﻿332 
  J. 
  Barrell 
  — 
  The 
  Piedmont 
  Terraces 
  

  

  the 
  great 
  importance 
  of 
  disconformities, 
  for 
  which 
  much 
  

   credit 
  should 
  be 
  given 
  to 
  Ulrica, 
  Schuchert, 
  and 
  Grabau. 
  

  

  The 
  first 
  suggestion 
  of 
  a 
  notable 
  extension 
  of 
  the 
  

   shore-line 
  northwest 
  of 
  the 
  present 
  limits 
  of 
  the 
  Atlantic 
  

   Coastal 
  Plain 
  came, 
  strangely 
  enough, 
  not 
  from 
  a 
  stra- 
  

   tigrapher 
  who 
  might 
  be 
  logically 
  credited 
  with 
  a 
  desire 
  

   to 
  extend 
  the 
  former 
  domain 
  of 
  Neptune, 
  but 
  from 
  a 
  

   physiographer, 
  and 
  one 
  who 
  has 
  urged 
  the 
  inadequacy 
  

   of 
  marine 
  denudation 
  to 
  produce 
  extensive 
  baseleveled 
  

   surfaces. 
  

  

  In 
  1890, 
  W. 
  M. 
  Davis 
  published 
  his 
  paper 
  on 
  "The 
  

   rivers 
  of 
  northern 
  New 
  Jersey, 
  with 
  notes 
  on 
  the 
  classi- 
  

   fication 
  of 
  rivers 
  in 
  general." 
  18 
  In 
  this 
  he 
  discussed 
  the 
  

   significance 
  of 
  revived 
  and 
  superposed 
  rivers. 
  In 
  brief, 
  

   the 
  drainage 
  of 
  northern 
  New 
  Jersey 
  is 
  superposed 
  

   across 
  the 
  Watchung 
  trap 
  ridges 
  of 
  the 
  Triassic 
  area 
  and 
  

   across 
  the 
  margin 
  of 
  the 
  adjacent 
  lobe 
  of 
  the 
  Archean 
  

   Highlands. 
  The 
  latter 
  preserve 
  on 
  their 
  flat 
  summits 
  

   remnants 
  of 
  the 
  Schooley 
  peneplain. 
  Davis 
  argued 
  that 
  

   the 
  superposed 
  drainage 
  showed 
  that 
  the 
  Cretaceous 
  

   cover 
  once 
  overlapped 
  the 
  Triassic 
  area, 
  the 
  shore-line 
  

   resting 
  on 
  the 
  margin 
  of 
  the 
  crystalline 
  rocks, 
  and 
  the 
  

   subaerially 
  baseleveled 
  land 
  surface 
  extending 
  beyond. 
  

   This 
  involved 
  an 
  extension 
  of 
  the 
  Cretaceous 
  cover 
  only 
  

   about 
  twenty 
  miles 
  beyond 
  the 
  present 
  outcrop 
  of 
  strata, 
  

   but 
  it 
  was 
  based 
  on 
  definite 
  evidence, 
  that 
  of 
  drainage, 
  

   and 
  was 
  farther 
  than 
  any 
  stratigrapher 
  had 
  ever 
  sug- 
  

   gested 
  extending 
  the 
  Cretaceous 
  sea 
  in 
  this 
  region. 
  In 
  

   a 
  later 
  paper 
  19 
  Davis 
  suggested 
  the 
  existence 
  of 
  a 
  

   former 
  Coastal 
  Plain 
  cover 
  in 
  Connecticut 
  extending 
  

   inland 
  twenty 
  miles 
  from 
  Long 
  Island 
  Sound, 
  his 
  reason- 
  

   ing 
  being 
  similar 
  to 
  that 
  applied 
  to 
  the 
  problem 
  in 
  New 
  

   Jersey, 
  and 
  Schuchert 
  has 
  adopted 
  these 
  limits 
  .as 
  fixing 
  

   the 
  shore 
  of 
  the 
  maximum 
  mid-Cretacic 
  marine 
  invasion. 
  

  

  At 
  the 
  present 
  time, 
  then, 
  the 
  accumulated 
  evidence 
  

   clearly 
  shows 
  that 
  there 
  have 
  been 
  many 
  wide 
  transgres- 
  

   sions 
  and 
  regressions 
  of 
  the 
  sea 
  over 
  the 
  land 
  through- 
  

   out 
  geologic 
  time. 
  An 
  oscillating 
  strand-line, 
  rather 
  

   than 
  a 
  progressively 
  retreating 
  one, 
  represents 
  the 
  

   closest 
  approximation 
  to 
  actual 
  conditions. 
  It 
  is 
  clear, 
  

   also, 
  that 
  many 
  of 
  the 
  transgressions 
  extended 
  much 
  

  

  M 
  Nat. 
  Geogr. 
  Mag., 
  vol. 
  2, 
  pp. 
  81-110, 
  1890. 
  

  

  19 
  The 
  Triassic 
  Formation 
  of 
  Connecticut, 
  TJ. 
  S. 
  G. 
  S., 
  18th 
  Ann. 
  Eept., 
  

   vol. 
  2, 
  1896-97, 
  p. 
  162. 
  

  

  