124  PROCEEDINGS  OF  THE  GEOLOGICAL  SOCIETY.  [May  18935, 
learnt  as  regards  the  Kimeridge  Clay  at  this  point,  but  it  was 
mentioned  during  the  discussion  that  in  a  boring  not  far  off,  which 
had  been  commenced  in  Cretaceous  beds,  the  Portland  Sands,  so 
well  developed  at  Swindon,  were  already  wanting. 
Saline  waters  were  met  with  in  the  Corallian  Pocks,  and  again  in 
the  Forest  Marble,  where  the  amount  was  found  to  be  upwards  of 
2000  grains  per  gallon,  chiefly  chlorides.  Attention  was  also  drawn 
to  the  occurrence  of  saline  waters  in  the  Jurassic  rocks  at  other 
localities  in  the  neighbourhood. 
This  seems  to  be  the  proper  place  to  notice  another  paper  by 
Mr.  Poberts,  4  On  the  Correlation  of  the  Upper  Jurassics  of  the  Swiss 
Jura  with  those  of  England.’  He  commences  by  referring  to  the 
fact  that  since  the  days  of  Oppel’s  4  Jura-Formation  ’  but  little  had 
been  done  in  this  direction,  though  many  new  discoveries  had  been 
made  in  both  countries.  As  regards  the  Swiss  Jura  itself,  it  so 
happens  that  there  is  a  considerable  difference  in  the  development 
of  the  Upper  Jurassics  in  the  northern  and  southern  districts,  and  it 
becomes  necessary  to  institute  a  comparison  between  these  districts 
before  a  more  extended  correlation  is  possible.  It  is  scarcely  neces¬ 
sary  to  remark  that  the  grouping  is  variously  stated  by  different 
authors,  and  it  is  evident  that  many  of  the  terms  borrowed  from 
English  geology  have  a  different  value  in  Switzerland  from  that 
which  they  bear  in  this  country. 
Departing  from  the  plan  hitherto  adopted,  it  seems  convenient 
in  this  particular  instance  to  follow  Mr.  Poberts  in  an  ascending 
sequence,  and  thus  to  commence  at  the  base.  The  importance 
assigned  to  the  Callovian  on  the  Continent  is  altogether  out  of 
proportion  to  our  practice  on  this  side  of  the  Channel,  where  the 
Kellaways  or  Kelloway  Pock  is  mainly  regarded  as  the  irregularly 
developed  arenaceous  base  of  the  Lower  Oxfordian.  If  regarded  as 
a  palaeontological  zone,  it  must  be  held  to  underlie  that  of  the 
Ammonites.  Hence,  whatever  we  may  think  of  the  Swiss 
zone  of  Ammonites  macrocephalus ,  which  is  a  kind  of  compound 
of  Cornbrash  and  Kell  (way  Pock,  it  is  evident  that  the  so-called 
4  Fer  sous-oxfordien  ’  of  the  Northern  Jura  answers  to  a  large  part 
of  our  Oxford  Clay.  On  the  other  hand,  the  Swiss  Oxfordian  Eeds 
answer  to  the  lower  part  of  our  Corallian,  such  as  the  Lower  Cal¬ 
careous  Grit  and  other  beds  below  the  regular  Coralline  Oolite  ;  while 
the  ‘  Terrains  a  Chailles  siiiceux  ’  and  the  4  Oolithe  Corallienne  ’ 
correspond  to  the  main  mass  of  our  Corallian  Limestones.  The 
whole  of  these  beds  are  but  feebly  developed  in  the  Southern  Jura. 
