﻿9<D 
  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  the 
  Paleozoic 
  rocks 
  assigned 
  above 
  on 
  this 
  Potsdam 
  would 
  leave 
  

   none 
  of 
  the 
  present 
  peaks 
  projecting 
  above 
  the 
  general 
  level." 
  

   Again 
  he 
  stated: 
  3 
  "This 
  submergence 
  (Utica) 
  apparently 
  com- 
  

   pletely 
  overswept 
  the 
  old 
  Adirondack 
  island, 
  and 
  that 
  for 
  the 
  first 
  

   time 
  in 
  its 
  paleozoic 
  history, 
  with 
  the 
  possible 
  exception 
  of 
  the 
  latter 
  

   part 
  of 
  the 
  Trenton." 
  

  

  Still 
  later 
  the 
  writer, 
  9 
  speaking 
  of 
  the 
  Paleozoic 
  sediments 
  along 
  

   the 
  southwestern 
  border 
  of 
  the 
  Adirondacks, 
  said 
  : 
  " 
  This 
  thick- 
  

   ness 
  (fourteen 
  hundred 
  feet) 
  is 
  great 
  enough 
  so 
  that 
  even 
  after 
  

   allowing 
  for 
  decreased 
  thickness 
  due 
  to 
  overlap 
  and 
  a 
  possibly 
  in- 
  

   creased 
  slope 
  (receiving 
  sediments) 
  as 
  the 
  heart 
  of 
  the 
  Adirondacks 
  

   was 
  approached, 
  we 
  seem 
  to 
  have 
  here 
  a 
  strong 
  argument 
  in 
  favor 
  of 
  

   the 
  submergence 
  of 
  the 
  region 
  for 
  many 
  miles 
  to 
  the 
  east 
  and 
  north- 
  

   east 
  of 
  Port 
  Leyden, 
  so 
  that 
  by 
  the 
  close 
  of 
  the 
  Lower 
  Siluric 
  

   (Ordovicic) 
  the 
  submergence 
  extended 
  to, 
  or 
  close 
  to, 
  the 
  heart 
  of 
  

   the 
  Adirondacks." 
  

  

  This 
  line 
  of 
  reasoning, 
  however, 
  does 
  not 
  regard 
  the 
  possible 
  

   importance 
  of 
  downwarping 
  troughs 
  of 
  deposition. 
  As 
  already 
  

   shown 
  in 
  this 
  paper, 
  such 
  troughs 
  of 
  deposition 
  clearly 
  did 
  exist 
  

   from 
  Potsdam 
  through 
  Trenton 
  time 
  and 
  we 
  have 
  no 
  good 
  reason 
  

   to 
  doubt 
  their 
  existence 
  during 
  Utica 
  and 
  late 
  Ordovicic 
  time 
  as 
  

   well. 
  In 
  a 
  recent 
  paper 
  Cushing 
  4 
  says:- 
  "As 
  the 
  evidence 
  accumu- 
  

   lates 
  it 
  points 
  more 
  and 
  more 
  strongly 
  to 
  deposit 
  in 
  downwarping 
  

   troughs, 
  in 
  which 
  large 
  depth 
  of 
  deposit 
  by 
  no 
  means 
  implies 
  ex- 
  

   tensive 
  overlap 
  on 
  the 
  shores. 
  . 
  . 
  . 
  Even 
  when 
  submerged 
  at 
  the 
  

   same 
  time, 
  as 
  in 
  the 
  Trenton, 
  the 
  deposits 
  on 
  the 
  two 
  sides 
  (east 
  

   and 
  west) 
  are 
  so 
  different 
  both 
  lithologically 
  and 
  faunally, 
  as 
  to 
  

   indicate 
  that 
  the 
  two 
  basins 
  had 
  no 
  very 
  direct 
  connection." 
  

  

  Some 
  years 
  ago 
  Ruedemann, 
  14 
  by 
  noting 
  the 
  parallel 
  positions 
  of 
  

   the 
  graptolites 
  in 
  the 
  black 
  shales 
  at 
  Wells, 
  Dolgeville 
  (Herkimer 
  

   county), 
  along 
  Nine 
  Mile 
  creek 
  near 
  Trenton 
  Falls 
  (Oneida 
  

   county), 
  etc., 
  proved 
  the 
  existence 
  of 
  a 
  late 
  Ordovicic 
  ocean 
  current 
  

   across 
  the 
  southern 
  side 
  of 
  the 
  Adirondack 
  region. 
  The 
  proof 
  for 
  

   the 
  existence 
  of 
  such 
  an 
  ocean 
  current 
  by 
  no 
  means 
  implies 
  that 
  it 
  

   swept 
  entirely 
  across 
  the 
  whole 
  Adirondack 
  region, 
  and 
  hence 
  we 
  

   have 
  here 
  no 
  argument 
  for 
  a 
  complete 
  submergence 
  of 
  the 
  region 
  

   at 
  that 
  time. 
  In 
  fact 
  Ruedemann 
  gives 
  good 
  reason 
  for 
  the 
  belief 
  

  

  3 
  Page 
  285. 
  

  

  4 
  Page 
  144. 
  

   9 
  Page 
  43. 
  

  

  14 
  Pages 
  367-91 
  and 
  15 
  Pages 
  75-81. 
  

  

  