﻿GEOLOGIC 
  FORMATIONS 
  OF 
  NEW 
  YOJSK 
  151 
  

  

  Generally 
  speaking, 
  the 
  lowest 
  of 
  these 
  groups 
  lies 
  conform- 
  

   ably 
  upon 
  the 
  strata 
  of 
  the 
  Hudson 
  river 
  group, 
  — 
  ^the 
  uppermost 
  

   of 
  the 
  Lower 
  Silurian, 
  — 
  though 
  in 
  eastern 
  Albany 
  county 
  the 
  

   Hudson 
  river 
  shales 
  are 
  much 
  disturbed. 
  

  

  In 
  regard 
  to 
  this 
  relation 
  it 
  has 
  been 
  said 
  by 
  Dana": 
  ^ 
  Cases 
  

   of 
  intervening 
  erosion 
  may 
  be 
  found, 
  for 
  every 
  period 
  loses 
  by 
  

   erosion 
  a 
  large 
  part 
  of 
  its 
  deposition 
  in 
  the 
  supply 
  of 
  material 
  

   for 
  the 
  beds 
  of 
  the 
  following 
  period/ 
  

  

  Oneida 
  Conglomerate 
  

  

  The 
  Hudson 
  river 
  group 
  is 
  covered 
  in 
  many 
  places 
  by 
  a 
  bed 
  

   of 
  conglomerate 
  consisting 
  chiefly 
  of 
  coarse 
  sand 
  and 
  rounded 
  

   pebbles 
  of 
  quartz, 
  cemented 
  together 
  into 
  a 
  firm 
  mass. 
  Being 
  

   well 
  developed 
  in 
  Oneida 
  county 
  south 
  of 
  Utica, 
  it 
  has 
  received 
  

   its 
  name 
  frora 
  that 
  of 
  the 
  county. 
  

  

  It 
  is 
  the 
  base 
  of 
  the 
  Lower 
  Silurian 
  system. 
  In 
  central 
  New 
  

   York 
  it 
  is 
  but 
  a 
  few 
  feet 
  in 
  thickness, 
  and 
  indeed 
  seems 
  to 
  be 
  

   entirely 
  wanting 
  in 
  many 
  places; 
  but 
  in 
  the 
  lower 
  Hudson 
  val- 
  

   ley 
  it 
  swells 
  to 
  a 
  thickness 
  of 
  several 
  hundred 
  feet 
  and 
  south- 
  

   west 
  of 
  Eondout 
  forms 
  the 
  Shawangunk 
  mountain 
  from 
  which 
  

   it 
  receives 
  the 
  name 
  of 
  Shawangunk 
  grit. 
  From 
  this 
  place 
  its 
  

   upheaved 
  edges 
  may 
  be 
  traced 
  in 
  the 
  range 
  of 
  hills 
  southeast 
  

   of 
  the 
  Delaware 
  and 
  Hudson 
  canal 
  and 
  parallel 
  to 
  it, 
  and 
  the 
  

   siame 
  rock 
  forms 
  most 
  of 
  the 
  mountain 
  range 
  of 
  the 
  Kittatinny 
  

   or 
  ]:>lue 
  Eidge, 
  along 
  which 
  the 
  Delaware 
  flows 
  from 
  Port 
  Jervis, 
  

   where 
  it 
  leaves 
  New 
  York, 
  to 
  the 
  famous 
  Delaware 
  Water 
  Gap 
  

   where 
  it 
  cuts 
  through 
  the 
  barrier. 
  From 
  this 
  point, 
  its 
  edge 
  

   ranges 
  southward 
  to 
  Virginia. 
  No 
  fossils 
  have 
  yet 
  been 
  dis- 
  

   covered 
  in 
  it: 
  indeed 
  the 
  rolled 
  and 
  worn 
  condition 
  of 
  its 
  ma- 
  

   terials 
  would 
  indicate 
  that 
  it 
  was 
  formed 
  under 
  agitated 
  waters, 
  

   which 
  did 
  not 
  allow 
  the 
  growth 
  or 
  preservation 
  of 
  organic 
  

   forms. 
  ■ 
  

  

  The 
  well 
  known 
  summer 
  resort 
  of 
  Lake 
  Mohonk 
  is 
  on 
  the 
  

   Shawangunk 
  grit. 
  

  

  The 
  ' 
  Eensselaer 
  plateau,' 
  in 
  Eensselaer 
  county, 
  is 
  an 
  ex- 
  

   tensive 
  outcrop 
  of 
  greenish 
  conglomerate, 
  resting 
  conformably 
  

  

  a 
  Man. 
  Geol. 
  pp. 
  xxx 
  

  

  