﻿CANTON 
  FERRY 
  FOSSIL 
  VERTEBRATES 
  — 
  ^WHITE 
  

  

  399 
  

  

  continuous 
  with 
  those 
  of 
  the 
  Pricldey 
  Pear 
  Valley 
  or 
  the 
  Thompson 
  

   Creek 
  area 
  until 
  at 
  least 
  the 
  Middle 
  Miocene 
  times. 
  Also 
  deposition 
  

   was 
  uninterrupted 
  from 
  Lower 
  Oligocene 
  (Pipestone 
  Springs 
  equiva- 
  

   lent) 
  into 
  the 
  Middle 
  Miocene 
  (possibly 
  Marsland 
  equivalent). 
  In 
  

   Late 
  Miocene 
  times 
  orogenic 
  movements 
  tilted 
  the 
  earlier 
  sediments 
  to 
  

   the 
  northeast 
  and 
  coarse 
  gravels, 
  which 
  were 
  later 
  cemented 
  with 
  

   calcium 
  carbonate, 
  were 
  deposited 
  on 
  their 
  truncated 
  edges. 
  As 
  yet 
  

   no 
  identifiable 
  fossils 
  have 
  been 
  found 
  in 
  these 
  gravels, 
  but 
  they 
  are 
  

   believed 
  to 
  be 
  Pliocene 
  in 
  age. 
  The 
  Pleistocene 
  is 
  represented 
  by 
  

   local 
  deposits 
  of 
  coarse, 
  unconsolidated 
  gravels 
  which 
  have 
  not 
  yet 
  

   produced 
  diagnostic 
  fossils. 
  

  

  

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  V, 
  ^^>,: 
  ..;,.. 
  ;rl^^«:^'»^%fe%^«^lk^rS'^^ 
  

  

  

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  *• 
  • 
  

  

  Figure 
  41. 
  — 
  Locality 
  No. 
  24BW18 
  from 
  the 
  south. 
  

  

  The 
  probable 
  conditions 
  under 
  which 
  these 
  sediments 
  were 
  deposited 
  

   are 
  very 
  well 
  described 
  by 
  Douglass 
  (1903, 
  pp. 
  146-149). 
  In 
  summary, 
  

   the 
  sediments 
  accumulated 
  in 
  a 
  deformational 
  basin 
  which, 
  in 
  its 
  lowest 
  

   part, 
  harbored 
  a 
  series 
  of 
  small, 
  very 
  shallow 
  lakes 
  or 
  wet 
  meadows 
  

   or 
  a 
  combination 
  of 
  both. 
  Evidence 
  for 
  the 
  lakes 
  lies 
  in 
  the 
  several 
  

   local 
  areas 
  of 
  fresh-water 
  limestones, 
  some 
  of 
  which 
  show|very 
  fine 
  

   bedding 
  planes. 
  Evidence 
  for 
  the 
  wet 
  meadows 
  lies 
  in 
  the 
  areas 
  of 
  

   dark, 
  gypsiferous 
  clays, 
  often 
  with 
  shalelike 
  partings. 
  However, 
  in 
  

   all 
  probability 
  the 
  gypsum 
  is 
  of 
  secondary 
  development 
  rather 
  than 
  

   piimary. 
  

  

  As 
  pointed 
  out 
  by 
  Douglass 
  (1903, 
  p. 
  147) 
  the 
  fossils 
  occur 
  most 
  

   abundantly 
  near 
  the 
  margin 
  of 
  the 
  depositional 
  basin 
  and 
  are 
  very 
  

  

  