﻿82 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  has 
  argued 
  that 
  the 
  major 
  relief 
  features 
  immediately 
  prior 
  to 
  

   the 
  advent 
  of 
  the 
  Potsdam 
  sea 
  were 
  valleys 
  carved 
  out 
  along 
  

   the 
  belts 
  of 
  weaker 
  Grenville 
  strata, 
  especially 
  the 
  limestones. 
  

  

  Positive 
  evidence 
  regarding 
  the 
  physiographic 
  condition 
  of 
  the 
  

   interior 
  Adirondack 
  region 
  during 
  Cambric 
  time 
  is 
  of 
  course 
  

   lacking, 
  but 
  there 
  is 
  no 
  reason 
  whatever 
  for 
  thinking 
  that 
  it 
  was 
  

   essentially 
  different 
  from 
  the 
  immediately 
  surrounding 
  regions 
  

   except 
  probably 
  that 
  the 
  general 
  altitude 
  was 
  somewhat 
  greater. 
  

  

  Encroachment 
  of 
  the 
  late 
  Cambric 
  sea. 
  Cushing 
  3 
  has 
  proved 
  

   that 
  the 
  Potsdam 
  sea 
  encroachd 
  upon 
  the 
  Adirondack 
  region 
  

   from 
  the 
  northeast 
  toward 
  the 
  southwest 
  because 
  the 
  sandstone 
  

   formation 
  of 
  that 
  age 
  progressively 
  thins 
  from 
  a 
  thickness 
  of 
  

   over 
  one 
  thousand 
  feet 
  to 
  disappearance 
  in 
  the 
  southwest. 
  Dur- 
  

   ing 
  the 
  encroachment 
  of 
  this 
  late 
  Cambric 
  sea, 
  did 
  the 
  waters 
  

   enter 
  distinct 
  embayments 
  or 
  estuaries 
  as 
  Kemp 
  6 
  has 
  suggested 
  

   or 
  did 
  they 
  form 
  a 
  more 
  regular 
  shore 
  line? 
  Along 
  the 
  eastern 
  

   side, 
  where 
  the 
  topography 
  was 
  moderately 
  rugged, 
  such 
  embay- 
  

   ments 
  were 
  quite 
  likely 
  physiographic 
  features 
  of 
  some 
  impor- 
  

   tance 
  due 
  to 
  a 
  drowning 
  of 
  the 
  valleys 
  which 
  had 
  been 
  cut 
  out 
  

   along 
  the 
  belts 
  of 
  weaker 
  Grenville 
  strata. 
  In 
  the 
  southern 
  

   Adirondacks, 
  however, 
  the 
  evidence 
  is 
  decidedly 
  against 
  the 
  en- 
  

   croachment 
  of 
  the 
  late 
  Cambric 
  sea 
  by 
  setting 
  up 
  anything 
  like 
  

   well-defined 
  embayments 
  or 
  estuaries 
  extending 
  into 
  the 
  area 
  of 
  

   Precambric 
  rock. 
  

  

  The 
  outliers 
  of 
  Palezoic 
  rock 
  in 
  the 
  southeastern 
  Adirondacks 
  

   are 
  of 
  first 
  importance 
  in 
  this 
  connection. 
  All 
  the 
  definitely 
  

   known 
  outliers 
  well 
  within 
  the 
  Precambric 
  rock 
  area 
  of 
  this 
  

   region 
  are 
  given 
  in 
  the 
  following 
  list 
  : 
  

  

  i 
  A 
  small 
  exposure 
  of 
  Potsdam 
  sandstone 
  near 
  the 
  south- 
  

   western 
  corner 
  of 
  the 
  Elizabethtown 
  quadrangle 
  and 
  near 
  the 
  

   village 
  of 
  North 
  Hudson. 
  

  

  2, 
  3, 
  4 
  Three 
  outliers 
  of 
  Potsdam 
  sandstone 
  along 
  the 
  eastern 
  

   side 
  of 
  the 
  Paradox 
  Lake 
  quadrangle. 
  

  

  5 
  The 
  Little 
  Falls 
  dolomite 
  outlier 
  (probably 
  with 
  underlying 
  

   Potsdam) 
  at 
  Schroon 
  Lake 
  village, 
  Schroon 
  Lake 
  quadrangle. 
  

  

  6 
  A 
  small 
  outlier 
  of 
  Potsdam 
  sandstone 
  one 
  and 
  one-half 
  

   miles 
  west 
  of 
  the 
  village 
  of 
  North 
  River 
  in 
  the 
  northeastern 
  

   corner 
  of 
  the 
  Thirteenth 
  Lake 
  quadrangle. 
  

  

  Pages 
  279-80. 
  

   Pages 
  408-12. 
  

  

  