﻿Geology. 
  515 
  

  

  altered 
  schists 
  not 
  being 
  over 
  0*001 
  mm. 
  in 
  diameter. 
  Moreover, 
  

   well 
  defined 
  single 
  graphite 
  crystals 
  were 
  observed 
  having 
  a 
  

   hexagonal 
  contour. 
  The 
  Rohrsdorf 
  quartzite 
  is 
  still 
  richer 
  in 
  

   graphite, 
  and 
  it 
  is 
  more 
  beautifully 
  crystallized. 
  The 
  rock 
  itself 
  

   is 
  seen 
  under 
  a 
  magnifier 
  to 
  consist 
  essentially 
  of 
  a 
  mixture 
  of 
  

   quartz 
  and 
  graphite, 
  the 
  latter 
  feeling 
  greasy 
  to 
  the 
  touch 
  and 
  

   giving 
  a 
  metallic 
  streak. 
  Some 
  of 
  the 
  crystals 
  were 
  0*3 
  mm. 
  in 
  

   diameter. 
  On 
  chemical 
  analysis, 
  the 
  chiastolite 
  graphite 
  gave 
  

   98-84 
  per 
  cent 
  carbon 
  and 
  0*21 
  per 
  cent, 
  hydrogen 
  ; 
  the 
  quartzite- 
  

   graphite 
  99*94 
  per 
  cent 
  carbon 
  and 
  0*05 
  per 
  cent 
  hydrogen. 
  In 
  

   amount 
  the 
  quartzite 
  contains 
  about 
  2 
  per 
  cent 
  of 
  the 
  graphite, 
  

   its 
  density 
  being 
  from 
  2*62 
  to 
  2-637. 
  — 
  Ber. 
  Berl. 
  Chem. 
  Ges., 
  

   xxiv, 
  1884, 
  June, 
  1891. 
  g. 
  f. 
  b. 
  

  

  3. 
  Geological 
  Survey 
  of 
  Alabama, 
  E. 
  A. 
  Smith, 
  State 
  Geolo- 
  

   gist. 
  Report 
  on 
  the 
  Coal 
  Measures 
  of 
  the 
  Plateau 
  region 
  of 
  

   Alabama, 
  by 
  Henry 
  McCalley, 
  including 
  a 
  report 
  on 
  the 
  Coal 
  

   Measures 
  of 
  Blount 
  County, 
  by 
  A. 
  M. 
  Gibson. 
  238 
  pp. 
  8vo, 
  

   with 
  a 
  map 
  of 
  the 
  Coal-fields 
  and 
  two 
  geological 
  sections 
  across 
  

   the 
  Plateau 
  region. 
  — 
  The 
  Coal-measures 
  of 
  all 
  the 
  Plateau 
  region, 
  

   about 
  4500 
  square 
  miles 
  in 
  area, 
  are 
  here 
  described 
  except 
  those 
  

   of 
  the 
  Warrior 
  Coal-field 
  which 
  were 
  reported 
  upon 
  in 
  1886. 
  

   The 
  region 
  is 
  one 
  of 
  broad 
  gentle 
  undulations 
  in 
  the 
  bedding, 
  and 
  

   is 
  divided 
  by 
  wall-sided 
  valleys 
  which 
  are 
  cut 
  down 
  to 
  the 
  Sub- 
  

   carboniferous 
  and 
  inferior 
  strata. 
  The 
  coal 
  beds 
  belong 
  for 
  the 
  

   larger 
  part 
  to 
  the 
  lower 
  part 
  of 
  the 
  coal-measures 
  and 
  the 
  most 
  

   productive 
  bed, 
  the 
  Main 
  Etna, 
  2 
  to 
  5 
  feet 
  thick, 
  is 
  below 
  the 
  

   Lower 
  Conglomerate 
  or 
  Millstone 
  Grit. 
  Under 
  this 
  there 
  are 
  four 
  

   other 
  beds 
  separated 
  by 
  20 
  to 
  100 
  feet 
  of 
  shale. 
  The 
  Subcar- 
  

   boniferous 
  beds, 
  below 
  the 
  coal-measures, 
  consist 
  of 
  a 
  limestone, 
  

   the 
  probable 
  equivalent 
  of 
  the 
  Chester 
  group, 
  resting 
  on 
  shales 
  

   and 
  sandstone, 
  in 
  all 
  perhaps 
  1000 
  feet 
  in 
  thickness, 
  and 
  under- 
  

   neath 
  these, 
  about 
  400 
  feet 
  of 
  cherty 
  or 
  siliceous 
  limestones. 
  All 
  

   there 
  is 
  of 
  Devonian 
  in 
  Alabama 
  is 
  a 
  stratum 
  of 
  Black 
  shale 
  not 
  

   over 
  10 
  or 
  15 
  feet 
  thick. 
  

  

  4. 
  Geological 
  Survey 
  of 
  3Iissouri, 
  Bulletin 
  JSTo. 
  5, 
  Arthur 
  

   Winslow, 
  State 
  Geologist. 
  86 
  pp., 
  8vo. 
  — 
  This 
  Report 
  contains 
  

   a 
  paper 
  by 
  Erasmus 
  Haworth, 
  on 
  the 
  age 
  and 
  origin 
  of 
  the 
  

   crystalline 
  rocks 
  of 
  Missouri, 
  and 
  another 
  by 
  G. 
  E. 
  Ladd, 
  on 
  the 
  

   clays 
  and 
  building 
  stones 
  of 
  certain 
  western 
  central 
  counties 
  

   tributary 
  to 
  Kansas 
  City, 
  Mr. 
  Haworth 
  concludes 
  that 
  the 
  rocks 
  

   of 
  the 
  iron 
  region, 
  granite 
  and 
  "phorphyry," 
  are 
  of 
  igneous 
  

   origin, 
  and 
  this 
  makes 
  the 
  iron 
  ore 
  deposits 
  also 
  igneous. 
  As 
  

   stated 
  in 
  the 
  Preface 
  to 
  the 
  Report, 
  Pumpelly, 
  in 
  his 
  survey 
  of 
  

   the 
  region, 
  decided 
  that 
  the 
  rocks 
  and 
  ore 
  were 
  metamorphic. 
  

  

  5. 
  Geological 
  Survey 
  of 
  Georgia. 
  First 
  Report 
  of 
  Progress, 
  

   1890-91, 
  by 
  L. 
  W. 
  Spencer, 
  State 
  Geologist. 
  128 
  pp. 
  8vo. 
  — 
  

   This 
  report, 
  after 
  observations 
  on 
  the 
  topography 
  of 
  the 
  State, 
  

   treats 
  of 
  the 
  Cretaceous 
  and 
  Tertiary 
  formations, 
  presents 
  brief 
  er 
  

   notes 
  on 
  the 
  older 
  strata, 
  and 
  gives 
  some 
  account 
  of 
  phosphate 
  

   beds 
  and 
  other 
  mineral 
  materials 
  of 
  economic 
  value. 
  

  

  