﻿1864.] 
  BIGSBY 
  MISSING 
  SEDIMENTARY 
  FORMATIONS. 
  213 
  

  

  the 
  Oolitic 
  formation, 
  and 
  have 
  selected 
  fifteen 
  cases 
  of 
  gaps 
  in 
  dif- 
  

   ferent 
  countries, 
  besides 
  the 
  two 
  mentioned 
  in 
  Table 
  B, 
  passing 
  in 
  

   silence 
  many 
  more. 
  The 
  reader 
  will 
  perceive 
  how 
  frequently 
  the 
  

   subject 
  has 
  been 
  enriched 
  by 
  the 
  valuable 
  writings 
  of 
  Yicomte 
  

   d'Archiac. 
  

  

  b. 
  Lias. 
  — 
  As 
  in 
  the 
  Oolite 
  just 
  reviewed, 
  so 
  in 
  its 
  closely 
  connected 
  

   group, 
  the 
  Lias, 
  all 
  its 
  parts 
  are 
  seldom 
  found 
  in 
  the 
  same 
  place. 
  

   Beyrich 
  reports 
  that 
  the 
  first 
  stage 
  is 
  absent 
  on 
  the 
  north 
  side 
  of 
  

   the 
  Hartz*. 
  We 
  seek 
  in 
  vain 
  in 
  the 
  Swabian 
  Lias 
  for 
  Corals, 
  which 
  

   are 
  especial 
  evidence 
  of 
  shallow 
  seas 
  ; 
  while 
  Calvados 
  is 
  very 
  rich 
  in 
  

   them. 
  In 
  Burgundy, 
  the 
  Jura 
  Mountains, 
  and 
  Normandy, 
  whole 
  

   banks 
  and 
  reefs 
  of 
  Corals 
  are 
  met 
  with 
  in 
  the 
  Brown 
  Jurassic 
  rocks 
  ; 
  

   in 
  Swabia 
  they 
  are 
  rare 
  f. 
  

  

  In 
  Wiirtemberg, 
  where 
  this 
  formation 
  is 
  well 
  developed, 
  it 
  is 
  

   never 
  complete 
  % 
  ; 
  and 
  Chev. 
  von 
  Uauer, 
  in 
  the 
  eastern 
  or 
  Austrian 
  

   Alps, 
  perceived 
  that 
  one 
  or 
  two 
  terms 
  were 
  always 
  missing 
  §. 
  In 
  

   the 
  Bocage 
  of 
  La 
  Vendee, 
  Fournet 
  || 
  says 
  there 
  is 
  no 
  Lower 
  Lias, 
  

   and 
  very 
  little 
  of 
  Upper 
  ; 
  and 
  in 
  the 
  Swiss 
  Jura 
  the 
  Lower 
  Sand- 
  

   stone 
  of 
  this 
  group 
  is 
  absent 
  %. 
  

  

  In 
  his 
  Bridgewater 
  Treatise 
  (vol. 
  i. 
  p. 
  307), 
  Dr. 
  Buckland 
  gives 
  

   two 
  excellent 
  proofs 
  of 
  the 
  occurrence 
  of 
  an 
  interval 
  between 
  the 
  

   deposition 
  of 
  the 
  component 
  parts 
  of 
  the 
  Lias 
  : 
  the 
  one 
  is 
  from 
  the 
  

   floor 
  being 
  sprinkled 
  with 
  coprolites 
  ; 
  and 
  the 
  other 
  the 
  fact 
  of 
  the 
  

   Belemnites 
  lying 
  in 
  thousands, 
  spread 
  out 
  horizontally, 
  and 
  covered 
  

   with 
  Serpulites 
  and 
  Mollusks. 
  In 
  two 
  cases 
  the 
  Lias 
  rests 
  on 
  Car- 
  

   boniferous 
  Limestone 
  (France 
  and 
  Wales)**. 
  In 
  two 
  others 
  it 
  lies 
  on 
  

   Old 
  Red 
  Sandstone 
  (Scotland 
  and 
  Wales 
  f 
  f 
  ), 
  and 
  in 
  two 
  more 
  on 
  

   Silurian 
  in 
  France 
  (Gosselet 
  and 
  De 
  Beaumont 
  X+)- 
  It 
  lies 
  on 
  an 
  

   old 
  granite 
  in 
  the 
  Valley 
  of 
  the 
  Yonne 
  (France 
  §§), 
  and 
  on 
  meta- 
  

   morphic 
  rocks 
  in 
  Scotland 
  || 
  ||. 
  

  

  The 
  nature 
  of 
  the 
  gaps 
  resulting 
  from 
  these 
  imperfect 
  strati- 
  

   graphical 
  sequences 
  is 
  easily 
  recognized. 
  

  

  5. 
  With 
  a 
  Triassic 
  Roof. 
  — 
  There 
  are 
  extensive 
  blanks, 
  of 
  which 
  

   Triassic 
  rocks 
  form 
  the 
  roof. 
  In 
  the 
  central 
  part 
  of 
  Russia 
  in 
  

   Europe 
  %% 
  this 
  formation 
  does 
  not 
  exist. 
  Of 
  Muschelkalk 
  there 
  is 
  

   not 
  a 
  vestige 
  in 
  England 
  (unless 
  we 
  consider 
  the 
  waterstones 
  as 
  

   such), 
  nor 
  in 
  the 
  large 
  tracts 
  of 
  Trias 
  in 
  France 
  — 
  in 
  the 
  Departments 
  

   of 
  the 
  Saone 
  and 
  Loire, 
  of 
  the 
  Cote 
  d'Or 
  and 
  the 
  Rhone, 
  and 
  the 
  

   mountains 
  of 
  Charolois 
  and 
  Tararc 
  ***. 
  

  

  * 
  D'Archiac, 
  ' 
  Histoire 
  des 
  Progres,' 
  vol. 
  vii. 
  p. 
  518. 
  

   t 
  Fraas, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  vii. 
  p. 
  43. 
  

   \ 
  Ibid. 
  p. 
  459. 
  § 
  Ibid, 
  p. 
  394. 
  

  

  || 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xvi. 
  p. 
  416. 
  

   •j] 
  D'Archiac, 
  ' 
  Histoire 
  des 
  Progres,' 
  vol. 
  vii. 
  p. 
  74. 
  

  

  ** 
  Fournet, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xvi. 
  p. 
  416 
  ; 
  De 
  la 
  Beche, 
  

   Mem. 
  Geol. 
  Survey, 
  vol. 
  i. 
  pp. 
  262, 
  269, 
  279. 
  

  

  tt 
  Portlock, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xiv. 
  p. 
  cxxxvii. 
  

  

  |+ 
  De 
  la 
  Beche, 
  Mem. 
  Geol. 
  Survey, 
  vol. 
  i. 
  pp. 
  262, 
  269, 
  279. 
  

  

  §§ 
  Ebray, 
  Bull. 
  Soc. 
  Geol. 
  France, 
  2 
  e 
  serie, 
  vol. 
  xvi. 
  p. 
  427. 
  

  

  || 
  Portlock, 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xiv. 
  p. 
  cxxxvii. 
  

   ^[1[ 
  D'Archiac, 
  ' 
  Histoire 
  des 
  Progres,' 
  vol. 
  viii. 
  p. 
  566. 
  

   *** 
  De 
  Beaumont 
  and 
  Dufrenoy, 
  ' 
  Explication 
  Carte 
  Geol.' 
  vol. 
  ii. 
  p. 
  99. 
  

  

  