﻿78 
  PKOCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  Mr. 
  Judd 
  also 
  believes 
  that 
  he 
  has 
  detected 
  fossils 
  indicating 
  the 
  

   presence 
  of 
  a 
  representative 
  of 
  the 
  Midford 
  Sands 
  of 
  England. 
  

  

  In 
  the 
  isolated 
  and 
  distant 
  Shiant 
  Isles 
  the 
  beds 
  containing 
  Am- 
  

   monites 
  Murchisonce 
  and 
  A. 
  corrugatus 
  are 
  well 
  shown, 
  although 
  the 
  

   shales 
  are 
  metamorphosed 
  into 
  masses 
  resembling 
  Lydian 
  stone. 
  

   These 
  Ammonites, 
  Belemnites 
  giganteus, 
  Bhynchonella 
  spinosa, 
  and 
  

   other 
  well-known 
  species 
  occur 
  further 
  south 
  in 
  Ardnamurchan 
  : 
  to 
  

   the 
  south 
  of 
  this 
  the 
  overlap 
  of 
  the 
  Upper 
  Cretaceous 
  rocks 
  covers 
  up 
  

   the 
  Jurassic 
  series. 
  

  

  The 
  Great 
  Estuarine 
  Series. 
  — 
  In 
  Skye 
  and 
  Kaasay 
  certain 
  beds 
  

   which 
  have 
  pronounced 
  estuarine 
  characters 
  succeed 
  the 
  Lower 
  

   Oolites 
  of 
  the 
  Western 
  Isles, 
  and 
  are 
  intercalated 
  between 
  them 
  

   and 
  the 
  representative 
  of 
  the 
  Oxford 
  Clay. 
  In 
  Eigg 
  and 
  Muck 
  they 
  

   are 
  thicker. 
  As 
  on 
  the 
  eastern 
  coast 
  of 
  Scotland, 
  two 
  distinct 
  

   types 
  occur, 
  the 
  arenaceous 
  and 
  the 
  argillo-calcareous, 
  the 
  former 
  

   resembling 
  the 
  Hastings 
  Sand, 
  and 
  the 
  latter 
  bearing 
  a 
  most 
  striking 
  

   analogy 
  to 
  the 
  Purbeck 
  and 
  Punfield 
  series 
  of 
  the 
  south 
  of 
  

   England. 
  This 
  series 
  is 
  completely 
  and 
  carefully 
  described 
  by 
  Mr. 
  

   Judd 
  (he. 
  cit. 
  pp. 
  722-726). 
  

  

  The 
  Oxford 
  Clay. 
  — 
  This 
  group 
  immediately 
  overlies 
  the 
  Great 
  

   Estuarine 
  series. 
  It 
  consists 
  of 
  blue 
  clays 
  and 
  argillaceous 
  lime- 
  

   stones 
  of 
  marine 
  origin. 
  These 
  clays 
  contain 
  a 
  fauna 
  representing 
  

   the 
  zone 
  of 
  Ammonites 
  cordatus, 
  or 
  the 
  middle 
  part 
  of 
  the 
  Oxford 
  Clay. 
  

   Edward 
  Eorbes 
  obtained 
  fossils 
  from 
  clays 
  of 
  the 
  same 
  age 
  at 
  Loch 
  

   Staffin. 
  Mr. 
  Judd 
  gives 
  a 
  list 
  from 
  the 
  Bay 
  of 
  Laig, 
  Island 
  of 
  Eigg, 
  

   in 
  which 
  no 
  fewer 
  than 
  7 
  species 
  out 
  of 
  19 
  are 
  Ammonites 
  and 
  2 
  

   Belemnites, 
  B. 
  sulcatus 
  and 
  B. 
  gracilis 
  ; 
  so 
  that 
  9 
  are 
  Cephalopoda. 
  

   There 
  are 
  also 
  6 
  genera 
  and 
  7 
  species 
  of 
  Bivalves, 
  a 
  Serpula, 
  a 
  fish- 
  

   defence, 
  and 
  wood 
  — 
  in 
  all 
  19 
  species. 
  Prof. 
  Judd 
  believes 
  that 
  beds 
  

   of 
  this 
  age, 
  although 
  imperfectly 
  exposed, 
  must 
  underlie 
  great 
  tracts 
  

   of 
  the 
  Miocene 
  basalts 
  of 
  the 
  Hebrides. 
  The 
  Oxford 
  Clay 
  of 
  Scotland 
  

   and 
  England 
  was 
  deposited 
  in 
  a 
  sea 
  of 
  considerable 
  depth 
  ; 
  probably 
  

   its 
  beds 
  originally 
  extended 
  over 
  much 
  of 
  what 
  is 
  now 
  the 
  area 
  of 
  the 
  

   British 
  Islands. 
  In 
  mineral 
  characters 
  and 
  life-succession 
  it 
  stri- 
  

   kingly 
  resembles 
  the 
  Anglo-Germanic 
  area 
  ; 
  and 
  there 
  can 
  be 
  no 
  

   doubt 
  that 
  the 
  Oxfordian 
  sea 
  of 
  that 
  life-province 
  was 
  of 
  wide 
  

   extent 
  and 
  of 
  considerable 
  depth, 
  and 
  probably 
  not 
  broken 
  up 
  

   into 
  a 
  number 
  of 
  isolated 
  portions 
  (loc. 
  cit. 
  p. 
  727). 
  The 
  remainder 
  

   of 
  Mr. 
  Judd's 
  able 
  memoir 
  is 
  devoted 
  to 
  the 
  Cretaceous 
  system 
  of 
  

   the 
  "Western 
  Highlands. 
  With 
  the 
  Cretaceous 
  group 
  I 
  have 
  at 
  pre- 
  

   sent 
  nothing 
  to 
  do, 
  the 
  Jurassic 
  series 
  alone 
  being 
  too 
  extensive 
  for 
  

   one 
  Address. 
  

  

  The 
  Table 
  facing 
  p. 
  736 
  is 
  an 
  elaborate 
  exposition 
  of 
  the 
  matter 
  

   contained 
  in 
  the 
  paper. 
  It 
  ranges 
  from 
  the 
  Poikilitic 
  rocks 
  to 
  the 
  

   Chalk, 
  and 
  gives 
  the 
  characteristic 
  fossils 
  in 
  each 
  division 
  of 
  the 
  

   several 
  formations 
  and 
  foreign 
  equivalents. 
  The 
  following 
  is 
  a 
  short 
  

   analysis 
  of 
  it 
  : 
  — 
  

  

  