﻿lxxxii 
  PROCEEDINGS 
  OE 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [May 
  1 
  897, 
  

  

  vitreous 
  and 
  semivitreous 
  lavas, 
  with 
  their 
  associated 
  agglomerates 
  

   and 
  ashes.' 
  He 
  did 
  not, 
  however, 
  recognize 
  that 
  they 
  were 
  of 
  pre- 
  

   Cambrian 
  age, 
  but 
  supposed 
  them 
  to 
  belong 
  to 
  the 
  ' 
  older 
  contempor- 
  

   aneous 
  volcanic 
  series 
  so 
  extensively 
  developed 
  in 
  the 
  Lower 
  Silurian 
  

   district 
  of 
  Salop 
  and 
  Eadnor.' 
  

  

  In 
  the 
  same 
  year 
  Dr. 
  Callaway 
  published 
  a 
  paper 
  in 
  the 
  Journal 
  

   of 
  this 
  Society, 
  vol. 
  xxxiii. 
  p. 
  652, 
  in 
  which 
  he 
  gave 
  an 
  account 
  of 
  

   the 
  discovery 
  by 
  him 
  some 
  years 
  before 
  of 
  Upper 
  Cambrian 
  fossils 
  in 
  

   the 
  Shineton 
  Shales 
  which 
  had 
  previously 
  been 
  classed 
  as 
  of 
  Caradoc 
  

   age. 
  He 
  also 
  mentioned 
  the 
  occurrence 
  of 
  underlying 
  rocks 
  which 
  

   he 
  correlated 
  with 
  the 
  Hollybush 
  Sandstone 
  near 
  Malvern. 
  

  

  As 
  the 
  result 
  of 
  these 
  discoveries 
  he 
  was 
  led 
  soon 
  afterwards 
  to 
  

   class 
  the 
  igneous 
  rocks 
  of 
  the 
  Wrekin 
  and 
  of 
  neighbouring 
  areas 
  as 
  

   of 
  pre-Cambrian 
  age. 
  

  

  On 
  June 
  11th, 
  1879, 
  1 
  a 
  paper 
  on 
  the 
  pre-Cambrian 
  rocks 
  of 
  

   Shropshire 
  was 
  read 
  by 
  Dr. 
  Callaway 
  before 
  the 
  Geological 
  Society 
  

   in 
  which 
  he 
  grouped 
  them 
  geographically 
  as 
  follows 
  : 
  — 
  

  

  ' 
  A. 
  The 
  Wrekin 
  Group. 
  — 
  Lilleshall 
  Hill, 
  Ercal, 
  Lawrence 
  Hill, 
  

  

  the 
  Wrekin, 
  Primrose 
  Hill. 
  

   ' 
  B. 
  Caer 
  Caradoc 
  Group. 
  — 
  The 
  Lawley, 
  Caer 
  Caradoc, 
  the 
  

  

  Ragleth, 
  Hope 
  Bowdler 
  Hill. 
  

   'C. 
  Horderley 
  Group. 
  

  

  4 
  D. 
  Kington 
  Group.' 
  

  

  He 
  claimed 
  that 
  the 
  granitoid 
  rocks, 
  as 
  at 
  Malvern 
  and 
  St. 
  David's, 
  

   were 
  the 
  oldest, 
  and 
  that 
  they 
  were 
  overlain 
  by 
  the 
  Volcanic 
  Group. 
  

  

  In 
  his 
  ' 
  Notes 
  on 
  the 
  Microscopic 
  Structure 
  of 
  some 
  Shropshire 
  

   Rocks,' 
  read 
  at 
  the 
  same 
  meeting, 
  Prof. 
  Bonney 
  says, 
  p. 
  668 
  : 
  — 
  ' 
  As 
  

   the 
  result 
  of 
  the 
  investigations 
  above 
  described, 
  I 
  should 
  conclude, 
  

   from 
  microsoopic 
  evidence 
  alone, 
  irrespective 
  of 
  that 
  obtained 
  in 
  the 
  

   field, 
  that 
  the 
  granitoid 
  series 
  was 
  much 
  older 
  than 
  the 
  other 
  rocks, 
  

   and 
  that 
  materials 
  from 
  it, 
  together 
  with 
  fragments 
  from 
  the 
  rhyo- 
  

   litic 
  series, 
  had 
  been 
  worked 
  up 
  into 
  several 
  of 
  the 
  later 
  clastic 
  rocks.' 
  

  

  Subsequently 
  Dr. 
  Callaway 
  added 
  fresh 
  areas 
  to 
  those 
  he 
  had 
  

   previously 
  described, 
  and 
  lastly 
  included 
  the 
  Longmynd 
  rocks 
  

   (Cambrian 
  of 
  Murchison) 
  in 
  the 
  pre-Cambrian 
  under 
  the 
  term 
  

   Longmyndian. 
  It 
  is 
  difficult 
  at 
  present 
  to 
  say 
  whether 
  all 
  or 
  only 
  

   a 
  part 
  of 
  the 
  Longmynd 
  rocks, 
  as 
  suggested 
  by 
  Mr. 
  Blake, 
  are 
  of 
  

   pre-Cambrian 
  age, 
  and 
  it 
  is 
  most 
  unfortunate 
  that 
  up 
  to 
  the 
  

   present 
  no 
  important 
  additions 
  to 
  the 
  fauna 
  of 
  these 
  rocks 
  has 
  been 
  

   made 
  since 
  the 
  discovery 
  in 
  them 
  by 
  Mr. 
  Salter 
  of 
  a 
  fragment 
  of 
  a 
  

   trilobite 
  (Palceopyge 
  Ramsay 
  i) 
  and 
  annelid-borings. 
  

  

  1 
  Quart. 
  Journ. 
  Greol. 
  Soc. 
  toL 
  xxxv. 
  p. 
  643. 
  

  

  