﻿ROCKS 
  OF 
  THE 
  LEICESTERSHIRE 
  COAL-FIELD. 
  29 
  

  

  eaton-Hartshill 
  district. 
  The 
  distance 
  from 
  the 
  Hartshill 
  ridge 
  to 
  

   Packington 
  is 
  12 
  miles, 
  and 
  it 
  seems 
  to 
  me 
  that 
  the 
  great 
  an- 
  

   gularity 
  of 
  the 
  breccias 
  in 
  the 
  last-mentioned 
  district 
  is 
  incompatible 
  

   with 
  a 
  water-transit 
  of 
  this 
  extent; 
  and 
  I 
  am 
  confirmed 
  in 
  this 
  

   opinion 
  by 
  Prof. 
  Bonney, 
  who 
  has 
  of 
  late 
  given 
  a 
  considerable 
  

   amount 
  of 
  attention 
  to 
  questions 
  of 
  this 
  nature. 
  Independent 
  evi- 
  

   dence 
  of 
  a 
  more 
  positive 
  kind 
  that 
  the 
  Hartshill 
  Nuneaton 
  outcrop 
  

   is 
  not 
  the 
  exact 
  point 
  of 
  derivation, 
  is 
  afforded 
  by 
  the 
  " 
  strain 
  

   shadows 
  " 
  exhibited 
  by 
  sections 
  of 
  many 
  of 
  the 
  grits 
  and 
  quartzites 
  

   of 
  the 
  breccias. 
  This 
  peculiar 
  optical 
  property 
  of 
  the 
  microscopical 
  

   sections 
  indicates 
  a 
  folded 
  and 
  disturbed 
  state 
  of 
  the 
  parent 
  rock 
  

   from 
  which 
  the 
  Upper 
  Cambrians 
  of 
  the 
  Hartshill 
  district 
  are 
  com- 
  

   paratively 
  free. 
  

  

  Before 
  we 
  can 
  indicate 
  with 
  any 
  probability 
  the 
  approximate 
  

   locality 
  of 
  the 
  rocks 
  from 
  which 
  the 
  Permian 
  breccias 
  have 
  been 
  

   derived, 
  it 
  will 
  be 
  necessary 
  to 
  consider 
  the 
  position 
  of 
  the 
  older 
  

   Palaeozoic 
  rocks 
  beneath 
  the 
  New 
  Red 
  Sandstones 
  and 
  Marls, 
  which 
  

   extend 
  in 
  an 
  unbroken 
  sheet 
  from 
  the 
  Hartshill 
  ridge 
  to 
  Charnwood, 
  

   and 
  to 
  ascertain 
  how 
  far 
  they 
  were 
  stripped 
  of 
  the 
  overlying 
  Car- 
  

   boniferous 
  deposits, 
  and 
  subjected 
  to 
  denudation, 
  in 
  Permian 
  times. 
  

  

  Over 
  a 
  large 
  part 
  of 
  this 
  area, 
  as 
  pointed 
  out 
  by 
  Mr. 
  Harrison 
  

   ('Midland 
  Naturalist,' 
  1885), 
  there 
  can 
  be 
  no 
  doubt 
  that 
  the 
  Trias 
  

   rests 
  directly 
  upon 
  rocks 
  older 
  than 
  the 
  Coal-measures, 
  and 
  this 
  

   fact 
  has 
  been 
  more 
  recently 
  dwelt 
  upon 
  by 
  Mr. 
  Strahan, 
  in 
  his 
  paper 
  

   on 
  the 
  "Hocks 
  beneath 
  the 
  Coal-measures, 
  and 
  around 
  the 
  War- 
  

   wickshire 
  Coal-field 
  " 
  (Geol. 
  Mag. 
  1886). 
  

  

  In 
  the 
  last-mentioned 
  paper 
  particulars 
  are 
  given 
  of 
  a 
  number 
  

   of 
  deep 
  borings 
  through 
  the 
  Trias 
  in 
  search 
  of 
  coal 
  ; 
  but 
  by 
  some 
  

   mischance 
  the 
  record 
  of 
  one 
  of 
  these 
  borings, 
  which 
  for 
  my 
  parti- 
  

   cular 
  purpose 
  is 
  perhaps 
  one 
  of 
  the 
  most 
  important, 
  is 
  erroneously 
  

   given. 
  The 
  boring 
  in 
  question 
  is 
  the 
  one 
  referred 
  to 
  by 
  Mr. 
  Strahan 
  

   (loc. 
  cit.) 
  as 
  the 
  Elmesihorpe 
  boring, 
  and 
  by 
  Mr. 
  W. 
  J. 
  Harrison 
  

   (Midi. 
  Nat. 
  viii. 
  p. 
  163) 
  as 
  the 
  Sapcote 
  boring. 
  Its 
  position 
  is 
  at 
  

   Sapcote 
  Preeholt, 
  halfway 
  between 
  Hinckley 
  and 
  the 
  syenite 
  boss 
  

   of 
  Sapcote. 
  Mr. 
  Strahan 
  gives 
  the 
  following 
  particulars 
  : 
  — 
  

  

  ft. 
  

  

  Drift 
  10 
  

  

  Bed 
  Marl 
  120 
  

  

  Lower 
  Keuper 
  Sandstone 
  ["V^aterstone] 
  330 
  

  

  Slaty 
  rocks 
  with 
  a 
  dip 
  of 
  70°, 
  Lower 
  Silurian 
  ? 
  1 
  195 
  

  

  1655 
  

  

  Mr. 
  Harrison 
  (loc. 
  cit.) 
  gives 
  substantially 
  the 
  same 
  account 
  of 
  the 
  

   boring, 
  and 
  states 
  his 
  conviction 
  that 
  the 
  slaty 
  beds 
  are 
  Stocking- 
  

   ford 
  Shales. 
  

  

  Through 
  the 
  kindness 
  of 
  Mr. 
  J. 
  A. 
  Bosworth, 
  of 
  Leicester, 
  under 
  

   whose 
  superintendence 
  the 
  boring 
  was 
  made, 
  I 
  have 
  been 
  able 
  to 
  

   examine 
  his 
  very 
  carefully 
  prepared 
  section, 
  and 
  also 
  to 
  see 
  some 
  of 
  

   the 
  cores. 
  The 
  following 
  are 
  the 
  details, 
  which, 
  it 
  will 
  be 
  seen, 
  

   differ 
  materially 
  from 
  those 
  given 
  above 
  : 
  — 
  

  

  