﻿Geology 
  and 
  Mineralogy. 
  651 
  

  

  (Carnegie 
  Institution 
  of 
  Washington, 
  Publication 
  No. 
  54). 
  — 
  This 
  

   long 
  delayed 
  volume 
  completes 
  the 
  great 
  work 
  of 
  Willis 
  and 
  

   Blackwelder, 
  " 
  Research 
  in 
  China." 
  Our 
  knowledge 
  of 
  the 
  Pale- 
  

   ozoic 
  faunas, 
  and 
  especially 
  of 
  those 
  of 
  the 
  Cambrian, 
  is 
  hereby 
  

   vastly 
  extended. 
  The 
  greater 
  part 
  of 
  volume 
  three 
  is 
  taken 
  up 
  

   with 
  the 
  Cambrian 
  faunas 
  collected 
  by 
  Iddings 
  and 
  Blackwelder, 
  

   consisting 
  of 
  250 
  forms 
  in 
  63 
  genera 
  and 
  5 
  subgenera. 
  Of 
  these, 
  

   15 
  forms 
  occur 
  in 
  the 
  Lower 
  Cambrian, 
  185 
  in 
  the 
  Middle 
  Cam- 
  

   brian, 
  and 
  54 
  in 
  the 
  Upper 
  Cambrian, 
  4 
  being 
  common 
  to 
  the 
  

   Middle 
  and 
  Upper 
  Cambrian. 
  

  

  As 
  is 
  the 
  rule 
  in 
  these 
  early 
  faunas, 
  the 
  Brachiopoda 
  (40 
  

   forms), 
  Trilobita 
  (1Y9) 
  and 
  Pteropoda 
  (11) 
  predominate, 
  with 
  the 
  

   coiled 
  Gastropoda 
  (11) 
  taking 
  their 
  rise. 
  It 
  is 
  stated 
  by 
  the 
  

   author 
  that 
  " 
  among 
  the 
  brachiopods 
  none 
  of 
  the 
  genera 
  is 
  pecu- 
  

   liar 
  to 
  the 
  Chinese 
  Cambrian. 
  All 
  belong 
  to 
  genera 
  found 
  in 
  

   the 
  Middle 
  Cambrian 
  of 
  western 
  North 
  America 
  and 
  northwestern 
  

   Europe. 
  . 
  . 
  . 
  The 
  exceptional 
  genera 
  of 
  the 
  Trilobita 
  found 
  in 
  

   China 
  and 
  not 
  known 
  to 
  occur 
  elsewhere 
  are 
  Stephanocare, 
  Tein- 
  

   istion, 
  Plackwelderia, 
  Damesella, 
  and 
  Drepanura. 
  All 
  other 
  

   genera 
  are 
  represented 
  in 
  western 
  North 
  America 
  and 
  western 
  

   Europe, 
  and 
  there 
  is 
  a 
  striking 
  resemblance 
  even 
  to 
  specific 
  char- 
  

   acters 
  in 
  many 
  of 
  the 
  forms. 
  The 
  most 
  noticeable 
  omissions 
  of 
  

   American 
  and 
  European 
  genera 
  from 
  the 
  Chinese 
  fauna 
  are 
  Para- 
  

   doxides 
  of 
  the 
  Atlantic 
  Basin 
  fauna 
  and 
  Olenoides, 
  Dikelocepha- 
  

   lus, 
  and 
  JVeolenus 
  of 
  the 
  North 
  American 
  fauna. 
  The 
  closely 
  

   related 
  genus 
  Dorypyge 
  (to 
  Olenoides) 
  is 
  found 
  abundantly 
  in 
  

   China, 
  western 
  United 
  States, 
  and 
  on 
  the 
  island 
  of 
  Bornholm 
  in 
  

   northwestern 
  Europe. 
  The 
  genera 
  Ptychoparia, 
  Conokephalina, 
  

   Acrocep 
  halites, 
  Inouyia, 
  Agraulos, 
  Lisania, 
  Solenopleura, 
  Ano- 
  

   mocare, 
  A?iomocarella, 
  and 
  Coosia 
  are 
  well 
  represented 
  in 
  China, 
  

   western 
  North 
  America, 
  southwestern 
  United 
  States, 
  and 
  north- 
  

   western 
  Europe. 
  Bathyuriscus 
  and 
  Asaphiscus 
  are 
  essentially 
  

   Pacific 
  Basin 
  types" 
  (47, 
  48). 
  

  

  Walcott 
  summarizes 
  his 
  results 
  as 
  follows 
  : 
  

  

  "The 
  chief 
  results 
  obtained 
  from 
  the 
  study 
  of 
  the 
  Chinese 
  col- 
  

   lections 
  are 
  the 
  discovery 
  of 
  portions 
  of 
  the 
  upper 
  part 
  of 
  the 
  

   Lower 
  Cambrian 
  fauna 
  and 
  a 
  great 
  development 
  of 
  a 
  Middle 
  

   Cambrian 
  fauna 
  of 
  the 
  same 
  general 
  character 
  as 
  that 
  of 
  the 
  Cor- 
  

   dilleran 
  Province 
  of 
  western 
  North 
  America 
  ; 
  also 
  an 
  Upper 
  

   Cambrian 
  fauna 
  comparable 
  with 
  that 
  of 
  the 
  Cordilleran 
  Province 
  

   and 
  the 
  Upper 
  Mississippi 
  Province 
  of 
  the 
  United 
  States. 
  . 
  . 
  . 
  

  

  u 
  Another 
  important 
  discovery 
  was 
  that 
  of 
  the 
  occurrence 
  in 
  

   the 
  Middle 
  Cambrian 
  of 
  China 
  of 
  a 
  fauna 
  comparable 
  with 
  that 
  

   of 
  the 
  Middle 
  Cambrian 
  of 
  Mount 
  Stephen, 
  British 
  Columbia, 
  

   and 
  the 
  southern 
  extension 
  of 
  the 
  same 
  fauna 
  in 
  the 
  Middle 
  Cam- 
  

   brian 
  of 
  Idaho, 
  Utah, 
  and 
  Nevada 
  in 
  the 
  United 
  States. 
  

  

  " 
  The 
  determination 
  of 
  the 
  age 
  of 
  the 
  Man-t'o 
  shales 
  [closing 
  

   epoch 
  of 
  Lower 
  Cambrian 
  time] 
  affords 
  the 
  data 
  by 
  which 
  to 
  fix 
  

   the 
  period 
  of 
  Cambrian 
  time 
  in 
  which 
  the 
  Cambrian 
  sea 
  trans- 
  

   gressed 
  over 
  eastern 
  and 
  southeastern 
  Asia, 
  and 
  shows 
  that 
  it 
  

  

  