﻿6o 
  

  

  NEW 
  YORK 
  STATE 
  MUSEUM 
  

  

  When 
  the 
  waters 
  north 
  of 
  the 
  escarpment 
  had 
  subsided 
  to 
  the 
  

   level 
  of 
  the 
  outlet 
  at 
  Rome, 
  a 
  long 
  period 
  of 
  stability 
  ensued, 
  during 
  

   which 
  extensive 
  and 
  well 
  marked 
  beaches 
  were 
  formed 
  by 
  the 
  waves. 
  

   This 
  comparatively 
  long-lived 
  body 
  of 
  water 
  has 
  been 
  named 
  Lake 
  

   Iroquois, 
  and 
  its 
  outline 
  is 
  shown 
  in 
  the 
  accompanying 
  map 
  (fig. 
  

   lo) 
  reproduced 
  from 
  Gilbert's 
  History 
  of 
  the 
  Niagara 
  river. 
  The 
  

   Iroquois 
  shore 
  lines 
  in 
  this 
  region 
  may 
  be 
  seen 
  in 
  the 
  ridge 
  road 
  

   which 
  extends 
  eastward 
  from 
  Lewiston, 
  and 
  westward 
  from 
  

   Queenston, 
  closely 
  skirting 
  the 
  foot 
  of 
  the 
  escarpment. 
  

  

  Fig. 
  10 
  Map 
  of 
  Lake 
  Iroquois 
  ; 
  the 
  modern 
  hydrography 
  shown 
  in 
  dotted 
  lines. 
  (After 
  Gilbert) 
  

  

  A 
  fine 
  section 
  of 
  this 
  old 
  beach 
  is 
  seen 
  just 
  behind 
  the 
  railroad 
  

   station 
  at 
  Lewiston. 
  Here 
  the 
  layers 
  of 
  sand 
  and 
  gravel 
  slope 
  

   steepl} 
  ioward 
  the 
  southeast, 
  and 
  many 
  of 
  them 
  are 
  irregular 
  and 
  

   wedge-shaped. 
  Some 
  of 
  the 
  beds, 
  a 
  foot 
  or 
  more 
  in 
  thickness, 
  con- 
  

   sist 
  entirely 
  of 
  rounded 
  pebbles, 
  with 
  little 
  or 
  no 
  sand 
  between, 
  form- 
  

   ing 
  a 
  porous 
  mass 
  of 
  '' 
  loose 
  gravel 
  ". 
  The 
  prevailing 
  rock 
  of 
  the 
  

   pebbles 
  is 
  the 
  Medina 
  sandstone, 
  derived 
  from 
  the 
  neighborhood, 
  

   and 
  the 
  pebbles 
  are 
  always 
  well 
  waterworn, 
  and 
  commonly 
  of 
  the 
  

   flattened 
  type 
  characteristic 
  of 
  thin 
  bedded 
  rocks. 
  Mingled 
  with 
  

   the 
  beds 
  of 
  coarse 
  material 
  are 
  layers 
  of 
  fine 
  sand, 
  the 
  structure 
  of 
  

   which 
  is 
  well 
  brought 
  out 
  by 
  exposure 
  to 
  wind 
  and 
  weather. 
  Not 
  

  

  