﻿Geology 
  and 
  Mineralogy. 
  73 
  

  

  gicm. 
  The 
  east-and-west 
  ridge 
  called 
  Mt. 
  Carmel, 
  situated 
  about 
  

   half 
  way 
  between 
  New 
  Haven 
  and 
  the 
  Meriden 
  trap 
  ridges 
  is 
  a 
  

   "great 
  mass 
  of 
  dikes," 
  which 
  "may 
  be 
  regarded 
  as 
  the 
  locus 
  of 
  

   the 
  volcanic 
  pipes 
  up 
  through 
  which 
  rose 
  the 
  lavas 
  now 
  seen 
  in 
  

   the 
  extrusive 
  and 
  intrusive 
  sheets." 
  The 
  existence 
  of 
  these 
  vol- 
  

   canoes 
  is 
  spoken 
  of 
  as 
  without 
  direct 
  evidence, 
  but 
  probable. 
  In 
  

   the 
  two 
  figures 
  of 
  the 
  paper 
  these 
  volcanoes 
  are 
  represented 
  as 
  

   buried 
  in 
  the 
  sandstone 
  formation 
  and 
  are 
  entitled 
  " 
  the 
  Group 
  

   of 
  buried 
  volcanoes," 
  "The 
  lost 
  volcanoes." 
  The 
  tilting 
  of 
  the 
  

   sandstone 
  with 
  the 
  intercalated 
  sheet 
  of 
  trap, 
  giving 
  the 
  forma- 
  

   tion 
  its 
  eastward 
  dip 
  throughout 
  the 
  region, 
  probably 
  followed 
  

   the 
  time 
  of 
  deposition 
  and 
  eruption. 
  Even 
  the 
  intrusive 
  dike, 
  

   West 
  Rock, 
  is 
  probably 
  "of 
  earlier 
  date 
  than 
  the 
  tilting 
  and 
  

   faulting 
  of 
  the 
  formation, 
  and 
  hence 
  of 
  roughly 
  synchronous 
  date 
  

   with 
  the 
  overflows." 
  The 
  faulting 
  of 
  the 
  sandstone 
  accompany- 
  

   ing 
  the 
  uplifts 
  was 
  probably 
  guided 
  in 
  direction 
  by 
  the 
  planes 
  of 
  

   foliation 
  in 
  the 
  underlying 
  schists. 
  ■ 
  

  

  The 
  two 
  belts 
  of 
  black 
  shale 
  contain 
  fossil 
  fishes 
  and 
  plants. 
  

   One 
  of 
  them 
  is 
  that 
  of 
  the 
  well-known 
  Durham 
  locality 
  and 
  others 
  

   of 
  the 
  same 
  belt. 
  The 
  second 
  occurs 
  in 
  a 
  small 
  brook 
  north 
  of 
  the 
  

   village 
  of 
  Westfield, 
  Conn., 
  and 
  has 
  been 
  opened 
  also 
  at 
  four 
  

   other 
  places 
  along 
  a 
  line 
  of 
  about 
  fifty 
  miles. 
  The 
  latter, 
  Mr. 
  

   Loper 
  states, 
  has 
  afforded 
  one 
  species 
  of 
  fish, 
  Ischypterus 
  gigas, 
  

   not 
  found 
  in 
  the 
  Durham 
  line, 
  and 
  two 
  species 
  of 
  plants 
  also 
  

   absent 
  from 
  it, 
  Equisetum 
  Rogersi 
  Sch., 
  and 
  Ctenophyllum 
  

   Braunianum 
  Sch. 
  

  

  3. 
  Illustrations 
  of 
  the 
  Fauna 
  of 
  the 
  /St. 
  John 
  Group, 
  No. 
  V. 
  ; 
  

   by 
  G. 
  F. 
  Matthew. 
  — 
  Mr. 
  G. 
  F. 
  Matthew's 
  paper 
  under 
  the 
  

   above 
  title, 
  though 
  read 
  before 
  the 
  Royal 
  Society 
  of 
  Canada 
  in 
  

   May, 
  1890, 
  has 
  only 
  recently 
  been 
  distributed. 
  The 
  author 
  has 
  

   made 
  a 
  study 
  of 
  the 
  fauna 
  of 
  the 
  lower 
  rocks 
  of 
  New 
  Brunswick, 
  

   especially 
  near 
  the 
  city 
  of 
  St. 
  John, 
  and 
  has 
  given 
  the 
  results 
  of 
  

   his 
  labors 
  in 
  numerous 
  papers 
  of 
  interest. 
  In 
  the 
  present 
  one 
  after 
  

   discussing 
  the 
  structure 
  of 
  the 
  St. 
  John 
  Basin, 
  and 
  various 
  sec- 
  

   tions 
  of 
  the 
  strata, 
  he 
  describes 
  several 
  new 
  species 
  of 
  fossils 
  and 
  

   presents 
  remarks 
  upon 
  some 
  old 
  ones, 
  especially 
  upon 
  trilobites. 
  

   This 
  section 
  is 
  followed 
  by 
  a 
  third 
  treating 
  mainly 
  of 
  tracks 
  and 
  

   markings, 
  and 
  upon 
  this 
  we 
  offer 
  some 
  remarks 
  and 
  criticisms. 
  

  

  He 
  gives, 
  in 
  the 
  first 
  place, 
  a 
  short 
  sketch 
  of 
  Nathorst's 
  obser- 
  

   vations 
  upon 
  Medusas, 
  quoting 
  the 
  descriptions 
  of 
  Medu 
  sites 
  

   princeps 
  Torell 
  (sp.) 
  (= 
  M. 
  favosa 
  of 
  Nathorst), 
  M. 
  radiata 
  

   Linrs., 
  (sp.) 
  and 
  M. 
  costata 
  Torell 
  (sp.) 
  (-M. 
  Lindstromi 
  of 
  

   Nathorst). 
  All 
  these 
  forms 
  were 
  described 
  from 
  beds 
  of 
  Cam- 
  

   brian 
  age 
  in 
  Sweden, 
  and 
  Mr. 
  Matthew 
  says 
  that 
  in 
  the 
  St. 
  John 
  

   group 
  indications 
  are 
  found 
  of 
  some 
  of 
  these 
  " 
  medusa-like 
  forms 
  

   as 
  Nathorst 
  considers 
  them." 
  He 
  then 
  proceeds 
  to 
  describe 
  a 
  

   new 
  genus 
  Medusichnites, 
  founded 
  for 
  the 
  reception 
  of 
  certain 
  

   trails 
  or 
  tracks 
  " 
  which 
  appear 
  to 
  have 
  been 
  produced 
  by 
  such 
  

   creatures." 
  Not 
  that 
  there 
  is 
  any 
  indication 
  they 
  were 
  positively 
  

   made 
  by 
  Medusa?, 
  "but 
  rather 
  that 
  they 
  are 
  probably 
  due 
  to 
  

  

  