﻿502 
  Geological 
  Society: 
  — 
  

  

  so 
  /(f) 
  tends 
  to 
  a 
  finite 
  limit 
  as 
  f-^<*> 
  . 
  Thus 
  we 
  

  

  finite, 
  and 
  

   obtain 
  finally 
  

  

  These 
  

  

  

  I{./i»-/l»)^}^ 
  

  

  !/(?)-/(*) 
  

  

  (4) 
  

  

  (5) 
  

  

  in 
  

  

  Mr 
  ' 
  ' 
  

  

  tegrals, 
  which 
  express 
  w; 
  as 
  a 
  function 
  o£ 
  f, 
  may 
  

  

  < 
  _ 
  ) 
  7 
  — 
  j, 
  

  

  be 
  evaluated 
  by 
  the 
  method 
  of 
  residues, 
  and 
  the 
  elimination 
  

   of 
  f 
  between 
  (1) 
  and 
  the 
  results 
  give 
  w 
  as 
  a 
  function 
  of 
  z, 
  as 
  

   is 
  required. 
  

  

  Loughborough, 
  

  

  March 
  5, 
  1918. 
  

  

  LXIL 
  Proceedings 
  of 
  Learned 
  Societies. 
  

  

  GEOLOGICAL 
  SOCIETY. 
  

   [Continued 
  from 
  p. 
  292.] 
  

  

  January 
  9th, 
  1918.— 
  Dr. 
  Alfred 
  Harker, 
  E.E.S., 
  President, 
  

   in 
  the 
  Chair. 
  

   ^THHE 
  following 
  communication 
  was 
  read 
  : 
  — 
  

  

  'The 
  Highest 
  Silurian 
  Rocks 
  of 
  the 
  Clun 
  Forest 
  District 
  

   (Shropshire).' 
  By 
  Laurence 
  Dudley 
  Stamp, 
  B.Sc, 
  A.K.C.L. 
  

  

  Clun 
  Forest 
  is 
  a 
  large 
  district 
  — 
  extending 
  on 
  both 
  sides 
  of 
  the 
  

   Welsh 
  Border 
  — 
  in 
  which 
  Upper 
  Silurian 
  rocks 
  crop 
  out 
  over 
  a 
  wide 
  

   area, 
  interrupted 
  by 
  outliers 
  of 
  Old 
  Bed 
  Sandstone. 
  The 
  district 
  

   is 
  separated 
  from 
  the 
  typical 
  Silurian 
  area 
  of 
  Ludlow, 
  which 
  lies 
  

   some 
  15 
  miles 
  away 
  to 
  the 
  east, 
  by 
  the 
  great 
  line 
  of 
  disturbance 
  

   that 
  passes 
  through 
  Church 
  Stretton 
  and 
  Old 
  Radnor. 
  

  

  The 
  classification 
  adopted 
  for 
  the 
  highest 
  Silurian 
  strata 
  is 
  as 
  

   follows 
  :— 
  Thickness 
  

  

  in 
  feet. 
  

  

  Old 
  Bed 
  Sandstone 
  Purplish-red 
  sandstones. 
  

  

  Temeside 
  Shales 
  350 
  Olive-green 
  shales 
  with 
  bands 
  

  

  of 
  micaceous 
  green 
  grit 
  ; 
  a 
  

   fragment-bed, 
  with 
  Eury- 
  

   Temeside 
  J 
  pterid- 
  and 
  plant-remains, 
  

  

  Group, 
  forms 
  the 
  upper 
  limit. 
  

  

  Yellow 
  sandstones 
  and 
  tile- 
  

   stones, 
  with 
  shales 
  and 
  

   PlatyscMsma 
  Limestones. 
  

   Green 
  laminated 
  flags 
  and 
  blue 
  

  

  flagstones. 
  

   Irregularly-bedded 
  calcareous 
  

  

  flagstones. 
  

   Grey 
  calcareous 
  flags 
  with 
  

  

  massive 
  blue 
  flagstones. 
  

   Striped 
  laminated 
  shales 
  and 
  

   mudstones. 
  

  

  Downton 
  Castle 
  Sandstone 
  110 
  

   Series. 
  

  

  50 
  

  

  300 
  

  

  f 
  f 
  Upper 
  

  

  Chonetes 
  Beds< 
  x 
  

  

  Lower 
  

  

  1 
  I 
  

  

  | 
  Rhy 
  i 
  ichonella 
  Beds 
  300 
  

  

  I 
  

  

  Atmestry 
  f 
  Dayia 
  Shales 
  ? 
  300 
  

  

  Group. 
  \ 
  

  

  Upper 
  

   Ludlow 
  

   Group. 
  

  

  Lower 
  Ludlow 
  Shales 
  Dark 
  - 
  grey 
  shales 
  and 
  indu- 
  

  

  rated 
  mudstones. 
  

  

  Total 
  1410 
  

  

  