﻿Geology 
  and 
  Natural 
  Ilisto7'y. 
  393 
  

  

  of 
  the 
  series, 
  appears 
  in 
  two 
  volumes, 
  each 
  separately 
  paged 
  and 
  

   indexed. 
  The 
  first 
  (pp. 
  651) 
  contains 
  the 
  Metallic 
  Products 
  with 
  

   coal 
  and 
  coke, 
  the 
  second 
  (pp. 
  Y06) 
  Non-metallic 
  Products 
  except 
  

   coal 
  and 
  coke. 
  The 
  value 
  and 
  scope 
  of 
  this 
  report, 
  to 
  which 
  

   many 
  specialists 
  have 
  contributed, 
  are 
  too 
  well 
  known 
  to 
  need 
  

   further 
  comment 
  here. 
  

  

  MoNOGEAPHS 
  : 
  XXXI, 
  Geology 
  of 
  the 
  Aspen 
  Mining 
  District^ 
  

   Colorado^ 
  by 
  Josiah 
  Edwaed 
  Spuee, 
  pp. 
  xxxv, 
  60. 
  With 
  an 
  

   Atlas 
  containing 
  folio 
  plates. 
  This 
  report 
  will 
  be 
  noticed 
  later. 
  

  

  Also 
  XXIX 
  by 
  B. 
  K. 
  Emeeson 
  and 
  XXXI 
  by 
  the 
  late 
  John 
  

   Steong 
  Newbeeey 
  ; 
  both 
  of 
  these 
  are 
  noticed 
  below. 
  

  

  Bulletin, 
  No. 
  162. 
  Bibliography 
  and 
  Index 
  of 
  North 
  Ameri- 
  

   can 
  Geology^ 
  Paleontology, 
  Petrology 
  and 
  Mineralogy 
  for 
  1898, 
  

   by 
  Feed 
  Boughton 
  Weeks. 
  The 
  value 
  of 
  this 
  series 
  is 
  much 
  

   increased 
  by 
  the 
  admirable 
  promptness 
  with 
  which 
  the 
  successive 
  

   numbers 
  appear. 
  

  

  4. 
  Geology 
  of 
  Old 
  Hampshire 
  County^ 
  Massachusetts, 
  compris- 
  

   ing 
  Franklin, 
  Hampshire, 
  and 
  Hampden 
  Counties, 
  by 
  Benjamin 
  

   Kendall 
  Emeeson, 
  pp. 
  l-'782, 
  plates 
  i-xxxv, 
  1898. 
  U. 
  S. 
  

   Geological 
  Survey, 
  Charles 
  D. 
  Walcott, 
  Director. 
  Monograph 
  

   XXIX. 
  — 
  This 
  elaborate 
  description 
  of 
  the 
  geology 
  of 
  central 
  

   Massachusetts 
  was 
  begun 
  in 
  1873, 
  and 
  thus 
  contains 
  the 
  mature 
  

   opinions 
  of 
  the 
  author, 
  based 
  on 
  a 
  detailed 
  study 
  of 
  the 
  region. 
  

   The 
  classification 
  of 
  the 
  rocks, 
  which 
  (except 
  the 
  Triassic 
  sand- 
  

   stone) 
  are 
  crystalline 
  limestones, 
  granite 
  schists, 
  gneisses 
  and 
  

   diabases, 
  is 
  constructed 
  on 
  a 
  chronologic 
  basis. 
  

  

  The 
  following 
  general 
  section 
  of 
  the 
  rocks 
  in 
  the 
  Berkshire 
  hills 
  

   and 
  Connecticut 
  valley 
  will 
  indicate 
  the 
  author's 
  interpretation 
  

   and 
  the 
  names 
  adopted 
  in 
  the 
  report 
  : 
  

   Trias. 
  

  

  Black 
  Rock 
  diabase 
  (intrusive). 
  

  

  Chicopee 
  shale. 
  

  

  Longmeadow 
  sandstone. 
  

  

  Granby 
  tuflT. 
  

  

  Mount 
  Holyoke 
  diabase 
  (interbedded). 
  

  

  Sugar 
  Loaf 
  arkose. 
  

  

  Mount 
  Toby 
  conglomerate. 
  

  

  Unconformity. 
  

   Eruptives, 
  mostly 
  post-Carboniferous. 
  

  

  Granite. 
  

  

  Granitite. 
  

  

  Pegmatite. 
  

  

  Albitic 
  granite. 
  

  

  Tonalite. 
  

   Carboniferous 
  (no 
  representative 
  in 
  the 
  region). 
  

   Devonian. 
  

  

  Bernardston 
  mica-schist. 
  

  

  Bernardston 
  amphibolite. 
  

  

  Bernardston 
  quartzite. 
  

  

  Bernardston 
  limestone. 
  

  

  Yernon 
  gneiss. 
  

  

  Unconformity. 
  

  

  