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  GEOLOGICAL 
  MEMOIRS. 
  

  

  classification 
  ; 
  but 
  it 
  is, 
  on 
  the 
  other 
  hand, 
  equally 
  antagonistic 
  to 
  

   Sir 
  Charles's 
  newer 
  classification 
  of 
  the 
  English 
  Tertiary 
  beds. 
  

  

  The 
  parallelism 
  of 
  the 
  Calcaire 
  de 
  la 
  Beauce 
  with 
  the 
  Upper 
  Oligo- 
  

   cene 
  cannot 
  be 
  determined 
  with 
  the 
  same 
  certainty 
  as 
  that 
  of 
  the 
  

   Paris 
  Gypsum 
  with 
  the 
  Lower 
  Oligocene. 
  The 
  fauna 
  of 
  the 
  Stern- 
  

   berger 
  Gestein 
  has 
  so 
  distinct 
  an 
  Oligocene 
  fades, 
  that 
  M. 
  Deshayes 
  

   referred 
  all 
  the 
  beds 
  of 
  that 
  period 
  (Cassel, 
  Biinde, 
  and 
  Osnabriick) 
  

   to 
  the 
  horizon 
  of 
  the 
  Eontainebleau 
  Sands. 
  On 
  the 
  other 
  hand, 
  

   however, 
  so 
  many 
  forms 
  belonging 
  to 
  newer 
  faunas 
  occur 
  in 
  these 
  

   beds, 
  that 
  German 
  authors, 
  laying 
  too 
  much 
  weight 
  upon 
  the 
  latter, 
  

   have 
  assigned 
  to 
  the 
  Sternberger 
  Gestein 
  much 
  too 
  high 
  a 
  position, 
  

   some 
  having 
  considered 
  it 
  to 
  be 
  of 
  even 
  Pliocene 
  age. 
  Prof. 
  Beyrich, 
  

   from 
  a 
  number 
  of 
  considerations, 
  comes 
  to 
  the 
  conclusion 
  that 
  the 
  

   formation 
  in 
  question 
  occupies 
  a 
  position 
  intermediate 
  between 
  that 
  

   of 
  the 
  youngest 
  Belgian 
  Oligocene 
  beds 
  and 
  that 
  of 
  the 
  Newer 
  Ter- 
  

   tiary 
  strata 
  of 
  the 
  period 
  of 
  the 
  Shell-beds 
  of 
  Touraine. 
  In 
  England 
  

   and 
  Belgium 
  strata 
  of 
  this 
  age 
  do 
  not 
  occur, 
  and 
  their 
  intermediate 
  

   position, 
  just 
  defined, 
  is 
  the 
  only 
  certain 
  ground 
  for 
  considering 
  that 
  

   they 
  are 
  probably 
  the 
  equivalents 
  in 
  time 
  of 
  the 
  Calcaire 
  de 
  la 
  Beauce. 
  

   On 
  account 
  of 
  their 
  geographical 
  distribution, 
  it 
  appears 
  more 
  natural 
  

   to 
  consider 
  them 
  the 
  youngest 
  member 
  of 
  the 
  Oligocene 
  period 
  than 
  

   the 
  oldest 
  of 
  the 
  Miocene. 
  

  

  The 
  following 
  Table 
  may 
  be 
  of 
  assistance 
  in 
  reading 
  the 
  foregoing 
  

   Memoir, 
  although 
  it 
  does 
  not 
  represent 
  all 
  the 
  minor 
  differences 
  in 
  

   the 
  ages 
  of 
  the 
  individual 
  beds. 
  

  

  Table 
  showing 
  the 
  Correlation 
  of 
  the 
  Oligocene 
  Beds 
  of 
  Belgium 
  and 
  

   Germany 
  with 
  those 
  of 
  England, 
  France, 
  and 
  Switzerland. 
  

  

  Districts. 
  

  

  Isle 
  of 
  Wight 
  

   Paris 
  Basin 
  .. 
  

  

  Belgium 
  , 
  

  

  North 
  Germany 
  

  

  Mayence 
  Basin 
  , 
  

   Switzerland 
  

  

  Upper 
  

   Oligocene. 
  

  

  Calcaire 
  

   Beauce. 
  

  

  de 
  la 
  

  

  Lim 
  

   Lyell 
  

  

  b. 
  Upper 
  

   burg 
  of 
  

   (Clay 
  of 
  Boom 
  

   &c.) 
  ; 
  Eupelien 
  

   of 
  Dumont. 
  

  

  a. 
  Sternberger 
  

   Gestein 
  of 
  Cas- 
  

   sel, 
  Biinde, 
  and 
  

   Osnabriick. 
  

  

  b. 
  Hermsdorf 
  

   Clay. 
  

  

  Middle. 
  

   Oligocene. 
  

  

  Lower. 
  

   Oligocene. 
  

  

  {Bembridgebeds? 
  

   Osborne 
  and 
  

   Headon 
  beds. 
  

   J 
  Gypsum 
  of 
  

   L 
  Montmartre. 
  

   f 
  Lower 
  Limburg 
  

   of 
  Lyell 
  (Le- 
  

   of 
  Lyell 
  ; 
  Ton- 
  ! 
  thensands,&c); 
  

   Tongrien 
  in- 
  

   ferieur 
  of 
  Du- 
  

   ^ 
  mont. 
  

  

  Hempstead 
  beds. 
  

  

  f 
  Fontainebleau 
  

   \ 
  Sands. 
  

  

  Middle 
  Limburg 
  

  

  grien 
  superieur 
  

   of 
  Dumont. 
  

  

  Brackish 
  and 
  

   y 
  freshwater 
  beds 
  

   of 
  Cassel. 
  

  

  Egeln 
  marine 
  

   beds, 
  and 
  un- 
  

   der 
  ly 
  in 
  gBrown 
  

   Coal. 
  

  

  Brown 
  Coal, 
  Alzey 
  I 
  

   marine 
  beds, 
  and 
  [ 
  

   intervening 
  strata. 
  1 
  

  

  Marine 
  beds 
  of 
  Balei 
  

   and 
  Delsberg. 
  

  

  {Freshwater 
  beds 
  

   near 
  Delsberg. 
  

  

  [H. 
  M. 
  J.] 
  

  

  