VANHKB.J  LAKE    HURON   TO    LAKE    TEMISCAMANG.  43 
Winchell  (Alex.)53,  in  1891,  maintains  that  the  Original  Huronian 
is  divisible  into  two  unconformable  series,  the  break  occurring  between 
the  upper  and  lower  slate-conglomerates,  and  the  limestone  belonging 
With  the  upper  series.  The  descriptions  of  this  region  by  Murray  indi- 
cate that  near  lake  Wahnapitae  there  is  a  stratigraphic  unconformity 
between  the  upper  and  lower  divisions  of  the  Original  Huronian,  as 
here  the  slate-conglomerates  are  in  a  nearly  vertical  attitude,  while  the 
newer  members  seldom  have  an  inclination  greater  than  45°.  In  every 
instance  in  which  the  lower  slate-conglomerate  has  been  traced  by  Logan 
or  Murray  to  the  proximity  of  the  gneiss  these  formations  seem  to  be 
conformable  in  position,  though  the  actual  juxtaposition  was  concealed. 
At  Murray  hill  the  slate-conglomerate  has  a  dip  to  the  southward  of 
78°,  while  2  miles  south  of  this  the  slate-conglomerate  has  a  dip  of  40° 
toward  S.  30°  W.  The  first  is  regarded  as  the  lower  slate-conglomerate 
and  the  second  as  the  upper  slate-conglomerate.  At  the  junction  of  the 
Sudbury  branch  of  the  Canadian  Pacific  railway  with  Vermilion  river 
-  an  arenaceous  slaty  rock,  having  a  dip  of  45°,  rests  on  a  different  schist 
having  a  different  dip.  At  this  locality,  according  to  Lawson,  the 
unconformity  is  similar  to  that  at  Penokee  gap,  Wisconsin.  The  lower 
rock  is  a  fine  micaceous  gneiss  or  mica-schist,  and  the  upper  rock  is 
interbedded  quartzite  and  gray  argillite.  At  Echo  lake  is  a  series,  in 
descending  order,  of  sla^te-conglomerate  and  quartzite,  with  a  dip  of 
about  20c ;  after  this  is  an  interval  of  a  third  of  a  mile,  and  then  ap- 
pears a  quartzose  slate-conglomerate  comparable  with  the  Ogishki  con- 
glomerate $  this  is  followed  by  quartzite,  and  this  by  alternations  of 
quartzite,  quartz-schist,  and  various  slates,  schists,  and  argillites,  the 
series  having  a  dip  of  75°  to  80°  southwesterly,  and  being  as  a  whole 
more  crystalline  than  the  upper  system.  It  is  concluded  that  the  name 
Huronian  must  be  restricted  to  the  upper  or  lower  system ;  and  if  re- 
stricted to  the  upper  system  it  remains  attached  to  the  best  known  and 
'  most  characteristic  portion  of  the  old  complex  Huronian.  For  the  older 
system,  not  distinctly  named  until  1886  as  Keewatin  by  Lawson,  the  term 
Kewatian  is  proposed. 
Bell,54  in  1891,  describes  the  geology  of  the  district  of  Sudbury.  The 
main  outlines  of  the  great  Huronian  area  of  this  region  are  given. 
Within  this  region  are  many  inliers  of  gneiss  and  red  quartz-syenite, 
which  correspond  with  Laurentian  types  of  rock,  and  it  is  uncertain 
whether  they  are  protrusions  of  the  older  rocks  from  beneath  or  whether 
some  of  them  may  not  be  portions  of  the  Huronian  itself  which  have 
undergone  further  metamorphism.  In  the  Sudbury  district  many  of 
the  areas  consist  of  separate  masses,  like  large  and  small  bowlders,  the 
interspaces  being  filled  by  a  breccia  with  a  dioritic  paste,  and  suggest- 
ing that  these  rocks  maybe  underlain  at  no  great  depth  by  diorite 
which  was  in  a  soft  condition  after  the  gneiss  and  syenite  had  been  con- 
solidated. At  some  places  within  the  syenite  area,  as,  for  example, 
about  two  miles  west  of  Gartier,  a  massive  fine  grained  rock  like  some 
