﻿1864.] 
  POWRIE 
  FORFARSHIRE 
  FOSSILS. 
  413 
  

  

  2. 
  On 
  the 
  Geological 
  Structure 
  of 
  the 
  Malvern 
  Hills 
  and 
  adjacent 
  

   District. 
  By 
  Harvey 
  E. 
  Holl, 
  M.D., 
  F.G.S. 
  

  

  [The 
  publication 
  of 
  this 
  paper 
  is 
  postponed.] 
  

   [Abstract.] 
  

   The 
  object 
  of 
  this 
  communication 
  was 
  threefold, 
  namely, 
  (1) 
  to 
  dis- 
  

   cuss 
  the 
  structure 
  and 
  origin 
  of 
  the 
  crystalline 
  rocks 
  of 
  the 
  Malvern 
  

   Hills 
  ; 
  (2) 
  to 
  give 
  the 
  results 
  of 
  an 
  examination 
  of 
  the 
  superposed 
  

   Palaeozoic 
  strata 
  ; 
  (3) 
  to 
  state 
  the 
  chronological 
  relationship 
  of 
  the 
  

   several 
  events 
  in 
  their 
  geological 
  history. 
  

  

  The 
  geological 
  structure 
  of 
  these 
  hills 
  was 
  described 
  in 
  detail, 
  and 
  

   it 
  was 
  concluded 
  that 
  the 
  rocks 
  hitherto 
  treated 
  of 
  as 
  syenite, 
  and 
  

   supposed 
  to 
  form 
  the 
  axis 
  of 
  the 
  range, 
  are 
  in 
  reality 
  of 
  metamorphic 
  

   origin, 
  consisting 
  of 
  gneiss 
  (both 
  micaceous 
  and 
  hornblendic), 
  mica- 
  

   schist, 
  hornblende-schist, 
  &c, 
  all 
  invaded 
  by 
  veins 
  of 
  granite 
  and 
  

   trap-rocks. 
  It 
  was 
  then 
  shown 
  that 
  the 
  Hollybush 
  Sandstone 
  is 
  the 
  

   equivalent 
  of 
  the 
  Middle 
  Lingula-flags, 
  and 
  that 
  the 
  overlying 
  black 
  

   shales 
  correspond 
  with 
  the 
  Upper 
  Lingula-beds, 
  the 
  whole 
  being 
  

   overlain, 
  as 
  in 
  Wales, 
  by 
  Dictyonema- 
  shales. 
  These 
  rocks, 
  on 
  the 
  

   east 
  of 
  the 
  Herefordshire 
  Beacon, 
  are 
  altered 
  by 
  trap- 
  dykes, 
  which 
  

   were 
  shown 
  to 
  be 
  of 
  later 
  date 
  than 
  those 
  traversing 
  the 
  crystalline 
  

   rocks 
  before 
  alluded 
  to. 
  Allusion 
  was 
  next 
  made 
  to 
  the 
  Upper 
  

   Llandovery 
  strata 
  which 
  overlie 
  unconformably 
  the 
  Primordial 
  rocks 
  

   just 
  noticed 
  ; 
  after 
  which 
  the 
  several 
  faults 
  in 
  the 
  district 
  were 
  de- 
  

   scribed 
  in 
  detail. 
  

  

  Dr. 
  Holl 
  concluded 
  with 
  some 
  remarks 
  on 
  the 
  general 
  relations 
  of 
  

   the 
  rocks 
  of 
  the 
  Malvern 
  Hills 
  with 
  those 
  of 
  the 
  surrounding 
  dis- 
  

   tricts, 
  describing 
  the 
  successive 
  physical 
  changes 
  supposed 
  to 
  have 
  

   been 
  consequent 
  upon 
  their 
  deposition 
  and 
  their 
  subsequent 
  eleva- 
  

   tions 
  and 
  depressions. 
  

  

  June 
  22, 
  1864. 
  

  

  T. 
  Currie 
  Gregory, 
  Esq., 
  C.E., 
  149 
  "West 
  George 
  Street, 
  Glasgow 
  ; 
  

   John 
  Hamilton, 
  Esq., 
  Tyne 
  Court 
  ; 
  Edward 
  Langdon, 
  Esq., 
  B.A. 
  

   (Oxon.), 
  New 
  College, 
  Oxford 
  ; 
  and 
  George 
  Paddisen, 
  Esq.,M.I.C.E., 
  

   Petersham, 
  Surrey, 
  were 
  elected 
  Eellows. 
  

  

  M. 
  Bosquet, 
  of 
  Maestricht 
  ; 
  M. 
  Jules 
  Desnoyers, 
  of 
  Paris 
  ; 
  and 
  

   Dr. 
  Charles 
  Martins, 
  of 
  Montpellier, 
  were 
  elected 
  Foreign 
  Corre- 
  

   spondents. 
  

  

  The 
  following 
  communications 
  were 
  read 
  : 
  — 
  

  

  1. 
  On 
  the 
  Fossiliferous 
  Rocks 
  of 
  Forfarshire 
  and 
  their 
  Contents. 
  

  

  By 
  J. 
  Powrie, 
  Esq., 
  F.G.S, 
  

  

  [Plate 
  XX.] 
  

  

  As 
  stated 
  in 
  a 
  former 
  paper 
  *, 
  the 
  lower 
  members 
  of 
  the 
  Forfarshire 
  

  

  Old 
  Bed 
  Sandstone 
  consist 
  of 
  gritty 
  beds 
  and 
  pebbly 
  conglomerates 
  

  

  having 
  a 
  highly 
  indurated 
  matrix, 
  passing 
  upwards 
  into 
  conglomerates 
  

  

  * 
  Quart. 
  Journ. 
  Geol. 
  Soc. 
  vol. 
  xvii. 
  p. 
  534. 
  

  

  VOL. 
  XX. 
  PART 
  I. 
  2 
  G 
  

  

  