﻿A. 
  W. 
  EBGELL 
  ON 
  BITBLEIGH-SALTERION 
  LAMELEIBRANCHS. 
  45 
  

  

  9. 
  Notes 
  on 
  some 
  Lamellibkanchs 
  of 
  the 
  Bubleigh-Salterton: 
  

   Pebbles. 
  By 
  Arthur 
  "Wyatt 
  Ebgell, 
  Esq., 
  F.G.S. 
  (Read 
  

   January 
  7, 
  1874.) 
  

  

  [Plates 
  IV.-VL] 
  

  

  It 
  will 
  be 
  recollected 
  that 
  in 
  the 
  Quarterly 
  Journal 
  of 
  the 
  Geologi- 
  

   cal 
  Society, 
  vol. 
  xx. 
  p. 
  283, 
  there 
  is 
  a 
  paper 
  by 
  Mr. 
  Vicary, 
  of 
  

   Exeter, 
  drawing 
  attention 
  to 
  the 
  pebble-bed 
  of 
  Budleigh-Salterton 
  ; 
  

   appended 
  to 
  this 
  is 
  a 
  description 
  of 
  some 
  of 
  the 
  included 
  fossils 
  by 
  

   the 
  late 
  Mr. 
  Salter. 
  Since 
  this 
  a 
  paper 
  on 
  the 
  Brachiopoda 
  from 
  

   the 
  pebbles 
  has 
  been 
  given 
  (in 
  vol. 
  xxvi. 
  p. 
  70) 
  by 
  Mr. 
  Davidson. 
  In 
  

   the 
  former 
  paper 
  a 
  full 
  description 
  of 
  the 
  bed 
  is 
  given 
  by 
  Mr. 
  Vicary, 
  

   to 
  which 
  there 
  is 
  little 
  or 
  nothing 
  to 
  add. 
  It 
  is 
  sufficient 
  to 
  say 
  that 
  

   it 
  consists 
  of 
  a 
  bed 
  of 
  nearly 
  100 
  feet 
  of 
  pebbles 
  of 
  various 
  rocks, 
  

   inclined 
  at 
  a 
  low 
  angle 
  to 
  the 
  horizon, 
  lying 
  on 
  and 
  covered 
  by 
  the 
  

   Trias, 
  that 
  the 
  pebbles 
  contain 
  fossils, 
  as 
  a 
  rule, 
  unknown 
  elsewhere 
  

   in 
  England, 
  that 
  the 
  fossils 
  in 
  some 
  are 
  Silurian 
  and 
  in 
  others 
  

   Devonian, 
  and 
  that 
  the 
  matrix 
  including 
  Silurian 
  and 
  Devonian 
  

   fossils 
  is 
  often 
  identical. 
  Through 
  the 
  kindness 
  of 
  Mr. 
  Vicary 
  I 
  

   have 
  been 
  allowed 
  to 
  figure 
  some 
  of 
  the 
  more 
  remarkable 
  Lamelli- 
  

   branchs 
  in 
  his 
  collection 
  which 
  were 
  undescribed 
  by 
  Mr. 
  Salter 
  (or 
  

   of 
  which 
  the 
  descriptions 
  and 
  figures 
  have 
  been 
  lost) 
  ; 
  and 
  I 
  have 
  

   added 
  a 
  few 
  of 
  my 
  own. 
  This 
  task 
  would 
  not 
  have 
  been 
  attempted 
  

   had 
  there 
  been 
  any 
  chance 
  of 
  a 
  more 
  competent 
  person's 
  under- 
  

   taking 
  it. 
  The 
  figures 
  annexed 
  have 
  been 
  submitted 
  to 
  M. 
  Lebes- 
  

   conte, 
  of 
  Bennes, 
  who 
  has 
  a 
  large 
  collection 
  of 
  Norman 
  and 
  Breton 
  

   fossils 
  ; 
  he 
  recognizes 
  several 
  of 
  them. 
  M. 
  Bayan, 
  of 
  the 
  Ecole 
  des 
  

   Mines 
  at 
  Paris, 
  has 
  also 
  seen 
  them, 
  and 
  compared 
  them 
  with 
  the 
  

   collections 
  of 
  MM. 
  d'Orbigny 
  and 
  de 
  Verneuil 
  ; 
  they 
  have 
  also 
  been 
  

   shown 
  to 
  M. 
  Gaston 
  de 
  Tromelin, 
  who 
  is 
  working 
  at 
  the 
  Norman 
  and 
  

   Breton 
  rocks. 
  

  

  In 
  July 
  last 
  I 
  visited 
  M. 
  de 
  Tromelin 
  at 
  Argentan, 
  and 
  was 
  much 
  

   struck 
  by 
  the 
  general 
  resemblance 
  between 
  the 
  fossils 
  and 
  rock- 
  

   specimens 
  in 
  his 
  collection 
  to 
  those 
  in 
  that 
  of 
  Mr. 
  Vicary. 
  The 
  

   first 
  question 
  I 
  asked 
  was, 
  " 
  whether 
  Orthis 
  reduce 
  was 
  by 
  far 
  the 
  

   most 
  abundant 
  fossil," 
  which 
  is 
  notably 
  the 
  case 
  in 
  Devon 
  ; 
  the 
  

   answer 
  was 
  that 
  no 
  other 
  shell 
  was 
  nearly 
  so 
  frequent 
  ; 
  and 
  this 
  

   appears 
  to 
  be 
  worth 
  noting. 
  M. 
  de 
  Tromelin 
  obligingly 
  took 
  me 
  to 
  

   see 
  some 
  beds 
  of 
  quartzite 
  near 
  Trun 
  (about 
  six 
  miles 
  from 
  Argen- 
  

   tan) 
  which 
  are 
  used 
  for 
  road-metal, 
  they 
  are 
  believed 
  to 
  be 
  the 
  

   " 
  Gres 
  Armoricain." 
  It 
  was 
  easy 
  to 
  recognize 
  in 
  these 
  beds 
  the 
  

   material 
  of 
  one 
  of 
  our 
  commonest 
  Budleigh 
  pebbles, 
  which 
  is 
  

   whitish 
  hard 
  quartzite, 
  with 
  a 
  profusion 
  of 
  Trachyderma 
  traver- 
  

   sing 
  it. 
  M. 
  de 
  Tromelin 
  says 
  he 
  has 
  found 
  no 
  other 
  fossil 
  in 
  it. 
  

   Mr. 
  Vicary 
  tells 
  me 
  he 
  has 
  never 
  found 
  any 
  thing 
  in 
  the 
  same 
  pebble 
  

   with 
  Trachyderma 
  ; 
  nor 
  have 
  I. 
  These 
  beds 
  of 
  quartzite 
  are 
  nearly 
  

   vertical, 
  as 
  far 
  as 
  can 
  be 
  observed, 
  the 
  Trachyclerma-txibes 
  being 
  

  

  