﻿HUDSON 
  RIVER 
  BEDS 
  NEAR 
  ALBANY 
  519 
  

  

  zone, 
  and 
  it 
  is 
  possible 
  that 
  it 
  is 
  continuous 
  with 
  similar 
  beds 
  of 
  

   lower 
  Trenton 
  age 
  exposed 
  along 
  the 
  lower 
  Vlaumans 
  kill. 
  Un- 
  

   fortunately 
  no 
  outcrops 
  could 
  be 
  found 
  along 
  the 
  middle 
  and 
  

   upper 
  courses 
  of 
  the 
  Coeymans 
  and 
  Vlaumans 
  kills. 
  

  

  No 
  other 
  exposures 
  of 
  Lorraine 
  beds 
  have 
  been 
  found 
  in 
  the 
  

   investigated 
  area. 
  Their 
  distribution 
  to 
  the 
  northwest, 
  west 
  and 
  

   southwest 
  of 
  Albany 
  is 
  evidence 
  of 
  the 
  restriction 
  of 
  the 
  Lor- 
  

   raine 
  beds 
  to 
  the 
  western 
  part 
  of 
  the 
  area. 
  

  

  Prof. 
  Prosser 
  has 
  lately 
  separated 
  the 
  Utica 
  and 
  Lorraine 
  

   shales 
  of 
  the 
  lower 
  Mohawk 
  valley 
  by 
  testing 
  them 
  with 
  HC1, 
  

   with 
  which 
  reagent 
  the 
  calcareous 
  Utica 
  shale 
  will 
  strongly 
  ef- 
  

   fervesce, 
  while 
  the 
  Lorraine 
  shale 
  does 
  not 
  react. 
  This 
  test 
  had 
  

   not 
  suggested 
  itself 
  to 
  the 
  writer 
  when 
  in 
  the 
  field; 
  but, 
  on 
  later 
  

   application 
  to 
  the 
  shales 
  of 
  the 
  various 
  terranes,of 
  the 
  Hudson 
  

   valley 
  region 
  near 
  Albany, 
  it 
  was 
  found 
  to 
  fail 
  in 
  the 
  clastic 
  

   rocks 
  of 
  this 
  region, 
  where 
  even 
  the 
  Trenton 
  is 
  represented 
  by 
  

   argillaceous 
  shales, 
  and 
  among 
  the 
  Utica 
  shales 
  only 
  those 
  from 
  

   the 
  penitentiary 
  at 
  Albany 
  were 
  found 
  to 
  effervesce, 
  while 
  all 
  

   specimens 
  of 
  Utica 
  shale 
  from 
  various 
  localities 
  of 
  the 
  Mohawk 
  

   valley 
  subjected 
  to 
  this 
  test 
  by 
  the 
  writer 
  have 
  strongly 
  reacted. 
  

   This 
  indicates 
  the 
  great 
  change 
  in 
  the 
  marine 
  conditions 
  from 
  

   west 
  to 
  east 
  in 
  this 
  region 
  throughout 
  a 
  long 
  period. 
  

  

  B 
  - 
  UTICA 
  BEDS 
  

  

  East 
  of 
  this 
  area 
  of 
  Lorraine 
  rocks, 
  the 
  presence 
  of 
  a 
  zone 
  of 
  

   Utica 
  shale 
  extending 
  in 
  the 
  direction 
  of 
  the 
  general 
  strike 
  of 
  

   the 
  shales 
  of 
  the 
  Hudson 
  river 
  valley, 
  has 
  been 
  established 
  by 
  

   the 
  finding 
  of 
  15 
  outcrops 
  which 
  contain 
  Utica 
  shale 
  fossils 
  (Com- 
  

   pare 
  the 
  accompanying 
  map). 
  

  

  Station 
  5. 
  Mechanicsville 
  

  

  The 
  excavation 
  of 
  a 
  large 
  spillway 
  for 
  the 
  establishment 
  of 
  the 
  

   Hudson 
  light 
  and 
  power 
  company 
  of 
  Mechanicsville, 
  on 
  the 
  Hud- 
  

   son, 
  about 
  2 
  miles 
  below 
  Mechanicsville, 
  offered 
  a 
  rare 
  opportunity 
  

   for 
  collecting 
  in 
  the 
  shale. 
  Though 
  this 
  locality 
  lies 
  several 
  miles 
  

   north 
  of 
  the 
  boundary 
  of 
  the 
  area 
  investigated 
  thus 
  far, 
  it 
  was 
  

   thought 
  expedient 
  to 
  include 
  its 
  description 
  in 
  this 
  paper, 
  as 
  the 
  

  

  