﻿116 
  

  

  jR. 
  R. 
  Hice 
  — 
  Inner 
  Gorge 
  Terraces 
  of 
  the 
  

  

  is 
  due 
  to 
  the 
  character 
  of 
  the 
  strata 
  cut, 
  here 
  being 
  much 
  softer 
  

   than 
  below 
  where 
  the 
  gorge 
  is 
  cut 
  in 
  hard 
  sandstones. 
  

  

  A 
  short 
  distance 
  above 
  Wampum 
  a 
  bench 
  is 
  seen, 
  extending 
  

   some 
  distance, 
  and, 
  crossing 
  the 
  river 
  to 
  Moravia 
  (east 
  side), 
  a 
  

   corresponding 
  bench 
  is 
  seen. 
  The 
  river 
  at 
  this 
  point 
  makes 
  a 
  

   sharp 
  reverse 
  curve, 
  cutting 
  from 
  side 
  to 
  side 
  of 
  the 
  valley, 
  so 
  

   that 
  these 
  two 
  benches 
  are 
  really 
  one, 
  cut 
  across 
  by 
  the 
  river. 
  

   The 
  bench 
  at 
  Moravia 
  reaches 
  well 
  to 
  the 
  confluence 
  of 
  the 
  

   Shenango 
  and 
  Mahoning 
  rivers. 
  

  

  Along 
  the 
  Mahoning 
  river 
  rock 
  in 
  place 
  is 
  frequently 
  seen, 
  

   and 
  some 
  of 
  the 
  inner 
  terraces 
  are 
  undoubtedly 
  of 
  this 
  charac- 
  

   ter. 
  The 
  same 
  is 
  true 
  of 
  the 
  Shenaugo 
  valley, 
  but 
  neither 
  of 
  

   these 
  streams 
  have 
  yet 
  been 
  studied 
  or 
  mapped. 
  

  

  A 
  glance 
  at 
  a 
  map 
  will 
  show 
  we 
  have 
  followed 
  the 
  Ohio 
  

   river 
  from 
  the 
  Ohio 
  and 
  Pennsylvania 
  line 
  to 
  a 
  point 
  but 
  fif- 
  

   teen 
  miles 
  below 
  the 
  confluence 
  of 
  the 
  Allegheny 
  and 
  Monon- 
  

   gahela 
  rivers, 
  a 
  distance 
  of 
  twenty 
  -four 
  miles, 
  and 
  the 
  Beaver 
  

   river 
  its 
  entire 
  length, 
  a 
  distance 
  of 
  twenty-two 
  miles. 
  The 
  

   following 
  table 
  gives 
  the 
  terraces 
  on 
  the 
  rivers 
  studied 
  and 
  the 
  

   occurrences 
  of 
  rock 
  where 
  noted 
  above. 
  The 
  flood 
  plain 
  is 
  not 
  

   given 
  except 
  where 
  underlaid 
  by 
  rock. 
  

  

  On 
  the 
  Ohio. 
  

   Georgetown, 
  south 
  side 
  river, 
  

   Below 
  Industry, 
  north 
  side 
  river, 
  

  

  " 
  " 
  south 
  " 
  

  

  Above 
  " 
  north 
  " 
  

  

  Raccoon 
  Creek, 
  south 
  

   Beaver, 
  north 
  " 
  

  

  Bridgewater, 
  

   Rochester, 
  

   Monaca, 
  

   Baden, 
  

   Aliquippa, 
  

   Economy, 
  

   Shannopin, 
  

  

  On 
  the 
  Beaver. 
  

  

  Brady's 
  run, 
  west 
  side 
  river, 
  

  

  Fallston, 
  " 
  

  

  New 
  Brighton, 
  east 
  " 
  

  

  Beaver 
  Falls 
  (1), 
  west 
  " 
  

  

  " 
  " 
  (2), 
  " 
  " 
  

  

  Eastdale, 
  east 
  " 
  

  

  Homewood, 
  west 
  

  

  Wampum, 
  u 
  " 
  

  

  Moravia, 
  east 
  " 
  

  

  No 
  rock 
  observed. 
  

  

  south 
  

   north 
  

   south 
  

   north 
  

   south 
  

  

  Underlaid 
  by 
  rock. 
  

  

  No 
  rock 
  observed. 
  

   Underlaid 
  by 
  rock. 
  

   No 
  rock 
  observed. 
  

   Underlaid 
  by 
  rock. 
  

   No 
  rock 
  observed. 
  

  

  Underlaid 
  by 
  rock. 
  

   No 
  rock 
  observed. 
  

   Underlaid 
  by 
  rock. 
  

  

  u 
  u 
  

  

  u 
  a 
  

  

  « 
  a 
  

  

  u 
  a 
  

  

  a 
  a 
  

  

  u 
  a 
  

  

  It 
  will 
  be 
  noticed 
  there 
  are 
  twenty-two 
  observed 
  terraces, 
  

   and 
  of 
  these 
  fourteen 
  are 
  underlaid 
  by 
  rock 
  benches, 
  to 
  a 
  

  

  