
  the 
  thickness 
  is 
  slight. 
  I 
  observed 
  an 
  excel- 
  

   lent 
  exposure 
  of 
  this 
  member 
  and 
  its 
  associates 
  in 
  Washington 
  

   county 
  in 
  a 
  stream 
  bed 
  at 
  a 
  point 
  five 
  miles 
  due 
  east 
  of 
  Glens 
  

   Falls, 
  where 
  it 
  has 
  a 
  thickness 
  of 
  one 
  foot. 
  The 
  bed 
  lies 
  on 
  

   typical 
  Calciferous 
  sandstone 
  and 
  is 
  overlaid 
  by 
  a 
  two 
  foot 
  bed 
  

   of 
  dark 
  blue, 
  very 
  compact 
  limestone, 
  probably 
  of 
  Chazy 
  age. 
  

  

  As 
  to 
  the 
  existence 
  of 
  the 
  Chazy 
  formation 
  in 
  the 
  Mohawk 
  

   valley 
  I 
  have 
  no 
  new 
  evidence 
  to 
  present. 
  Walcottf 
  states 
  that 
  

   at 
  Little 
  Falls 
  and 
  Fort 
  Plain 
  it 
  is 
  absent. 
  > 
  

  

  * 
  Loc. 
  cit. 
  p. 
  37. 
  t 
  Loc. 
  cit. 
  p. 
  33. 
  

  

  