﻿1863.] 
  

  

  VON" 
  KCENEN 
  OLIGOCENE 
  DEPOSITS. 
  

  

  101 
  

  

  No. 
  

  

  44. 
  

   45. 
  

  

  46. 
  

   47. 
  

   48. 
  

   49. 
  

   50. 
  

  

  151. 
  

   52. 
  

   53. 
  

   54. 
  

   55. 
  

   56. 
  

  

  Bivalves 
  — 
  {continued). 
  

  

  Barton 
  

   Clay. 
  

  

  Diplodonta 
  dilatata 
  ? 
  , 
  Sow 
  

  

  Fistulana 
  Heyseana 
  ? 
  , 
  Phil. 
  

  

  Isocardia 
  transversa 
  ? 
  , 
  Nyst, 
  var 
  

  

  Lucina 
  Menardii?, 
  Desk., 
  var 
  

  

  Modiola 
  Nystii, 
  Kickx 
  

  

  Nucula 
  similis 
  ? 
  , 
  Sow., 
  var 
  

  

  Ostrea 
  ventilabrum, 
  Goldf. 
  (0. 
  prona, 
  S. 
  

  

  Wood) 
  

  

  Panopasa 
  corrugata 
  ? 
  , 
  Sow 
  

  

  Pecten 
  bellicostatus, 
  S. 
  Wood 
  

  

  Pholas, 
  n. 
  sp. 
  

  

  Psammo 
  bia 
  compressa, 
  Sow 
  

  

  Tellina 
  

  

  Teredo 
  antenautag 
  ? 
  , 
  Sow 
  

  

  Oligocene 
  of 
  Germany 
  . 
  

  

  Lower. 
  

  

  Middle. 
  

  

  Of 
  these 
  56 
  species, 
  43 
  exist 
  in 
  the 
  Lower 
  Oligocene 
  of 
  Germany, 
  

   and 
  6 
  are 
  peculiar 
  to 
  the 
  English 
  Brockenhurst 
  and 
  Headon 
  beds 
  ; 
  

   21 
  of 
  them 
  are 
  found 
  also 
  in 
  the 
  Upper 
  Eocene, 
  and 
  4 
  pass 
  over 
  to 
  

   the 
  Middle 
  Oligocene 
  of 
  Germany 
  ; 
  23 
  of 
  these 
  species 
  are 
  character- 
  

   istic 
  Lower 
  Oligocene 
  species, 
  which 
  have 
  been 
  met 
  with 
  neither 
  in 
  

   the 
  older 
  nor 
  in 
  the 
  younger 
  beds, 
  therefore 
  there 
  can 
  be 
  no 
  doubt 
  

   that 
  the 
  Brockenhurst 
  beds, 
  and 
  with 
  them 
  the 
  Headon 
  series 
  at 
  

   Colwell 
  Bay 
  and 
  Whitecliff 
  Bay, 
  belong 
  to 
  the 
  Lower 
  Oligocene. 
  

  

  The 
  Middle 
  Oligocene 
  occupies 
  a 
  very 
  great 
  surface 
  of 
  the 
  Con- 
  

   tinent 
  : 
  in 
  France 
  the 
  " 
  Sables 
  de 
  Eontainebleau 
  " 
  are 
  well 
  known 
  ; 
  

   and 
  the 
  Mayence 
  Basin 
  is 
  equally 
  so, 
  through 
  the 
  excellent 
  work 
  of 
  

   Professor 
  Sandberger. 
  M. 
  de 
  Koninck 
  many 
  years 
  ago, 
  and 
  M. 
  Nyst 
  

   more 
  recently, 
  have 
  described 
  the 
  fossils 
  of 
  the 
  Rupelmonde 
  Clay 
  of 
  

   Belgium. 
  The 
  Rupelmonde 
  Clay, 
  or 
  Clay 
  with 
  Septaria 
  as 
  it 
  is 
  

   called 
  in 
  Germany, 
  is 
  covered 
  by 
  the 
  Upper 
  Oligocene 
  strata 
  (yellow 
  

   and 
  green 
  marls) 
  round 
  Cassel 
  in 
  Hesse, 
  as 
  Professor 
  Beyrich 
  has 
  de- 
  

   scribed 
  in 
  another 
  paper 
  read 
  before 
  the 
  Royal 
  Academy 
  of 
  Berlin*. 
  

  

  Proceeding 
  eastward, 
  we 
  find 
  numerous 
  localities 
  where 
  Middle- 
  

   Oligocene 
  beds 
  occur, 
  sometimes 
  superposed 
  to 
  the 
  Lower 
  Oligocene, 
  

   as 
  in 
  the 
  neighbourhood 
  of 
  Brunswick, 
  Magdeburg, 
  Cothen, 
  Berlin, 
  

   and 
  Freienwalde 
  in 
  Mecklenburg, 
  and, 
  last 
  of 
  all, 
  north 
  of 
  Stettin, 
  

   where 
  they 
  consist 
  of 
  several 
  hundred 
  feet 
  of 
  yellow 
  ferruginous 
  

   sands, 
  with 
  occasional 
  layers 
  of 
  dark 
  " 
  Septarien-Thon." 
  Gene- 
  

   rally 
  the 
  Middle 
  Oligocene 
  is 
  developed 
  as 
  a 
  dark 
  bluish 
  clay, 
  pos- 
  

   sessing 
  then 
  a 
  true 
  marine 
  fauna 
  identical 
  with 
  that 
  of 
  Rupelmonde 
  

   (south 
  of 
  Antwerp), 
  and 
  containing 
  Leda 
  Deshayesii, 
  Fusus 
  multisul- 
  

   catus, 
  Nyst, 
  and 
  Pleurotomce 
  as 
  the 
  most 
  common 
  fossils 
  ; 
  this 
  

   clay 
  has 
  always 
  been 
  considered 
  as 
  being 
  the 
  upper 
  part 
  of 
  the 
  

   Middle 
  Oligocene, 
  and 
  is 
  so 
  in 
  reality 
  in 
  Belgium, 
  and 
  generally 
  in 
  

   Germany. 
  

  

  In 
  the 
  Mayence 
  Basin, 
  the 
  Rupelmonde 
  Clay 
  was 
  discovered 
  only 
  a 
  

  

  * 
  "Ueber 
  die 
  Stellung 
  der 
  Hessischen 
  Tertiarbildungen." 
  Bericbt 
  der 
  K. 
  

   Preuss. 
  Akad. 
  der 
  Wissenschaften 
  zu 
  Berlin. 
  Aus 
  dem 
  Jahre 
  1854, 
  p. 
  640. 
  

  

  