﻿devono-silerian 
  formation. 
  209 
  

  

  Discussion. 
  

  

  The 
  President 
  said 
  that 
  the 
  paper 
  was 
  a 
  very 
  suggestive 
  one, 
  

   which 
  raised 
  a 
  number 
  of 
  very 
  doubtful 
  questions. 
  

  

  Prof. 
  Hughes 
  pointed 
  out 
  that 
  he 
  had 
  already 
  (Brit. 
  Assoc. 
  1875) 
  

   suggested 
  a 
  twofold 
  classification 
  of 
  these 
  deposits, 
  but 
  he 
  did 
  not 
  

   refer 
  the 
  same 
  beds 
  as 
  did 
  the 
  author 
  of 
  the 
  paper 
  to 
  the 
  upper 
  and 
  

   lower 
  divisions. 
  The 
  beds 
  which 
  followed 
  the 
  Silurian 
  without 
  a 
  

   break, 
  and 
  which 
  he 
  called 
  Sawdde 
  beds, 
  from 
  the 
  river 
  in 
  Caermar- 
  

   thenshire 
  along 
  which 
  the 
  best 
  continuous 
  section 
  is 
  seen, 
  were, 
  he 
  

   thought, 
  older 
  than 
  the 
  oldest 
  Devonian, 
  and 
  the 
  base 
  of 
  the 
  De- 
  

   vonian 
  was 
  represented 
  by 
  the 
  quartz-conglomerates 
  which 
  rest 
  

   upon 
  the 
  Sawdde 
  beds 
  and 
  underlie 
  the 
  brown 
  sandstones 
  of 
  the 
  

   Yans. 
  This 
  upper 
  division 
  he 
  considered 
  the 
  variable 
  basement- 
  

   series 
  of 
  the 
  Carboniferous, 
  and 
  thought 
  that 
  it 
  was 
  the 
  equivalent 
  

   of 
  the 
  thin 
  conglomerates 
  &c. 
  known 
  as 
  the 
  Old 
  Red 
  in 
  North 
  Wales 
  

   and 
  in 
  the 
  north 
  of 
  England, 
  and 
  of 
  the 
  Middle 
  and 
  Upper 
  Old 
  Red 
  

   of 
  Scotland 
  and 
  the 
  north 
  of 
  Ireland. 
  

  

  Mr. 
  Champeenowne 
  agreed 
  with 
  the 
  views 
  of 
  Prof. 
  Hull 
  as 
  to 
  the 
  

   estuarine 
  rather 
  than 
  lacustrine 
  character 
  of 
  the 
  "Welsh 
  Old 
  Eed, 
  

   regarding 
  it 
  as 
  probable 
  that 
  the 
  two 
  areas, 
  Welsh 
  and 
  North 
  

   Devonian, 
  were 
  united 
  at 
  the 
  period 
  of 
  the 
  (Upper) 
  Old 
  Red 
  Sand- 
  

   stone, 
  though 
  they 
  might 
  have 
  been 
  separated 
  during 
  the 
  accumula- 
  

   tion 
  of 
  the 
  Cornstone 
  series 
  and 
  the 
  Middle 
  and 
  Lower 
  Devonian 
  

   beds. 
  Consequently 
  he 
  thought 
  it 
  impossible 
  that 
  the 
  Poreland 
  

   beds 
  could 
  represent 
  the 
  quartz-conglomerate 
  at 
  the 
  base 
  of 
  the 
  

   Brownstone 
  group, 
  which 
  he 
  had 
  understood 
  Prof. 
  Hughes 
  to 
  

   suggest, 
  but 
  that 
  they 
  were 
  much 
  older. 
  Still 
  he 
  did 
  not 
  like 
  the 
  

   name 
  " 
  Devono-Silurian 
  " 
  for 
  the 
  Poreland 
  beds 
  and 
  their 
  presumed 
  

   equivalents. 
  He 
  thought 
  that 
  a 
  more 
  detailed 
  examination 
  of 
  them 
  

   had 
  been 
  made 
  by 
  Mr. 
  Ussher 
  than 
  perhaps 
  by 
  any 
  other 
  observer 
  ; 
  

   and 
  he 
  hoped 
  that 
  he 
  might 
  see 
  his 
  North-Devon 
  lines 
  adopted 
  by 
  

   the 
  Survey. 
  

  

  Rev. 
  H. 
  H. 
  Winwood 
  referred 
  to 
  the 
  difficulty 
  of 
  working 
  the 
  

   Poreland 
  beds 
  on 
  account 
  of 
  their 
  inaccessibilitj 
  T 
  . 
  

  

  The 
  President 
  said 
  one 
  of 
  the 
  chief 
  points 
  of 
  Mr. 
  Hull's 
  paper 
  

   was 
  that 
  the 
  Pickwell-Down 
  Sandstones 
  are 
  the 
  equivalents 
  of 
  the 
  

   Herefordshire 
  and 
  Welsh 
  and 
  all 
  the 
  Old 
  Red 
  Sandstone, 
  and 
  that 
  

   his 
  views 
  had 
  been 
  quite 
  misunderstood 
  in 
  the 
  discussion. 
  

  

  