﻿72 
  

  

  PROCEEDINGS 
  OE 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  

  

  estuarine 
  conditions. 
  The 
  author, 
  on 
  p. 
  160, 
  gives 
  five 
  comparative 
  

   vertical 
  sections 
  of 
  the 
  coal-bearing 
  strata 
  in 
  Sutherland 
  and 
  Ross, 
  

   viz. 
  at 
  Doll, 
  Fascally, 
  Inverbrora, 
  Strathsteven, 
  and 
  Cadh'-an-Righ. 
  

   Commencing 
  at 
  the 
  top 
  of 
  each 
  section, 
  the 
  well-known 
  "Roof- 
  

   bed," 
  which 
  is 
  the 
  lowest 
  bed 
  of 
  the 
  Middle 
  Oolite, 
  is 
  marine 
  in 
  

   origin 
  and 
  of 
  Callovian 
  age. 
  Twenty-four 
  species 
  of 
  bivalves, 
  all 
  pro- 
  

   bably 
  characterizing 
  the 
  Inferior 
  Oolite, 
  are 
  recorded 
  by 
  Mr. 
  Judd. 
  

   There 
  are 
  13 
  genera 
  and 
  16 
  species 
  of 
  Dimyaria, 
  6 
  genera 
  and 
  6 
  

   species 
  of 
  Monomyaria, 
  and 
  2 
  species 
  of 
  Brachiopoda, 
  with 
  some 
  

   plant-remains. 
  With 
  the 
  exception 
  of 
  plant-remains, 
  nothing 
  but 
  

   bivalves 
  are 
  given 
  here. 
  

  

  The 
  Middle 
  Oolite 
  is 
  fully 
  represented 
  in 
  Sutherland 
  by 
  alter- 
  

   nating 
  marine 
  and 
  estuarine 
  strata, 
  representing 
  the 
  zone 
  of 
  Ammo- 
  

   nites 
  calloviensis. 
  The 
  lowest 
  stratum 
  is 
  the 
  " 
  Roof-bed 
  " 
  of 
  the 
  

   main 
  coal-seam 
  *. 
  No 
  less 
  than 
  60 
  species 
  occur 
  in 
  this 
  " 
  Roof- 
  

   bed." 
  Calloviensis-zone 
  : 
  — 
  

  

  Belemites 
  1 
  genus 
  and 
  2 
  species. 
  

  

  Ammonites 
  1 
  ,, 
  4 
  

  

  Gasteropoda 
  4 
  

  

  Dimyaria 
  18 
  

  

  Monomyaria 
  7 
  

  

  Saurian 
  tooth 
  .... 
  1 
  

   Wood-remains 
  .... 
  1 
  

  

  4 
  

  

  33 
  

  

  15 
  

  

  1 
  

  

  1 
  

  

  33 
  

  

  60 
  

  

  The 
  " 
  roof-bed 
  " 
  above 
  the 
  Brora 
  coal-series 
  is 
  crowded 
  with 
  Am- 
  

   monites 
  Jason 
  ; 
  and, 
  except 
  in 
  the 
  somewhat 
  more 
  sandy 
  character 
  

   of 
  the 
  beds, 
  this 
  Middle 
  Oolite 
  is 
  scarcely 
  distinguishable 
  in 
  any 
  

   way 
  from 
  its 
  equivalent 
  in 
  many 
  parts 
  of 
  Suabia, 
  France, 
  and 
  

   England. 
  

  

  Prof. 
  Judd 
  gives 
  the 
  names 
  of 
  30 
  species 
  from 
  the 
  argillaceous 
  

   series 
  above 
  the 
  Brora 
  coal-series 
  and 
  the 
  '■'■Am. 
  ornatus 
  " 
  clays 
  : 
  — 
  

  

  Belemnites 
  1 
  genus 
  and 
  2 
  species. 
  

  

  Ammonites 
  1 
  „ 
  12 
  „ 
  

  

  Gasteropoda 
  3 
  „ 
  4 
  „ 
  

  

  Dimyaria 
  8 
  ,, 
  8 
  „ 
  

  

  Monomyaria 
  4 
  „ 
  4 
  ,, 
  

  

  Wood 
  

  

  17 
  30 
  

  

  We 
  are 
  struck 
  here 
  with 
  the 
  preponderance 
  of 
  species 
  of 
  Am- 
  

   monites, 
  which 
  also 
  occurs 
  in 
  the 
  Yorkshire 
  Kellaways 
  rock, 
  and 
  

  

  * 
  I 
  have 
  collected 
  from 
  this 
  bed 
  underground 
  in 
  the 
  Brora 
  pit 
  Pholadomya 
  

   Murchisonii, 
  Anatina 
  undulata, 
  Goniomya, 
  Isocardia 
  tenera, 
  Modiola 
  cuncata, 
  

   Pinna, 
  Pteropema, 
  Pecten 
  lens, 
  and 
  Gryphcea 
  dilatata. 
  — 
  K-. 
  E, 
  

  

  