﻿Geology 
  and 
  Mineralogy. 
  79 
  

  

  scribed 
  by 
  Sir 
  Wm. 
  Dawson 
  ; 
  the 
  other 
  is 
  described 
  in 
  the 
  pres- 
  

   ent 
  paper 
  under 
  the 
  name 
  of 
  Chuaria 
  circularis. 
  Some 
  others, 
  

   obscure 
  forms, 
  possibly 
  Hyolithes, 
  are 
  associated 
  with 
  them. 
  

  

  The 
  fossils 
  described 
  from 
  the 
  Belt 
  terrane 
  of 
  Montana 
  consti- 
  

   tute 
  the 
  more 
  important 
  contributions 
  of 
  this 
  paper. 
  They 
  occur 
  

   in 
  the 
  " 
  Greyson 
  shales, 
  in 
  a 
  belt 
  of 
  calcareous 
  shales 
  about 
  100 
  

   feet 
  above 
  the 
  Newland 
  limestone, 
  at 
  a 
  horizon 
  approximately 
  

   ^,700 
  feet 
  beneath 
  the 
  summit 
  of 
  the 
  Belt 
  terrane 
  at 
  its 
  maximum 
  

   development. 
  Indications 
  of 
  fossils 
  were 
  first 
  discovered 
  near 
  

   the 
  mouth 
  of 
  Deep 
  Creek 
  canyon, 
  a 
  short 
  distance 
  above 
  Glen- 
  

   wood 
  postoflSce. 
  Subsequently 
  they 
  were 
  found 
  in 
  Sawmill 
  can- 
  

   yon, 
  about 
  4 
  miles 
  above 
  Keihart." 
  

  

  " 
  The 
  fauna 
  includes 
  4 
  species 
  of 
  annelid 
  trails 
  and 
  a 
  variety 
  

   that 
  appears 
  to 
  have 
  been 
  made 
  by 
  a 
  minute 
  mollusk 
  or 
  crusta- 
  

   cean. 
  There 
  also 
  occur 
  in 
  the 
  same 
  shales 
  thousands 
  of 
  frag- 
  

   ments 
  of 
  one 
  or 
  more 
  genera 
  of 
  crustaceans. 
  All 
  the 
  specimens 
  

   are 
  very 
  much 
  compressed 
  and 
  flattened, 
  and 
  often 
  large 
  frag- 
  

   ments 
  of 
  the 
  test 
  have 
  been 
  broken 
  by 
  a 
  movement 
  in 
  the 
  shale 
  

   subsequent 
  to 
  their 
  embedment 
  in 
  the 
  mud." 
  

  

  " 
  The 
  most 
  interesting 
  feature 
  of 
  the 
  fauna 
  is 
  the 
  occurrence 
  of 
  

   undoubted 
  organic 
  remains 
  and 
  the 
  j^resence 
  of 
  a 
  crustacean 
  of 
  a 
  

   much 
  higher 
  type 
  than 
  most 
  paleontologists 
  would 
  have 
  pre- 
  

   dicted 
  for 
  this 
  horizon." 
  

  

  Six 
  new 
  species 
  are 
  described 
  from 
  these 
  shales, 
  distributed 
  in 
  

   three 
  different 
  genera, 
  one 
  of 
  which 
  is 
  a 
  new 
  genus, 
  referred 
  to 
  

   the 
  Merostomata, 
  w. 
  

  

  4. 
  A 
  PalcBozoic 
  Terrane 
  heneath 
  the 
  Cambrian 
  ; 
  by 
  Geo. 
  F. 
  

   Matthew. 
  Annals 
  N. 
  Y. 
  Acad. 
  Sci., 
  vol. 
  xii. 
  No. 
  2, 
  pp. 
  41-56, 
  

   1899. 
  — 
  This 
  paper 
  describes 
  a 
  series 
  of 
  strata 
  beneath 
  the 
  Cam- 
  

   brian 
  in 
  New 
  Brunswick, 
  Canada, 
  and 
  Newfoundland, 
  which 
  

   uncomformably 
  underlie 
  that 
  system. 
  The 
  terrane 
  in 
  Canada 
  is 
  in 
  

   the 
  southern 
  part 
  of 
  the 
  province 
  of 
  New 
  Brunswick, 
  and 
  is 
  ex- 
  

   posed 
  in 
  certain 
  valleys 
  by 
  the 
  erosion 
  of 
  the 
  Cambrian. 
  It 
  con- 
  

   sists 
  of 
  red 
  and 
  green 
  slates 
  and 
  sandstones, 
  with 
  some 
  conglom- 
  

   erate 
  at 
  the 
  base, 
  and 
  intercalated. 
  In 
  Newfoundland 
  at 
  Smith 
  

   Sound, 
  on 
  Trinity 
  Bay, 
  and 
  elsewhere, 
  a 
  similar 
  series 
  of 
  strata 
  are 
  

   found 
  ; 
  but 
  here 
  the 
  strata 
  are 
  almost 
  entirely 
  red 
  slates, 
  though 
  

   limestone 
  beds 
  are 
  intercalated. 
  

  

  In 
  the 
  limestones 
  there 
  is 
  found 
  a 
  fauna 
  which 
  has 
  notable 
  

   points 
  of 
  difference 
  from 
  the 
  Cambrian. 
  No 
  trilobites 
  have 
  been 
  

   found 
  in 
  it, 
  but 
  the 
  Ilyolithidoe 
  are 
  especially 
  numerous, 
  and 
  for 
  

   size 
  exceed 
  all 
  other 
  forms 
  of 
  the 
  fauna. 
  Conical 
  shells 
  resem- 
  

   bling 
  Pala?acm?ea 
  and 
  Scenella 
  are 
  common, 
  but 
  other 
  Gaster- 
  

   opods 
  and 
  the 
  Brachiopods 
  are 
  quite 
  small. 
  A 
  small 
  Lamelli- 
  

   branch 
  was 
  found, 
  and 
  a 
  minute 
  crustacean 
  (Aptychopsis). 
  Bur- 
  

   rows 
  and 
  trails 
  of 
  worms 
  occur. 
  Attention 
  is 
  called 
  to 
  the 
  

   advanced 
  development 
  of 
  the 
  HyolithidjB 
  which 
  are 
  present 
  in 
  

   this 
  fauna. 
  It 
  is 
  suggested 
  that 
  some 
  of 
  the 
  red 
  slates 
  near 
  

   Boston, 
  Mass., 
  may 
  be 
  of 
  this 
  age. 
  

  

  