﻿Geology. 
  307 
  

  

  6. 
  Kritische 
  Studien 
  ueber 
  die 
  Terebratula-Arten 
  der 
  

   schivedischen 
  Kreide 
  formation; 
  by 
  Assar 
  Hadding. 
  Palaeon- 
  

   tographica, 
  vol. 
  63, 
  25 
  pp., 
  9 
  pis., 
  5 
  text 
  figs., 
  1919. 
  — 
  This 
  is 
  a 
  

   revision 
  of 
  the 
  Swedish 
  species 
  of 
  Danian 
  and 
  Senonian 
  Terebra- 
  

   tulas, 
  based 
  on 
  the 
  external 
  characters, 
  internal 
  ones 
  not 
  being 
  

   accessible. 
  There 
  are 
  nineteen 
  forms, 
  and 
  of 
  these 
  four 
  are 
  new 
  

   varieties. 
  It 
  is 
  to 
  be 
  regretted 
  that 
  nothing 
  is 
  attempted 
  in 
  the 
  

   way 
  of 
  a 
  generic 
  revision, 
  since 
  it 
  appears 
  that 
  more 
  than 
  one 
  

   genus 
  is 
  present. 
  c. 
  s. 
  

  

  7. 
  A 
  Catalogue 
  of 
  the 
  Mesozoic 
  and 
  Cenozoic 
  Plants 
  of 
  North 
  

   America; 
  by 
  F. 
  H. 
  Knowlton. 
  U. 
  S. 
  Geol. 
  Survey, 
  Bull. 
  696, 
  

   815 
  pp., 
  1919. 
  — 
  In 
  this 
  catalogue 
  Knowlton 
  gives 
  the 
  biblio- 
  

   graphic 
  references 
  to 
  about 
  735 
  genera 
  and 
  about 
  4150 
  named 
  

   species 
  and 
  varieties 
  of 
  plants 
  found 
  in 
  the 
  Mesozoic 
  and 
  Ceno- 
  

   zoic 
  of 
  the 
  United 
  States 
  and 
  Canada. 
  The 
  starting 
  point 
  for 
  

   the 
  recognition 
  of 
  names 
  is 
  the 
  Linnasan 
  "Species 
  Plantarum" 
  

   of 
  1753. 
  In 
  1878 
  Lesquereux 
  listed 
  706 
  forms. 
  In 
  the 
  Triassic, 
  

   Knowlton 
  now 
  lists 
  about 
  130 
  named 
  forms, 
  in 
  the 
  Jurassic 
  

   about 
  125, 
  and 
  the 
  remainder, 
  about 
  3895, 
  appear 
  to 
  be 
  almost 
  

   equally 
  divided 
  between 
  the 
  Cretaceous 
  (including 
  the 
  Coman- 
  

   chean) 
  and 
  the 
  Cenozoic. 
  The 
  genera, 
  species, 
  and 
  varieties, 
  

   and 
  their 
  synonyms 
  are 
  arranged 
  in 
  alphabetic 
  order, 
  being 
  pre- 
  

   ceded 
  by 
  the 
  bibliography 
  (about 
  474 
  titles) 
  arranged 
  according 
  

   to 
  authors 
  (about 
  70). 
  Following 
  the 
  catalogue 
  there 
  are 
  given 
  

   (1) 
  a 
  biologic 
  classification 
  of 
  genera, 
  (2) 
  an 
  index 
  of 
  genera 
  

   and 
  families, 
  and 
  (3) 
  floral 
  lists 
  arranged 
  geologically 
  and 
  geo- 
  

   graphically 
  (pages 
  697-815). 
  There 
  is 
  also 
  a 
  large 
  geologic 
  

   table 
  giving 
  the 
  approximate 
  stratigraphic 
  position 
  of 
  North 
  

   American 
  Mesozoic 
  and 
  Cenozoic 
  plant-bearing 
  formations 
  as 
  

   interpreted 
  by 
  the 
  author. 
  

  

  We 
  congratulate 
  Doctor 
  Knowlton 
  upon 
  the 
  completion 
  of 
  this 
  

   indispensable 
  work 
  — 
  a 
  great 
  labor 
  of 
  love 
  — 
  for 
  which 
  he 
  has 
  the 
  

   silent 
  thanks 
  not 
  only 
  of 
  all 
  paleobotanists 
  and 
  botanists, 
  but 
  of 
  

   stratigraphers 
  as 
  well. 
  c. 
  s. 
  

  

  8. 
  Stratigraphy 
  and 
  Correlation 
  of 
  the 
  Devonian 
  of 
  Western 
  

   Tennessee, 
  Tennessee 
  Geol. 
  Survey, 
  Bull. 
  21, 
  127 
  pp., 
  4 
  pis., 
  11 
  

   text 
  figs., 
  1919. 
  New 
  Species 
  of 
  Devonian 
  Fossils 
  from 
  Western 
  

   Tennessee, 
  Trans. 
  Connecticut 
  Acad. 
  Arts 
  and 
  Sci., 
  23, 
  pp. 
  109- 
  

   158, 
  pis. 
  1-5, 
  1920. 
  By 
  Carl 
  O. 
  Dunbar. 
  — 
  The 
  Tennessee 
  

   bulletin 
  describes 
  in 
  great 
  detail 
  the 
  history, 
  structure, 
  and 
  

   stratigraphy 
  of 
  the 
  Devonian 
  — 
  largely 
  the 
  Lower 
  Devonian 
  — 
  of 
  

   the 
  Western 
  Valley 
  of 
  the 
  Tennessee 
  River, 
  aggregating 
  nearly 
  

   500 
  feet 
  in 
  thickness, 
  although 
  at 
  no 
  place 
  do 
  the 
  strata 
  exceed 
  

   about 
  150 
  feet. 
  A 
  striking 
  discovery 
  is 
  the 
  presence 
  here 
  of 
  

   upper 
  Oriskany 
  of 
  the 
  New 
  York 
  type, 
  and 
  the 
  transference 
  of 
  

   the 
  Camden 
  formation 
  from 
  the 
  Lower 
  to 
  the 
  Middle 
  Devonian. 
  

   It 
  is 
  a 
  very 
  careful 
  and 
  detailed 
  stratigraphic 
  report, 
  and 
  a 
  fit 
  

   associate 
  for 
  the 
  Lower 
  Devonian 
  work 
  of 
  the 
  states 
  of 
  New 
  York 
  

   and 
  Maryland. 
  The 
  author 
  and 
  the 
  State 
  Geological 
  Survey 
  of 
  

   Tennessee 
  are 
  to 
  be 
  congratulated 
  upon 
  the 
  production 
  of 
  this 
  

  

  Am. 
  Jour. 
  Sci.— 
  Fourth 
  Series, 
  Vol. 
  XLIX, 
  No. 
  292.— 
  April, 
  1920. 
  

   22 
  

  

  