﻿ROCKS 
  OF 
  THE 
  LEICESTERSHIRE 
  COAL-FIELD. 
  35 
  

  

  The 
  influence 
  of 
  these 
  Pre-Permian 
  movements 
  is 
  observable 
  

   from 
  the 
  South-Staffordshire 
  Coal-field 
  to 
  Ch&rnwood 
  Forest 
  ; 
  and, 
  

   through 
  the 
  Leicestershire 
  Coal-field 
  and 
  the 
  exposure 
  of 
  Lower 
  Car- 
  

   boniferous 
  rocks 
  at 
  Kirk 
  Langley, 
  the 
  disturbance 
  can 
  be 
  connected 
  

   with 
  the 
  great 
  Pennine 
  axis, 
  to 
  the 
  southerly 
  extension 
  of 
  which 
  they 
  

   doubtless 
  owe 
  their 
  origin 
  ; 
  consequently 
  the 
  Permian 
  beds 
  we 
  are 
  

   considering 
  afford 
  indirect 
  proof 
  of 
  the 
  correctness 
  of 
  the 
  view 
  of 
  

   Mr. 
  E. 
  Wilson 
  and 
  Mr. 
  J. 
  J. 
  H. 
  Teall 
  as 
  to 
  the 
  Pre-Permian 
  age 
  of 
  

   the 
  Pennine 
  axis. 
  

  

  (5) 
  Correlation 
  of 
  the 
  Beds, 
  and 
  a 
  Consideration 
  of 
  the 
  Physical 
  

   Conditions 
  under 
  which 
  they 
  were 
  deposited. 
  

  

  On 
  the 
  extreme 
  north 
  of 
  the 
  Warwickshire 
  Coal-field, 
  about 
  six 
  

   miles 
  S.S.W. 
  of 
  the 
  most 
  southerly 
  exposures 
  of 
  the 
  Permians 
  of 
  the 
  

   Leicestershire 
  Coal-field, 
  there 
  occurs, 
  near 
  Polesworth, 
  an 
  outcrop 
  

   of 
  Permian 
  rocks, 
  consisting 
  of 
  consolidated 
  calcareous 
  breccia 
  and 
  

   buff-coloured 
  sandstone, 
  the 
  latter 
  underlying 
  the 
  former. 
  The 
  

   breccia, 
  to 
  which 
  reference 
  has 
  been 
  already 
  made, 
  immediately 
  

   underlies 
  the 
  Bunter 
  Conglomerate, 
  and 
  is 
  apparently 
  from 
  200 
  to 
  

   300 
  ft. 
  thick. 
  From 
  its 
  general 
  appearance, 
  and 
  from 
  the 
  nature 
  of 
  

   its 
  included 
  fragments 
  (see 
  p. 
  24), 
  there 
  can 
  be 
  no 
  doubt 
  that 
  it 
  is 
  

   identical 
  with 
  the 
  brecciated 
  rocks 
  overlying 
  the 
  Coal-measures 
  of 
  

   the 
  Leicestershire 
  Coal-field 
  to 
  the 
  north 
  ; 
  and 
  as 
  the 
  buff- 
  coloured 
  

   sandstones 
  are 
  exactly 
  similar 
  to 
  the 
  characteristic 
  Permian 
  sand- 
  

   stones 
  which 
  I 
  have 
  described 
  as 
  occurring 
  at 
  Swadlincote 
  and 
  

   Caulkley 
  Wood, 
  the 
  Polesworth 
  rocks 
  are 
  doubtless 
  southern 
  ex- 
  

   tensions, 
  in 
  a 
  more 
  massive 
  form, 
  of 
  the 
  Permians 
  which 
  occur 
  in 
  

   the 
  Leicestershire 
  Coal-field 
  as 
  comparatively 
  thin, 
  marginal 
  deposits. 
  

   On 
  the 
  other 
  hand, 
  the 
  Permians 
  of 
  Warwickshire 
  can 
  be 
  directly 
  

   correlated 
  with 
  those 
  of 
  South 
  Staffordshire 
  by 
  the 
  aid 
  of 
  various 
  

   exposures 
  between 
  the 
  northern 
  extremities 
  of 
  the 
  South-Stafford- 
  

   shire 
  and 
  Warwickshire 
  Coal-fields 
  : 
  so 
  that 
  we 
  are 
  justified 
  in 
  

   regarding 
  the 
  Permian 
  rocks 
  of 
  these 
  districts, 
  and 
  of 
  the 
  Leices- 
  

   tershire 
  Coal-field, 
  as 
  belonging 
  to 
  the 
  same 
  area 
  of 
  deposition, 
  and 
  

   as 
  forming 
  a 
  part 
  of 
  the 
  detrital 
  deposits 
  of 
  the 
  great 
  Permian 
  lake, 
  

   which 
  extended 
  northwards 
  from 
  Warwickshire 
  and 
  Worcestershire, 
  

   and 
  the 
  margin 
  of 
  which 
  was 
  the 
  Pennine 
  Chain. 
  

  

  There 
  is, 
  however, 
  one 
  important 
  fact 
  which 
  remains 
  to 
  be 
  

   noticed. 
  In 
  the 
  Warwickshire 
  district 
  (and 
  I 
  believe 
  also 
  in 
  that 
  

   of 
  South 
  Staffordshire) 
  the 
  break 
  between 
  the 
  Coal-measures 
  and 
  

   Permian 
  is 
  very 
  much 
  less 
  than 
  it 
  is 
  in 
  the 
  Leicestershire 
  Coal-field 
  ; 
  

   in 
  fact, 
  according 
  to 
  most 
  observers, 
  there 
  is, 
  in 
  the 
  former 
  district, 
  

   almost 
  an 
  unbroken 
  stratigraphical 
  succession 
  from 
  the 
  Upper 
  Coal- 
  

   measures, 
  with 
  their 
  #prorfo's-Limestone, 
  into 
  the 
  Permian. 
  This 
  

   striking 
  difference 
  in 
  unconformity 
  in 
  areas 
  so 
  near 
  to 
  each 
  other 
  

   can, 
  I 
  think, 
  be 
  explained 
  by 
  the 
  fact 
  that 
  the 
  Leicestershire 
  Coal- 
  

   field, 
  where 
  the 
  greatest 
  stratigraphical 
  break 
  takes 
  place, 
  is 
  almost 
  

   directly 
  on 
  the 
  line 
  of 
  the 
  Pennine-Charnwood 
  axis, 
  along 
  which 
  the 
  

  

  d2 
  

  

  