﻿Paheozoic 
  B 
  halved 
  Entomostraca. 
  375 
  

  

  By 
  J. 
  W. 
  Dawson, 
  C.M.G. 
  &c. 
  Part 
  ii. 
  8vo. 
  Montreal, 
  

   1882, 
  p. 
  96. 
  "Erian 
  and 
  Upper-Silurian 
  Plants 
  from 
  the 
  

   Restigouehe 
  River 
  and 
  the 
  Baie 
  des 
  Chaleurs 
  

  

  " 
  At 
  Cape 
  Bon-Ami, 
  near 
  Dalhousie 
  [New 
  Brunswick], 
  a 
  

   fine 
  section 
  is 
  exposed 
  of 
  bedded 
  doleritic 
  traps, 
  alternating 
  

   with 
  bands 
  of 
  limestone 
  and 
  shale 
  abounding 
  in 
  marine 
  

   fossils. 
  These, 
  as 
  determined 
  by 
  the 
  late 
  Mr. 
  Billings, 
  are 
  

   characteristic 
  of 
  the 
  Upper- 
  Silurian 
  period 
  and 
  of 
  the 
  Lower- 
  

   Helderberg 
  group 
  *. 
  Some 
  of 
  the 
  upper 
  beds 
  of 
  this 
  series 
  

   include 
  fragments 
  of 
  fossil 
  plants, 
  showing 
  the 
  structure 
  of 
  

   Prototaxites 
  and 
  detached 
  specimens 
  of 
  Pachytheca 
  (/Etheo- 
  

   testa 
  f) 
  . 
  At 
  Cape 
  Bon-Ami 
  these 
  beds 
  are 
  succeeded, 
  appa- 
  

   rently 
  conformably, 
  by 
  a 
  great 
  thickness 
  of 
  reddish 
  porphyry 
  

   and 
  porphyritic 
  breccia, 
  forming 
  the 
  Lighthouse 
  Point 
  at 
  

   Dalhousie. 
  

  

  " 
  Further 
  up 
  the 
  Restigouche 
  River, 
  however, 
  in 
  the 
  

   vicinity 
  of 
  Campbellton, 
  where 
  similar 
  rocks 
  occur, 
  they 
  are 
  

   overlain 
  by 
  calcareous 
  and 
  magnesian 
  breccia 
  or 
  agglomerate, 
  

   hard 
  shales, 
  conglomerates, 
  and 
  sandstones 
  of 
  Lower 
  Devo- 
  

   nian 
  age. 
  The 
  agglomerate 
  [breccia] 
  and 
  lower 
  shales 
  con- 
  

   tain 
  abundant 
  remains 
  of 
  fishes 
  of 
  the 
  genera 
  Cephalaspis 
  

   [campbelltonensis, 
  Whiteaves], 
  Coccosteus 
  [acadicus 
  } 
  Whit- 
  

   eaves], 
  Ctenacanthus, 
  and 
  Bomacanthus, 
  and 
  also 
  fragments 
  

   of 
  Pterygotus. 
  The 
  shales 
  and 
  sandstones 
  abound 
  in 
  remains 
  

   of 
  Psiloj)hyton, 
  with 
  which 
  are 
  Prototaxites, 
  Arthrostigma, 
  

   and 
  Leptophloeum, 
  of 
  the 
  same 
  species 
  as 
  those 
  found 
  in 
  the 
  

   Lower 
  Devonian 
  of 
  Gaspe 
  Bay." 
  

  

  I. 
  Lower- 
  Devonian 
  Specimens 
  from 
  Campbellton, 
  

   New 
  Brunswick. 
  

  

  These 
  are 
  magnified 
  15 
  diam. 
  in 
  Plate 
  XVI. 
  and 
  therefore 
  

   look 
  larger 
  than 
  those 
  from 
  Cap 
  Bon- 
  Ami 
  in 
  Plate 
  XVI 
  [., 
  

   which 
  were 
  magnified 
  only 
  10 
  diam., 
  so 
  as 
  to 
  allow 
  the 
  

   two 
  large 
  forms, 
  figs. 
  10 
  and 
  11, 
  to 
  be 
  included 
  in 
  that 
  Plate. 
  

   For 
  the 
  material 
  of 
  the 
  specimens 
  (nos. 
  1-23) 
  see 
  above, 
  

   p. 
  374. 
  

  

  1. 
  Primitia 
  mundula, 
  Jones, 
  varieties. 
  

   (PL 
  XVI. 
  figs. 
  1, 
  2, 
  4-9, 
  and 
  woodcut, 
  fig. 
  2.) 
  

  

  The 
  Primitt'ce 
  from 
  Campbellton 
  are 
  certainly 
  closely 
  

   allied 
  together, 
  and, 
  excepting 
  fig. 
  3, 
  do 
  not 
  differ 
  much 
  from 
  

   Primitia 
  mundula, 
  Jones 
  (Ann. 
  & 
  Mag. 
  Nat. 
  Hist, 
  ser, 
  2, 
  

  

  * 
  " 
  ' 
  Acadian 
  Geology,' 
  p. 
  579." 
  

   t 
  " 
  Fruit 
  of 
  Prototaxites 
  ? 
  " 
  

  

  26* 
  

  

  