540  PRE-CAMBRIAN   GEOLOGY   OF    NORTH   AMERICA. 
of  Cape  Esquimaux,  and  inland  for  70  miles  "up  the  Ferguson  River. 
Other  areas  are  found  between  Schultz  and  Baker  lakes,  near  Lake 
Angikuni,  near  Kasba  and  Ennaidai  lakes,  on  the  north  shore  of 
Doobaunt  Lake,  and  on  the  east  shore  of  Wharton  Lake. 
The  Huronian  rocks  are  overlain  unconformably  by  the  Athabaska 
sandstone.  As  this  sandstone  is  older  than  the  flat-lying  Cambro- 
Silurian  limestone  and  is  unconformably  above  the  Huronian,  it  is 
assigned  to  the  Cambrian,  although  no  fossils  were  found  in  the  for- 
mation. Lithologically  the  whole  terrane  presents  a  remarkable 
resemblance  to  the  red  sandstones  and  Cambrian  quartz  porphyries 
of  the  Keweenawan  rocks  of  Lake  Superior,  and  the  two  terranes  are 
regarded  as  holding  essentially  similar  positions  in  the  geological 
time  scale. 
Parks,53  in  1900,  describes  the  geology  of  the  Moose  River  basin  in 
Canada,  including  Moose  and  Abitibi  rivers,  tributary  to  James  Bay. 
This  is  an  immense  triangular  area,  of  which  the  apex  is  at  James 
Bay  and  the  base  stretches  from  above  Lake  Abitibi  to  a  point  west 
of  Kabinakagami.  The  southern  and  major  portion  of  this  triangu- 
lar area  consists  of  Laurentian  gneisses  and  granites  crossed  by  bands 
of  Huronian  rocks.  The  term  "  Huronian "  is  applied  to  all  the 
rocks  above  the  Laurentian  and  beneath  the  lowest  fossiliferous 
strata,  in  this  sense  including  rocks  of  various  ages  and  different 
petrographic  nature,  such  as  Logan's  original  Huronian,  Lawson's 
Keewatin  and  Coutchiching  series,  the  Animikie  and  Nepigon  forma- 
tions, the  graywacke  and  associated  rocks  of  the  Sudbury  region,  and 
the  various  schists,  altered  erupt ives.  and  crushed  granites  character- 
istic of  wide  areas  in  northern  Ontario.  In  the  region  under  discus- 
sion the  Huronian  is  represented  by  a  great  variety  of  schists,  pre- 
sumably of  clastic  origin,  and  by  others  of  altered  eruptive  nature, 
closely  associated  with  both  acidic  and  basic  eruptives  in  various 
stages  of  decomposition.  The  discussion  of  the  distribution  of  the 
Huronian  rocks  is  summarized  from  reports  of  the  Ontario  Bureau  of 
Mines,  the  Canadian  Geological  Survey,  and  the  Canadian  Govern- 
ment. 
Low,54  in  1901,  describes  and  maps  the  geology  of  the  south  coast 
of  Hudson  Strait  and  the  west  and  south  shores  of  Ungava  Bay. 
Granite  and  gneiss  of  various  ages  occupy  three-fourths  of  the  coastal 
area.  Associated  with  them  are  gabbros,  diabases,  and  other  green- 
stones, cherts,  quartzites,  shales,  and  slates.  All  are  provisionally 
referred  to  the  Archean.a  Flat-bedded  Cambrian  rocks,  so  called, 
rest  with  apparent  unconformity  upon  the  crystalline  complex. 
Tyrrell  and  Dowling,55  in  1901,  describe  and  map  the  east  shore  of 
Lake  Winnipeg.  The  rocks  are  all  Archean  and  the  great  preponder- 
ance of  gneisses  and  granites  of  the  Laurentian  is  the  chief  feature. 
a  Pre-Cambrian. 
