﻿Hay 
  — 
  Ages 
  of 
  Pleistocene 
  Deposits. 
  367 
  

  

  of 
  Columbia 
  furnish 
  a 
  standard 
  for 
  the 
  number 
  and 
  

   names 
  of 
  terraces, 
  Sunderland, 
  "Wicomico, 
  and 
  Talbot. 
  

   Here, 
  as 
  in 
  North 
  Carolina, 
  Elephas 
  columbi 
  and 
  E. 
  

   primi 
  genius 
  and 
  mastodon 
  occur, 
  but 
  they 
  do 
  not 
  help 
  

   us 
  in 
  deciding 
  the 
  age 
  of 
  the 
  formations. 
  In 
  Charles 
  

   county, 
  near 
  Patuxent 
  river, 
  Cope 
  found 
  two 
  extinct 
  

   vertebrates, 
  Grison 
  macrodon 
  and 
  supposed 
  Tagassu 
  

   lenis. 
  The 
  latter 
  occurs 
  at 
  Vero, 
  Florida, 
  and 
  Charleston, 
  

   South 
  Carolina; 
  also 
  in 
  Wythe 
  county, 
  Virginia, 
  with 
  

   many 
  extinct 
  species 
  ; 
  but 
  possibly 
  also 
  in 
  post- 
  Wiscon- 
  

   sin 
  at 
  Galena, 
  Illinois. 
  At 
  Marshall 
  Hall, 
  15 
  miles 
  below 
  

   Washington, 
  Equus 
  leidyi 
  was 
  discovered 
  many 
  years 
  

   ago, 
  in 
  supposed 
  Talbot 
  deposits. 
  Long 
  ago 
  horse 
  

   remains 
  were 
  found 
  near 
  Georgetown, 
  now 
  a 
  part 
  of 
  

   Washington, 
  during 
  the 
  construction 
  of 
  the 
  Chesapeake 
  

   and 
  Potomac 
  canal. 
  Near 
  Mitchellville, 
  Prince 
  George's 
  

   county, 
  teeth 
  of 
  an 
  extinct 
  horse 
  have 
  been 
  discovered 
  in 
  

   Tertiary 
  materials 
  evidently 
  reworked 
  during 
  the 
  Pleis- 
  

   tocene. 
  A 
  horse, 
  probably 
  Equus 
  leidyi, 
  has 
  been 
  met 
  

   with 
  at 
  Chesapeake 
  beach. 
  In 
  the 
  eastern 
  peninsula 
  

   some 
  vertebrates 
  not 
  characteristic 
  of 
  any 
  special 
  forma- 
  

   tion 
  have 
  been 
  discovered 
  at 
  Oxford 
  Neck, 
  and 
  in 
  Queen 
  

   Anne's 
  county, 
  both 
  localities 
  not 
  far 
  from 
  Chesapeake 
  

   bay. 
  No 
  Pleistocene 
  vertebrates 
  are 
  known 
  to 
  have 
  been 
  

   met 
  with 
  in 
  the 
  eastern 
  half 
  of 
  this 
  peninsula 
  or 
  in 
  the 
  

   State 
  of 
  Delaware. 
  

  

  In 
  New 
  Jersey 
  three 
  formations 
  are 
  recognized 
  alike 
  

   by 
  the 
  State 
  Survey 
  and 
  by 
  the 
  Maryland 
  geologists 
  ; 
  

   but 
  the 
  local 
  deposits 
  are 
  often 
  differently 
  identified 
  by 
  

   the 
  two 
  schools. 
  If 
  a 
  line 
  be 
  drawn 
  from 
  Salem, 
  Salem 
  

   county, 
  near 
  Delaware 
  river, 
  to 
  Long 
  Branch, 
  on 
  the 
  

   Atlantic, 
  it 
  will 
  mark 
  pretty 
  accurately 
  the 
  outcrop 
  of 
  

   the 
  Cretaceous. 
  Nearly 
  all 
  of 
  New 
  Jersey 
  southeast 
  of 
  

   this 
  line, 
  comprising 
  nearly 
  one-half 
  of 
  the 
  State, 
  is 
  

   occupied 
  by 
  the 
  Cohansey 
  sands, 
  overlain 
  to 
  a 
  consider- 
  

   able 
  extent 
  by 
  deposits 
  belonging 
  to 
  the 
  Cape 
  May 
  forma- 
  

   tion. 
  Now 
  it 
  is 
  a 
  fact, 
  the 
  significance 
  of 
  which 
  is 
  not 
  

   understood, 
  that 
  nowhere 
  in 
  this 
  area 
  of 
  Cohansey 
  sands 
  

   have 
  any 
  Pleistocene 
  vertebrate 
  fossils 
  been 
  found, 
  while 
  

   close 
  alone 
  the 
  line 
  indicated 
  arid 
  north 
  of 
  it 
  they 
  are 
  not 
  

   uncommon. 
  At 
  nine 
  or 
  ten 
  different 
  localities 
  along 
  the 
  

   Cretaceous 
  outcrop 
  mastodons 
  have 
  been 
  met 
  with. 
  

   These 
  do 
  not 
  help 
  us 
  much 
  on 
  the 
  question 
  of 
  the 
  > 
  age 
  of 
  

   the 
  deposits 
  containing 
  them, 
  and 
  there 
  are 
  few 
  other 
  

  

  