﻿114 
  II. 
  R. 
  Hice 
  — 
  Inner 
  Gorge 
  Terraces 
  of 
  the 
  

  

  the 
  escarpment 
  of 
  the 
  terrace, 
  and 
  wells 
  have 
  been 
  sunk 
  at 
  

   Beaver, 
  one 
  mile 
  up 
  the 
  stream, 
  that 
  reach 
  river 
  level 
  without 
  

   finding 
  rock. 
  It 
  may 
  be, 
  however, 
  these 
  wells 
  lie 
  in 
  the 
  course 
  

   of 
  the 
  buried 
  channel. 
  

  

  Two 
  hundred 
  yards 
  from 
  the 
  mouth 
  of 
  the 
  Beaver 
  we 
  find 
  

   that 
  stream 
  flowing 
  over 
  the 
  soft 
  shales 
  that 
  overlie 
  the 
  Home- 
  

   wood 
  sandstone. 
  Of 
  the 
  extent 
  of 
  this 
  bench, 
  which 
  here 
  

   lies 
  at 
  stream 
  level, 
  nothing 
  is 
  known. 
  On 
  the 
  eastward 
  a 
  rock 
  

   escarpment 
  cuts 
  it 
  off, 
  to 
  the 
  west 
  it 
  is 
  covered 
  with 
  alluvium. 
  

   Towards 
  the 
  Ohio, 
  it, 
  is 
  cut 
  off 
  by 
  the 
  buried 
  channel 
  of 
  that 
  

   river, 
  and 
  up 
  the 
  Beaver 
  it 
  is 
  covered 
  by 
  the 
  impounded 
  

   waters 
  of 
  that 
  stream. 
  -It' 
  seems 
  most 
  probable, 
  however, 
  that 
  

   it 
  is 
  but 
  a 
  small-* 
  triangular 
  bench, 
  lying 
  between 
  the 
  buried 
  

   channels 
  of 
  the 
  Ohio 
  and 
  Beaver 
  rivers 
  and 
  the 
  rock 
  escarp- 
  

   ment, 
  here 
  rising 
  on 
  the 
  eastern 
  bank 
  of 
  the 
  Beaver. 
  

  

  On 
  the 
  eastern 
  bank 
  of 
  the 
  Beaver, 
  at 
  Rochester, 
  the 
  rock 
  

   is 
  seen 
  passing 
  under 
  the 
  higher 
  portion 
  of 
  the 
  terrace. 
  The 
  

   Rochester 
  terrace 
  is 
  triangular 
  in 
  shape, 
  bounded 
  by 
  the 
  Ohio 
  

   and 
  Beaver 
  rivers 
  on 
  the 
  two 
  sides, 
  and 
  the 
  bounding 
  hill 
  of 
  

   the 
  valley 
  on 
  the 
  northeast. 
  The 
  face 
  of 
  the 
  escarpment 
  

   along 
  the 
  Ohio 
  has 
  been 
  cut 
  by 
  the 
  railroad 
  and 
  no 
  rock 
  is 
  seen. 
  

   It 
  is 
  impossible 
  : 
  herefore 
  to 
  assign 
  any 
  dimensions 
  to 
  the 
  rock 
  

   shelf 
  seen 
  on 
  the 
  Beaver 
  side. 
  

  

  Passing 
  up 
  the 
  Ohio 
  we 
  find 
  a 
  rock 
  bench 
  showing 
  along 
  

   the 
  railroad 
  cut 
  below 
  Baden 
  and 
  extending, 
  almost 
  continu- 
  

   ously, 
  to 
  Legionville. 
  Here 
  the 
  rock 
  shelf 
  is 
  plainly 
  visible, 
  

   and 
  even 
  in 
  a 
  cursory 
  examination 
  it 
  is 
  evident 
  that, 
  measur- 
  

   ing 
  from 
  the 
  bottom 
  of 
  the 
  buried 
  channel, 
  almost 
  the 
  whole 
  

   terrace 
  is 
  rock 
  in 
  place. 
  

  

  The 
  terrace 
  at 
  Economy, 
  extending 
  from 
  Legionville 
  to 
  the 
  

   Allegheny 
  County 
  line, 
  has 
  long 
  been 
  considered 
  entirely 
  

   gravel. 
  Wells 
  have 
  been 
  sunk 
  at 
  the 
  town 
  of 
  Economy 
  to 
  

   river 
  level 
  without 
  finding 
  rock, 
  yet 
  a 
  short 
  distance 
  below 
  the 
  

   town 
  a 
  quarry 
  has 
  been 
  worked, 
  right 
  on 
  the 
  escarpment 
  of 
  

   the 
  inner 
  terrace. 
  Of 
  the 
  extent 
  of 
  the 
  rock 
  shelf 
  we 
  have 
  yet 
  

   no 
  means 
  of 
  knowing. 
  

  

  Returning 
  to 
  the 
  Beaver 
  and 
  passing 
  up 
  that 
  stream, 
  we 
  

   first 
  come 
  to 
  a 
  small 
  rock 
  bench 
  about 
  twenty-five 
  feet 
  above 
  

   stream 
  level, 
  occurring 
  at 
  the 
  mouth 
  of 
  Brady's 
  run. 
  This 
  

   stream 
  at 
  its 
  mouth, 
  is 
  now 
  flowing 
  in 
  a 
  rock 
  channel, 
  while 
  a 
  

   half 
  mile 
  up 
  the 
  stream 
  it 
  has 
  a 
  buried 
  channel 
  fifty 
  feet, 
  or 
  

   more, 
  in 
  depth. 
  The 
  old 
  channel 
  evidently 
  passed 
  into 
  the 
  

   Beaver 
  higher 
  up 
  that 
  stream, 
  and 
  the 
  present 
  channel 
  is 
  a 
  

   post 
  terrace 
  one. 
  

  

  Passing 
  up 
  the 
  Beaver 
  to 
  the 
  upper 
  end 
  of 
  Beaver 
  Falls, 
  we 
  

   reach 
  a 
  point 
  where 
  the 
  Beaver, 
  passing 
  out 
  of 
  the 
  narrow 
  

   gorge 
  in 
  which 
  it 
  is 
  confined 
  for 
  some 
  eleven 
  or 
  twelve 
  miles, 
  

  

  