﻿ROCKS 
  OF 
  THE 
  LEICESTERSHIRE 
  COAL-FIELD. 
  

  

  33 
  

  

  the 
  Cowpasture 
  boring 
  the 
  Permian 
  breccias 
  rest 
  directly 
  on 
  the 
  

   Stockingford 
  Shales), 
  we 
  have, 
  in 
  the 
  northern 
  part 
  of 
  this 
  ridge 
  of 
  

   old 
  rocks 
  a 
  very 
  probable 
  source 
  of 
  the 
  angular 
  fragments 
  occurring 
  

   in 
  the 
  Permian 
  beds 
  five 
  or 
  six 
  miles 
  to 
  the 
  north-west. 
  

  

  There 
  is 
  another 
  fact 
  in 
  favour 
  of 
  this 
  view 
  which 
  we 
  must 
  not 
  

   lose 
  sight 
  of. 
  The 
  Stockingford 
  Shales 
  pierced 
  at 
  Market 
  Bosworth, 
  

   unlike 
  the 
  beds 
  of 
  the 
  same 
  age 
  near 
  Nuneaton, 
  are 
  much 
  contorted 
  

   and 
  slickensided, 
  and 
  even 
  show 
  signs 
  of 
  cleavage. 
  We 
  have 
  seen 
  

   that 
  there 
  are 
  microscopical 
  indications 
  of 
  the 
  fragments 
  from 
  the 
  

   Permian 
  breccias 
  having 
  been 
  subjected 
  to 
  considerable 
  pressure 
  and 
  

   strain, 
  such 
  as 
  might 
  be 
  expected 
  from 
  rocks 
  exhibiting 
  the 
  above 
  

   general 
  appearances. 
  The 
  horizontal 
  section 
  (fig. 
  6) 
  shows, 
  in 
  a 
  

   diagrammatic 
  form, 
  the 
  probable 
  position 
  of 
  the 
  older 
  rocks 
  beneath 
  

   the 
  Trias 
  along 
  a 
  line 
  drawn 
  from 
  Nuneaton 
  to 
  Charnwood 
  Eorest. 
  

  

  In 
  addition 
  to 
  the 
  hidden 
  anticlinal 
  of 
  the 
  older 
  Palaeozoics 
  just 
  

   referred 
  to, 
  the 
  shaft 
  of 
  the 
  Lindridge 
  Colliery, 
  about 
  half 
  a 
  mile 
  

   north 
  of 
  Desford, 
  has 
  afforded 
  evidence 
  of 
  still 
  another 
  fold 
  between 
  

   the 
  Market 
  Bosworth 
  axis 
  and 
  Charnwood 
  * 
  ; 
  so 
  that, 
  taking 
  all 
  the 
  

   facts 
  into 
  consideration, 
  we 
  have 
  ample 
  proof 
  that 
  the 
  dominant 
  

   N.N.W. 
  and 
  S.S.E. 
  folding 
  of 
  the 
  older 
  rocks 
  is 
  continued 
  between 
  

   Nuneaton 
  and 
  Charnwood, 
  underneath 
  the 
  Triassic 
  plain, 
  which 
  is 
  

   bounded 
  by 
  the 
  Ashby 
  Coal-field 
  on 
  the 
  north, 
  the 
  Warwickshire 
  

   Coal-field 
  on 
  the 
  west, 
  the 
  Liassic 
  escarpment 
  on 
  the 
  south, 
  and 
  

   by 
  Charnwood 
  Forest 
  on 
  the 
  east. 
  

  

  So 
  exact 
  is 
  the 
  parallelism 
  of 
  the 
  major 
  foldings 
  and 
  the 
  principal 
  

   system 
  of 
  faultings 
  in 
  the 
  Leicestershire 
  Coal-field 
  with 
  the 
  folding 
  

   in 
  what 
  we 
  may 
  term 
  the 
  Nuneaton-Charnwood 
  area, 
  that 
  it 
  is 
  im- 
  

   possible 
  to 
  doubt 
  that 
  the 
  general 
  trend 
  of 
  the 
  rocks 
  in 
  the 
  two 
  con- 
  

   tiguous 
  areas 
  has 
  been 
  brought 
  about 
  by 
  the 
  same 
  series 
  of 
  earth- 
  

   movements. 
  

  

  That 
  the 
  age 
  of 
  these 
  movements 
  f 
  is, 
  in 
  the 
  main, 
  Post-Carboni- 
  

   ferous 
  is 
  beyond 
  doubt, 
  for 
  we 
  find 
  both 
  the 
  older 
  Palaeozoics 
  and 
  

   the 
  Carboniferous 
  rocks 
  equally 
  affected 
  by 
  them 
  ; 
  but 
  whilst 
  in 
  the 
  

   Nuneaton-Charnwood 
  area 
  we 
  have 
  nothing, 
  so 
  far 
  as 
  I 
  know, 
  which 
  

   fixes 
  more 
  definitely 
  the 
  age 
  of 
  these 
  flexures, 
  we 
  have, 
  on 
  the 
  other 
  

   hand, 
  a 
  valuable 
  chronological 
  index 
  in 
  the 
  thin 
  Permian 
  beds 
  of 
  

   the 
  Leicestershire 
  Coal-field 
  ; 
  for 
  the 
  non-participation 
  of 
  these 
  strata 
  

   in 
  the 
  general 
  folding 
  of 
  the 
  older 
  rocks, 
  and 
  the 
  undisturbed 
  

   way 
  in 
  which 
  they 
  lie, 
  bridging 
  over 
  the 
  great 
  N.N.W. 
  and 
  S.S.E. 
  

   faults, 
  proves 
  the 
  age 
  of 
  the 
  disturbances 
  to 
  be 
  Pre-Permian. 
  

  

  * 
  Mr. 
  Bosworth 
  informs 
  me 
  that 
  two 
  borings 
  and 
  a 
  shaft 
  have 
  been 
  sunk 
  at 
  

   Lindridge. 
  In 
  the 
  first 
  boring, 
  after 
  passing 
  through 
  from 
  370 
  to 
  380 
  feet 
  of 
  

   hard 
  brown 
  and 
  red 
  Keuper 
  sandstone, 
  a 
  rock 
  was 
  reached 
  which 
  is 
  described 
  

   as 
  syenite. 
  In 
  the 
  second 
  boring, 
  about 
  half 
  a 
  mile 
  further 
  west, 
  Coal-measures 
  

   were 
  struck 
  and 
  coal 
  actually 
  found. 
  The 
  shaft 
  was 
  ultimately 
  sunk 
  three 
  

   quarters 
  of 
  a 
  mile 
  east 
  of 
  the 
  second 
  boring, 
  and, 
  by 
  a 
  curious 
  chance, 
  came 
  

   down 
  exactly 
  upon 
  a 
  very 
  sharply 
  faulted 
  anticlinal, 
  with 
  Coal-measures 
  dip- 
  

   ping 
  away 
  to 
  the 
  west 
  and 
  syenite 
  to 
  the 
  east. 
  

  

  t 
  The 
  forces 
  which 
  brought 
  about 
  the 
  cleavage 
  of 
  the 
  Charnwood 
  rocks, 
  

   although 
  acting 
  along 
  nearly 
  the 
  same 
  lines 
  as 
  the 
  Post-Carboniferous 
  disturb- 
  

   ances, 
  must 
  be 
  of 
  vastly 
  earlier 
  date. 
  

  

  Q. 
  J. 
  G. 
  S. 
  No. 
  177. 
  d 
  

  

  