﻿26*4 
  PROCEEDINGS 
  OF 
  THE 
  GEOLOGICAL 
  SOCIETY. 
  [Mar. 
  23, 
  

  

  1. 
  Shales 
  ^ 
  

  

  2. 
  Thin 
  -bedded, 
  hard, 
  quartzose 
  sandstones 
  and 
  shales. 
  I 
  B. 
  

   Upcast 
  fault 
  : 
  — 
  f 
  

  

  3. 
  Sandstone 
  and 
  shale 
  J 
  

  

  4. 
  Black 
  shales 
  and 
  thin 
  earthy 
  limestones 
  C. 
  

  

  5. 
  Carboniferous 
  Limestone. 
  

  

  We 
  have 
  nothing 
  that 
  we 
  can 
  safely 
  say 
  belongs 
  to 
  the 
  upper 
  

   group, 
  and 
  certainly 
  no 
  trace 
  of 
  the 
  Yoredale 
  Grit 
  ; 
  that 
  bed 
  has, 
  

   therefore, 
  either 
  thinned 
  out, 
  or 
  passed 
  into 
  a 
  quartzose 
  sandstone 
  

   like 
  those 
  of 
  the 
  middle 
  division. 
  We 
  find 
  in 
  No. 
  1 
  some 
  thin 
  coals, 
  

   a 
  thick 
  bed 
  of 
  Gannister, 
  and 
  limestone-nodules 
  with 
  many 
  fossils, 
  

   all 
  three 
  being 
  most 
  likely 
  local. 
  

  

  The 
  beds 
  in 
  No. 
  2 
  have 
  all 
  the 
  character 
  of 
  the 
  Yoredale 
  Quartzites. 
  

  

  At 
  the 
  bottom 
  of 
  No. 
  3 
  lies 
  a 
  little 
  cannel 
  coal, 
  about 
  a 
  foot 
  in 
  

   thickness. 
  

  

  The 
  series 
  altogether 
  is 
  perhaps 
  not 
  less 
  than 
  2000 
  feet 
  thick. 
  

  

  The 
  Yoredale 
  Quartzites 
  of 
  Gun 
  Hill 
  and 
  the 
  Biddulph 
  Anticlinal 
  

   have 
  been 
  already 
  described. 
  

  

  h. 
  The 
  Pottery, 
  Weiley, 
  and 
  Cheadle 
  Coal-fields. 
  — 
  We 
  have 
  now 
  

   reached 
  the 
  southern 
  limit 
  of 
  the 
  country 
  under 
  consideration, 
  where 
  

   the 
  Carboniferous 
  rocks 
  begin 
  to 
  be 
  covered 
  up 
  by 
  the 
  New 
  Red 
  

   Sandstone 
  of 
  the 
  central 
  plain 
  of 
  England 
  ; 
  and 
  the 
  section 
  below 
  

   (fig. 
  9) 
  is 
  the 
  last 
  to 
  which 
  we 
  shall 
  have 
  to 
  call 
  attention. 
  

  

  Position 
  of 
  Rocks 
  at 
  the 
  surface. 
  — 
  This 
  section 
  starts 
  on 
  the 
  east- 
  

   ern 
  edge 
  of 
  the 
  Pottery 
  Coal-field, 
  shows 
  the 
  outcrop 
  of 
  the 
  two 
  

   beds, 
  which 
  are 
  now 
  all 
  that 
  is 
  left 
  of 
  the 
  Millstone-grit, 
  and 
  then 
  

   crosses 
  an 
  anticlinal 
  of 
  Yoredale 
  Rocks, 
  beyond 
  which 
  lies 
  the 
  little 
  

   Coal-field 
  of 
  Wetley, 
  the 
  southern 
  end 
  of 
  the 
  Rudyerd 
  Basin. 
  This 
  

   basin 
  is 
  here 
  bounded 
  on 
  the 
  east 
  by 
  a 
  fault, 
  which 
  we 
  take 
  to 
  be 
  

   the 
  continuation 
  of 
  the 
  Anticlinal 
  Fault 
  ;' 
  beyond 
  this 
  the 
  beds 
  roll 
  

   over, 
  and 
  form 
  the 
  gentle 
  synclinal 
  of 
  the 
  Cheadle 
  Coal-field, 
  which, 
  

   lying 
  as 
  it 
  does 
  on 
  the 
  line 
  of 
  the 
  axis 
  of 
  the 
  Goyt 
  Trough, 
  may 
  

   well 
  be 
  looked 
  upon 
  as 
  one 
  of 
  the 
  lesser 
  basins 
  of 
  that 
  great 
  hollow. 
  

  

  Petrological 
  details. 
  Millstone-grit. 
  — 
  We 
  have 
  seen 
  that 
  in 
  the 
  

   district 
  last 
  described 
  the 
  Millstone-grit 
  had 
  come 
  down 
  to 
  two 
  

   beds 
  only, 
  the 
  first 
  and 
  the 
  third 
  ; 
  these 
  run 
  on 
  over 
  the 
  whole 
  of 
  

   the 
  present 
  district, 
  but 
  no 
  longer 
  with 
  that 
  marked 
  character 
  and 
  

   bold 
  look 
  which 
  made 
  it 
  so 
  easy 
  to 
  recognize 
  and 
  trace 
  them 
  further 
  

   to 
  the 
  north. 
  They 
  have 
  become 
  changeable, 
  and 
  upon 
  the 
  whole 
  

   much 
  finer, 
  softer 
  and 
  less 
  striking 
  ; 
  here 
  and 
  there, 
  however, 
  they 
  

   seem 
  for 
  a 
  time 
  to 
  recover 
  their 
  coarse 
  and 
  massive 
  nature, 
  and 
  this 
  

   is 
  especially 
  the 
  case 
  with 
  the 
  Third 
  Grit, 
  which 
  still 
  at 
  times 
  shows 
  

   fine 
  escarpments, 
  as 
  in 
  the 
  defile 
  cut 
  through 
  it 
  between 
  Cotton 
  and 
  

   Oakamoor, 
  round 
  the 
  village 
  of 
  Uoxt, 
  and 
  about 
  a 
  mile 
  west 
  of 
  

   Ipstones. 
  These, 
  however, 
  are 
  exceptions, 
  not 
  the 
  rule. 
  

  

  At 
  the 
  south-west 
  corner 
  of 
  the 
  Cheadle 
  Coal-field 
  the 
  third 
  bed, 
  

   if 
  not 
  actually 
  gone, 
  has 
  so 
  fallen 
  off 
  in 
  thickness 
  that 
  we 
  may 
  look 
  

   upon 
  it 
  as 
  on 
  the 
  point 
  of 
  thinning 
  away 
  altogether. 
  Unluckily 
  the 
  

   country 
  is 
  much 
  covered 
  up 
  by 
  drift, 
  but 
  at 
  the 
  last 
  point 
  where 
  the 
  

  

  