﻿ROCKS 
  OP 
  THE 
  LEICESTERSHIRE 
  COAL-FIELD. 
  13 
  

  

  A 
  little 
  west 
  of 
  the 
  Decoy 
  Wood 
  at 
  Bretby 
  occurs 
  a 
  fault 
  running 
  

   in 
  a 
  south 
  south-easterly 
  direction, 
  with 
  a 
  downthrow 
  to 
  the 
  east, 
  and 
  

   bringing 
  down 
  the 
  Triassic 
  rocks 
  against 
  the 
  Coal-measures, 
  thus 
  

   forming 
  the 
  boundary 
  of 
  the 
  Coal-field 
  for 
  the 
  distance 
  of 
  about 
  a 
  

   mile. 
  This 
  is 
  the 
  Moira 
  Main 
  Fault, 
  which 
  has 
  been 
  proved 
  between 
  

   JNewhall 
  and 
  Bretby 
  to 
  throw 
  the 
  Coal-measures 
  to 
  the 
  extent 
  of 
  

   240 
  ft. 
  Like 
  all 
  the 
  other 
  great 
  lines 
  of 
  fracture 
  of 
  this 
  district 
  

   which 
  run 
  in 
  a 
  direction 
  approximately 
  N.JST.W. 
  and 
  S.S.E., 
  the 
  

   principal 
  movement 
  occurred 
  in 
  Pre-Permian 
  times 
  ; 
  but 
  considerable 
  

   movement 
  has 
  also 
  taken 
  place 
  along 
  this 
  particular 
  fault 
  in 
  Post- 
  

   Triassic 
  times, 
  and 
  has 
  resulted 
  in 
  the 
  natural 
  boundary 
  of 
  the 
  Trias 
  

   and 
  Coal-measures 
  being 
  moved 
  considerably 
  to 
  the 
  south-east, 
  the 
  

   general 
  direction 
  of 
  dip 
  of 
  the 
  upper 
  measures 
  being 
  about 
  JST.W. 
  

  

  Hartshorn. 
  — 
  About 
  one 
  mile 
  north-west 
  of 
  the 
  village 
  of 
  Hartshorn 
  

   the 
  junction 
  of 
  the 
  Trias 
  and 
  Coal-measures 
  is 
  again 
  one 
  of 
  ordinary 
  

   superposition, 
  and 
  the 
  Survey 
  map 
  indicates 
  the 
  existence 
  of 
  a 
  

   Y-shaped 
  patch 
  of 
  Permian 
  of 
  considerable 
  extent, 
  skirting 
  the 
  base 
  

   of 
  the 
  Conglomerate 
  hills, 
  and 
  stretching 
  from 
  Ley 
  Wood 
  Hill 
  on 
  

   the 
  west, 
  and 
  Caulkley 
  Wood 
  on 
  the 
  east, 
  with 
  the 
  point 
  of 
  the 
  Y 
  

   extending 
  down 
  the 
  valley 
  of 
  the 
  Hartshorn 
  brook 
  as 
  far 
  as 
  Bretby 
  

   Mill. 
  The 
  Survey 
  Memoir 
  (p. 
  58) 
  refers 
  to 
  these 
  exposures 
  as 
  con- 
  

   sisting 
  of 
  loose 
  breccias 
  and 
  marls, 
  but 
  states 
  that 
  " 
  not 
  much 
  faith 
  

   is 
  to 
  be 
  put 
  in 
  the 
  Permian 
  age 
  of 
  these 
  beds." 
  Mr. 
  Molyneux, 
  in 
  

   his 
  'History 
  of 
  Burton-on-Trent,' 
  p. 
  153, 
  gives 
  a 
  very 
  confused 
  

   account 
  of 
  both 
  their 
  appearance 
  and 
  stratigraphical 
  position 
  ; 
  and 
  

   whilst 
  referring 
  them 
  to 
  Upper 
  Coal-measures, 
  describes 
  as 
  Permian 
  

   certain 
  overlying 
  sandstones 
  which 
  are 
  undoubtedly 
  Triassic. 
  My 
  

   own 
  observations 
  in 
  this 
  locality 
  are 
  as 
  follows 
  : 
  — 
  

  

  At 
  Glover's 
  Mill 
  the 
  Bunter 
  Conglomerate 
  of 
  Moxon's 
  Hill 
  rests 
  

   directly 
  upon 
  Coal-measures, 
  as 
  was 
  proved 
  by 
  running 
  a 
  line 
  of 
  

   borings 
  down 
  the 
  eastern 
  slope 
  of 
  the 
  hill 
  towards 
  the 
  brook 
  ; 
  but 
  

   on 
  following 
  the 
  line 
  of 
  junction 
  northwards 
  for 
  about 
  250 
  yds. 
  a 
  

   bed 
  of 
  purple 
  marl 
  was 
  found 
  insinuating 
  itself 
  as 
  a 
  w 
  r 
  edge-shaped 
  

   outcrop 
  between 
  the 
  Bunter 
  and 
  the 
  Carboniferous. 
  A 
  little 
  further 
  

   north, 
  at 
  Hoofies 
  Wood, 
  this 
  bed 
  of 
  marl 
  has 
  gradually 
  thickened 
  to 
  

   about 
  20 
  ft., 
  and 
  is 
  well 
  exposed 
  in 
  a 
  small 
  marl-pit 
  on 
  the 
  eastern 
  

   side 
  of 
  the 
  wood, 
  near 
  the 
  little 
  bridge. 
  Here 
  are 
  seen 
  from 
  12 
  to 
  

   15 
  ft. 
  of 
  deep 
  purple 
  marls, 
  with 
  some 
  light-yellow, 
  sandy 
  bands 
  of 
  

   from 
  1\ 
  to 
  2 
  inches 
  in 
  thickness. 
  About 
  the 
  middle 
  of 
  the 
  section 
  

   is 
  a 
  thin 
  bed 
  of 
  consolidated 
  breccia 
  of 
  from 
  8 
  to 
  9 
  inches. 
  

  

  A 
  few 
  hundred 
  yards 
  further 
  down 
  the 
  brook, 
  about 
  30 
  yds. 
  south- 
  

   west 
  of 
  Bugley 
  Cottage, 
  there 
  can 
  be 
  seen, 
  in 
  the 
  banks, 
  unconsolidated 
  

   breccias 
  and 
  red 
  and 
  variegated 
  clays 
  overlying 
  Coal-measure 
  shales. 
  

  

  These 
  beds 
  of 
  the 
  Hartshorn 
  brook, 
  both 
  from 
  their 
  stratigraphical 
  

   position 
  and 
  their 
  lithological 
  characters, 
  may 
  with 
  the 
  greatest 
  

  

  to 
  the 
  sinking 
  which 
  is 
  now 
  known 
  as 
  the 
  " 
  Netherseal 
  Colliery," 
  and 
  which 
  

   originally 
  ^as 
  named 
  the 
  " 
  Coton 
  Park," 
  and 
  afterwards 
  the 
  "West 
  Moira" 
  pit. 
  

   Here, 
  again, 
  beds 
  which 
  we 
  now 
  know 
  to 
  be 
  Permian 
  have 
  been 
  classed 
  erroneously 
  

   with 
  the 
  Coal-measures. 
  

  

  