﻿1864.] 
  

  

  BIGSBY 
  MISSING 
  SEDIMENTARY 
  FORMATIONS. 
  

  

  215 
  

  

  Fig. 
  9. 
  — 
  Section 
  of 
  the 
  Coal-basin 
  of 
  the 
  Saone 
  et 
  Loire 
  (after 
  

   Dufrenoy 
  and 
  De 
  Beaumont). 
  

  

  Creusot. 
  

  

  A 
  BCD 
  

  

  A. 
  Granite. 
  

  

  B. 
  Porphyry. 
  

  

  C. 
  Pudding-stone. 
  

  

  Coal-measures. 
  

  

  D 
  D 
  D. 
  Coal-beds. 
  

   E. 
  Keuper. 
  

  

  At 
  Sierck, 
  on 
  the 
  Moselle*, 
  all 
  the 
  three 
  members 
  of 
  the 
  Trias, 
  

   considerably 
  inclined, 
  lie 
  on 
  old 
  quartzose 
  rocks, 
  also 
  inclined, 
  but 
  in 
  

   another 
  direction. 
  The 
  Triassic 
  strata 
  of 
  South 
  Staffordshire 
  f 
  are 
  

   in 
  contact 
  with 
  Silurian 
  ; 
  both 
  Carboniferous 
  and 
  Devonian 
  being 
  

   missing 
  in 
  parts, 
  D'Orbigny 
  mentions 
  a 
  similar 
  instance 
  in 
  South 
  

   America. 
  The 
  Upper 
  Trias 
  (4500 
  feet 
  thick) 
  of 
  the 
  eastern 
  or 
  

   Atlantic 
  flank 
  of 
  the 
  Appalachian 
  Mountains 
  abuts 
  upon 
  the 
  older 
  

   metamorphic 
  rocks, 
  and 
  thus 
  indicates 
  the 
  absence 
  of 
  five 
  great 
  

   formations 
  :{:. 
  The 
  Triassic 
  coal-field, 
  near 
  Bichmond 
  in 
  Virginia, 
  is 
  

   superimposed 
  on 
  a 
  granite 
  newer 
  than 
  itself 
  ; 
  for 
  it 
  is 
  penetrated 
  by 
  

   veins 
  of 
  the 
  latter. 
  

  

  6. 
  With 
  a 
  Permian 
  Roof. 
  — 
  A 
  few 
  examples 
  must 
  suffice 
  in 
  evi- 
  

   dence 
  that 
  gaps 
  are 
  not 
  uncommon 
  between 
  this 
  formation 
  and 
  

   those 
  below 
  it. 
  They 
  occur 
  in 
  countries 
  very 
  distant 
  from 
  each 
  

   other, 
  and 
  differ 
  from 
  those 
  of 
  other 
  epochs 
  in 
  the 
  interval 
  rarely 
  

   consisting 
  even 
  of 
  one 
  whole 
  period. 
  They 
  are, 
  as 
  far 
  as 
  known 
  to 
  

  

  Fig. 
  10. 
  — 
  Diagram 
  showing 
  the 
  general 
  Relations 
  of 
  the 
  Palosozoic 
  

   Rocks 
  of 
  Saxony 
  (after 
  Murchison 
  and 
  Morris). 
  

  

  a. 
  Silurian. 
  

  

  b. 
  Devonian. 
  

  

  c. 
  Lower 
  Carboniferous. 
  

  

  d. 
  Upper 
  Carboniferous. 
  

  

  e. 
  Kothliegende. 
  

   * 
  Plant-beds. 
  

   /. 
  Zechstein. 
  

   g. 
  Sandschiefer. 
  

  

  Permian. 
  

  

  * 
  De 
  Beaumont 
  and 
  Dufrenoy, 
  Explication 
  Carte 
  G-eol. 
  vol. 
  ii. 
  p. 
  13. 
  

   f 
  Jukes, 
  ' 
  Bibliotheque 
  Universelle 
  de 
  Geneve,' 
  vol. 
  xiii. 
  p. 
  69, 
  1850. 
  

   j 
  Emmons, 
  ' 
  Geology 
  of 
  North 
  Carolina,' 
  1856. 
  

  

  VOL. 
  XX. 
  PART 
  I. 
  Q 
  

  

  