﻿176 
  proceedings 
  oe 
  the 
  geological 
  society. 
  

  

  § 
  4. 
  Interior 
  Oolite. 
  

  

  Plants. 
  — 
  The 
  Jurassic 
  Plantae 
  number 
  63 
  genera 
  and 
  192 
  species, 
  

   41 
  genera 
  and 
  130 
  species 
  of 
  which 
  are 
  confined 
  to 
  the 
  Inferior 
  

   Oolite, 
  not 
  one 
  of 
  them, 
  so 
  far 
  as 
  we 
  know, 
  passing 
  the 
  upper 
  limits 
  

   of 
  that 
  formation. 
  The 
  remaining 
  61 
  species 
  chiefly 
  occur 
  in 
  the 
  

   Lias, 
  Great 
  Oolite, 
  and 
  Coral 
  Rag, 
  the 
  7 
  species 
  in 
  the 
  latter 
  

   formation 
  being 
  special 
  to 
  it. 
  Almost 
  every 
  species 
  occurs 
  in 
  the 
  

   estuarine 
  shales 
  and 
  sandstones 
  of 
  the 
  Yorkshire 
  coast, 
  either 
  in 
  the 
  

   Scarborough 
  or 
  Whitby 
  area. 
  The 
  Middle 
  Shales 
  and 
  Sandstones 
  

   contain 
  17 
  genera 
  and 
  about 
  50 
  species, 
  the 
  Lower 
  13 
  genera 
  and 
  

   30 
  species. 
  The 
  chief 
  genera 
  are 
  Otozamites, 
  10 
  species, 
  Pecopteris, 
  

   22, 
  Phlebopteris, 
  8, 
  Pterophyllum, 
  9, 
  Sphenopteris, 
  16. 
  15 
  genera 
  

   possess 
  only 
  1 
  species 
  in 
  each, 
  15 
  genera 
  2 
  species, 
  4 
  genera 
  3 
  species, 
  

   and 
  2 
  genera 
  4 
  species. 
  This 
  shows 
  us 
  that 
  many 
  of 
  the 
  genera 
  

   must 
  be 
  established 
  on 
  very 
  slender 
  evidence, 
  which 
  the 
  poverty 
  

   of 
  the 
  material 
  seems 
  to 
  warrant 
  upon 
  critical 
  examination. 
  In 
  

   Yorkshire, 
  or 
  the 
  classical 
  locality, 
  the 
  Equisetacece 
  are 
  illustrated 
  by 
  

   2 
  species, 
  the 
  Lycopodiacece 
  by 
  1, 
  the 
  Filicece 
  by 
  53 
  species, 
  the 
  

   Cycadacece 
  by 
  23 
  species 
  and 
  the 
  Coniferce 
  by 
  7. 
  There 
  is 
  no 
  other 
  

   locality 
  in 
  the 
  British 
  Islands 
  where 
  such 
  an 
  assemblage 
  of 
  Jurassic 
  

   plants 
  can 
  be 
  studied. 
  No 
  complete 
  plant 
  is 
  known 
  in 
  the 
  Forest 
  

   Marble; 
  but 
  innumerable 
  fragments 
  of 
  coniferous 
  wood 
  occur 
  in 
  the 
  

   flaggy 
  beds 
  of 
  which 
  it 
  is 
  chiefly 
  composed. 
  Nor 
  is 
  any 
  species 
  

   known 
  from 
  the 
  Fuller's 
  Earth, 
  Cornbrash, 
  or 
  Kellaways 
  Rock. 
  

   Cycadeostrobus 
  sphcrriciis 
  is 
  the 
  only 
  Oxford-clay 
  species 
  ; 
  and 
  7 
  are 
  

   known 
  from 
  the 
  Coralline 
  beds 
  — 
  Araucarites 
  Hudlestoni, 
  Bennettites 
  

   Peachianus, 
  Bucklandia 
  Milleriana, 
  Carpoliihes 
  BucJrfandi, 
  C. 
  coni- 
  

   cus, 
  Yatesia 
  crassa, 
  and 
  Y. 
  Joassiana 
  ; 
  Pinites 
  depressus 
  is 
  the 
  only 
  

   species 
  occurring 
  in 
  the 
  Kimmeridge 
  Clay. 
  The 
  so-called 
  Great- 
  

   Oolite 
  flora 
  is 
  mostly, 
  if 
  not 
  entirely, 
  confined 
  to 
  the 
  underlying 
  

   fissile 
  Stonesfield 
  Slate 
  or 
  lowest 
  zone 
  of 
  the 
  formation 
  (not 
  present 
  

   everywhere 
  where 
  the 
  more 
  calcareous 
  overlying 
  Limestones 
  are 
  

   widely 
  spread). 
  

  

  At 
  Stonesfield 
  in 
  Oxfordshire, 
  and 
  Eyeford 
  and 
  Sevenhampton 
  

   in 
  Gloucestershire, 
  these 
  " 
  slates 
  " 
  occur 
  as 
  a 
  thin 
  band 
  beneath 
  the 
  

   true 
  Great 
  or 
  Bath 
  Oolite 
  ; 
  and 
  in 
  them, 
  especially 
  near 
  Oxford, 
  an 
  

   abundant 
  flora 
  has 
  been 
  obtained. 
  Prof. 
  Phillips, 
  in 
  his 
  work 
  ' 
  On 
  

   the 
  Geology 
  of 
  Oxford 
  and 
  the 
  Valley 
  of 
  the 
  Thames,' 
  enumerates, 
  

   figures, 
  and 
  describes 
  a 
  large 
  and 
  interesting 
  flora, 
  comprising 
  

   nearly 
  40 
  species 
  ; 
  numerically 
  there 
  are 
  — 
  

  

  Genera. 
  Species. 
  

  

  Alg33 
  1 
  .... 
  1 
  

  

  Filices 
  6 
  .... 
  11 
  

  

  MonocotyledoneaB 
  5 
  .... 
  6 
  

  

  Cycadaceae 
  3 
  .... 
  9 
  

  

  Coniferae 
  2 
  .... 
  5 
  

  

  Fruits 
  3 
  4 
  

  

  20 
  .... 
  36 
  

  

  