﻿I38 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  dolomite 
  and 
  limestone 
  formations 
  of 
  the 
  Beekmantown 
  group 
  were 
  

   laid 
  down. 
  These 
  are 
  thickest 
  and 
  most 
  complete 
  in 
  the 
  Champlain 
  

   trough 
  which 
  sagged 
  more, 
  and 
  for 
  a 
  longer 
  time, 
  than 
  the 
  troughs 
  

   on 
  the 
  other 
  three 
  sides 
  of 
  the 
  Adirondacks. 
  But 
  the 
  Beekman- 
  

   town 
  deposits 
  of 
  the 
  Champlain 
  trough 
  do 
  not 
  occur 
  in 
  the 
  Sara- 
  

   toga 
  region, 
  and 
  hence 
  do 
  not 
  especially 
  concern 
  us 
  in 
  this 
  report. 
  

   The 
  Saratoga 
  district 
  is 
  on 
  the 
  western 
  margin 
  of 
  the 
  trough, 
  its 
  

   axis 
  lying 
  to 
  the 
  eastward. 
  The 
  trough 
  was 
  submerged 
  and 
  

   emerged 
  several 
  times. 
  The 
  waters 
  of 
  some 
  of 
  the 
  submergences 
  

   overspread 
  the 
  Saratoga 
  region, 
  as 
  in 
  the 
  case 
  of 
  the 
  Little 
  Falls 
  

   submergence; 
  but 
  the 
  others 
  failed 
  to 
  reach 
  the 
  district. 
  Appar- 
  

   ently 
  the 
  Beekmantown 
  waters 
  fell 
  just 
  short 
  of 
  covering 
  it. 
  It 
  is 
  

   barely 
  possible 
  that 
  the 
  formation 
  was 
  thinly 
  deposited 
  and 
  sub- 
  

   sequently 
  entirely 
  worn 
  away. 
  Beekmantown 
  rocks 
  do 
  not 
  appear 
  

   in 
  the 
  Saratoga 
  section. 
  

  

  Emergence 
  of 
  all 
  troughs 
  followed 
  the 
  Beekmantown, 
  the 
  emer- 
  

   gence 
  being 
  of 
  unknown 
  duration. 
  Then 
  the 
  Champlain 
  trough 
  

   was 
  depressed 
  so 
  that 
  its 
  northern 
  portion 
  passed 
  below 
  sea 
  level 
  

   and 
  the 
  marine 
  limestones 
  of 
  the 
  Chazy 
  group 
  were 
  laid 
  down. 
  

   This 
  depression 
  seems 
  not 
  to 
  have 
  reached 
  within 
  75 
  miles 
  of 
  the 
  

   Saratoga 
  region 
  which 
  remained 
  persistently 
  as 
  an 
  area 
  of 
  lowland 
  

   throughout 
  Beekmantown 
  and 
  Chazy 
  time. 
  

  

  BLACK 
  RIVER 
  HISTORY 
  

  

  Apparently 
  emergence 
  of 
  all 
  troughs 
  followed 
  upon 
  the 
  Chazy 
  

   depression. 
  Because 
  the 
  immediate 
  Saratoga 
  region 
  lacks 
  deposits 
  

   of 
  Beekmantown 
  and 
  Chazy 
  age, 
  these 
  episodes 
  have 
  been 
  de- 
  

   scribed 
  as 
  though 
  each 
  consisted 
  of 
  a 
  single 
  submergence 
  and 
  

   emergence. 
  In 
  reality 
  minor 
  oscillations 
  of 
  level 
  took 
  place 
  within 
  

   both 
  groups. 
  Depression 
  of 
  the 
  troughs, 
  in 
  which 
  the 
  various 
  

   formations 
  of 
  the 
  Black 
  River 
  group 
  were 
  laid 
  down, 
  succeeded 
  

   the 
  Chazy 
  emergence. 
  In 
  order 
  of 
  age 
  the 
  three 
  chief 
  formations 
  

   of 
  the 
  Black 
  River 
  group 
  are 
  the 
  Lowville, 
  the 
  Watertown, 
  and 
  

   the 
  Amsterdam. 
  Only 
  the 
  near 
  shore 
  edges 
  of 
  these 
  formations 
  

   are 
  now 
  exposed 
  to 
  view 
  in 
  New 
  York. 
  They 
  are 
  very 
  patchy 
  

   in 
  distribution 
  and 
  were 
  deposited 
  along 
  the 
  oscillating 
  margins 
  

   of 
  the 
  troughs, 
  now 
  above 
  sea 
  level, 
  now 
  below. 
  The 
  thicker 
  

   deposits 
  of 
  the 
  central 
  portions 
  of 
  the 
  troughs 
  are 
  not 
  shown 
  in 
  

   surface 
  exposures 
  today, 
  but 
  lie 
  farther 
  away 
  from 
  the 
  Adiron- 
  

   dacks, 
  buried 
  under 
  a 
  cover 
  of 
  later 
  rocks. 
  

  

  