﻿160 
  Scientific 
  Intelligence. 
  

  

  known 
  facts 
  regarding 
  the 
  phosphate 
  deposits 
  in 
  Arkansas. 
  They 
  

   appear 
  to 
  be 
  restricted 
  in 
  this 
  region 
  to 
  the 
  interval 
  between 
  

   Lower 
  Paleozoic 
  rocks 
  and 
  the 
  Carboniferous, 
  occupied 
  also 
  in 
  part 
  

   by 
  the 
  black 
  shale, 
  which 
  has 
  been 
  considered 
  to 
  be 
  of 
  Devonian 
  

   age. 
  The 
  author 
  concludes 
  that 
  " 
  we 
  are 
  reduced 
  to 
  the 
  neces- 
  

   sity 
  of 
  believing 
  that 
  this 
  interval, 
  with 
  its 
  phosphate-deposits, 
  

   represents 
  the 
  slow 
  accumulation 
  of 
  organic 
  matter 
  over 
  a 
  com- 
  

   paratively 
  deep 
  sea 
  (not 
  abysmal, 
  however) 
  during 
  the 
  upper 
  

   Silurian 
  and 
  Devonian 
  periods." 
  

  

  Mr. 
  C. 
  W. 
  Hayes 
  has 
  already 
  discussed 
  the 
  similar 
  phosphate 
  

   deposits 
  occurring 
  in 
  the 
  same 
  interval 
  in 
  the 
  central 
  Tennessee 
  

   rocks.* 
  

  

  It 
  may 
  be 
  observed 
  that 
  the 
  presence 
  of 
  rolled 
  and 
  rounded 
  

   pieces 
  of 
  fish 
  bones, 
  fragments 
  of 
  osseous 
  plates 
  that 
  were 
  \ 
  to 
  | 
  

   in. 
  thick, 
  which 
  occur 
  among 
  these 
  phosphate 
  nodules 
  both 
  in 
  

   Arkansas 
  and 
  in 
  Eastern 
  Kentucky, 
  as 
  known 
  to 
  the 
  writer 
  of 
  this 
  

   note, 
  fix 
  the 
  age 
  of 
  the 
  deposit 
  as 
  not 
  earlier 
  than 
  the 
  Devonian 
  era. 
  

  

  h. 
  s. 
  w. 
  

  

  10. 
  Die 
  Leitfossilien, 
  ein 
  Handbuch 
  fur 
  den 
  Unlerricht 
  und 
  

   fur 
  das 
  Bestimmen 
  von 
  Versteinerungen 
  y 
  von 
  Ernest 
  Koken, 
  pp. 
  

   1-848, 
  with 
  nearly 
  900 
  figures. 
  Leipzig, 
  1896 
  (Tauchnitz). 
  — 
  This 
  

   elaborate 
  treatise 
  must 
  prove 
  of 
  great 
  value 
  to 
  students 
  of 
  

   paleontology 
  in 
  Germany 
  in 
  facilitating 
  the 
  determination 
  of 
  

   fossils 
  in 
  the 
  laboratory. 
  But 
  the 
  fact 
  that 
  the 
  characteristic 
  

   fossils 
  are 
  European 
  species, 
  and 
  from 
  European 
  faunas 
  will 
  pre- 
  

   vent 
  American 
  students 
  from 
  getting 
  from 
  it 
  the 
  help 
  they 
  might 
  

   otherwise 
  gain. 
  Still, 
  the 
  analyses 
  made 
  of 
  the 
  characters 
  pre- 
  

   sented 
  by 
  the 
  fossils 
  of 
  each 
  grand 
  division 
  of 
  invertebrates 
  dis- 
  

   cussed 
  and 
  the 
  orderly 
  listing 
  and 
  description 
  of 
  the 
  characteris- 
  

   tics 
  of 
  the 
  fossil 
  faunas 
  of 
  Europe, 
  will 
  render 
  the 
  work 
  of 
  value 
  

   in 
  the 
  American 
  laboratory 
  of 
  paleontology 
  whenever 
  compara- 
  

   tive 
  geology 
  is 
  studied. 
  

  

  The 
  volume 
  is 
  composed 
  of 
  two 
  parts 
  : 
  the 
  first 
  " 
  Palaontolo- 
  

   gische 
  Uebersicht," 
  gives 
  general 
  descriptions 
  of 
  the 
  characters 
  of 
  

   fossils 
  of 
  the 
  chief 
  invertebrate 
  types, 
  followed 
  by 
  analytical 
  tables 
  

   of 
  families 
  and 
  genera. 
  The 
  second 
  part 
  is 
  " 
  Die 
  Leitlossilien," 
  in 
  

   which 
  the 
  genera 
  are 
  given 
  under 
  each 
  class 
  for 
  each 
  era, 
  and 
  the 
  

   characteristic 
  species 
  of 
  each 
  genus 
  selected 
  are 
  distinguished 
  

   from 
  each 
  other 
  by 
  analytical 
  descriptions 
  and 
  tables, 
  thus 
  bring- 
  

   ing 
  out 
  with 
  great 
  distinctness 
  the 
  prominent 
  observed 
  features 
  

   ot 
  the 
  characteristic 
  fossils 
  of 
  each 
  horizon. 
  h. 
  s. 
  w. 
  

  

  11. 
  TIeber 
  die 
  neue 
  geologische 
  Uebersicht 
  skarte 
  der 
  Schweiz. 
  

   1 
  : 
  500,000 
  ; 
  von 
  C. 
  Schmidt. 
  Extract 
  from 
  Compte-rendus 
  in 
  

   Congres 
  geologique 
  international 
  6th 
  Session, 
  1894, 
  Zurich, 
  pp. 
  

   352-360). 
  — 
  This 
  brief 
  report 
  gives 
  detailed 
  account 
  of 
  the 
  classi- 
  

   fication 
  adopted 
  for 
  the 
  series 
  of 
  deposits 
  from 
  the 
  Alluvium 
  to 
  

   the 
  Devonian 
  and 
  of 
  the 
  crystalline 
  rocks. 
  

  

  12. 
  The 
  ancient 
  volcanic 
  rocks 
  of 
  South 
  Mt., 
  Penn.; 
  by 
  Florence 
  

   Bascom. 
  XJ. 
  S. 
  Geol. 
  Surv., 
  Bull. 
  No. 
  136, 
  Washington, 
  1896. 
  

  

  * 
  16th 
  Ann. 
  Rep. 
  U. 
  S. 
  Geol. 
  Surv., 
  Part 
  IV, 
  pp. 
  620-623. 
  

  

  