vanhise.]  THE    CORDILLERAS.  295 
An  examination  of  the  Weber  canyon  of  the  Farmington  area  showed 
that  the  rocks,  instead  of  always  having  a  western  dip  as  described, 
are  most  intricately  and  minutely  folded,  and  dip  both  cast  and  west, 
although  having  a  general  sameness  of  dip  for  considerable  areas.  In 
this  canyon  and  in  Sawmill  canyon  a  search  failed  to  find  evidence  of 
unconformity  between  two  scries  of  Archean  rocks.  The  schists 
and  gneisses  are  cut  by  pegmatitic  granite  veins  in  the  most  irregular 
and  intricate  fashion.  The  main  mass  of  the  lower  part  of  the  Sawmill 
canyon  Archean  is. a  series  of  schists.  In  going  up  the  canyon,  gran- 
ite begins  to  appear  cutting  the  schists,  and  becomes  more  and  more 
prominent  until  it  is  the  most  abundant  material.  It  is  here  exceed- 
ingly coarse,  and  the  whole  appearance  is  that  of  an  intrusive  which 
has  cut  the  schists  and  gneisses  by  numerous  apophyses.  It  is  prob- 
able that  the  small  area  referred  to  by  King  as  being  the  older  uncon- 
formable Archean  was  not  found. 
LITERATURE   OP   THE  PROMONTORY  RIDGE,  FREMONT  ISLAND   AND  ANTELOPE   ISLAND 
RANGES. 
Stansbtjry,1  in  1853,  states  that  granite,  gneiss,  mica-schist,  slate, 
and  hornblende-rock  occur  at  Antelope  and  Fremont  islands.  On  the 
west  side  of  Fremont  island  is  a  bold  escarpment  100  feet  high  of  tal- 
cose  slate,  overlain  by  granite  and  gneiss.  On  Promontory  point  mica- 
slate  and  limestone  were  seen. 
Hague,6  in  1877,  finds  the  promontory  of  Great  Salt  lake  to  consist 
of  quartzites  and  mica-bearing  schists  in  a  conformable  series,  dipping 
to  the  west  about  38°,  and  estimated  to  be  3,800  feet  thick.  In  the 
middle  of  the  series  is  a  zone  of  calcareous  sandstone,  within  which  are 
several  beds  of  limestone.  In  the  vicinity  of  Promontory  station  the 
Archean  schists  are  overlain  by  limestones.  On  Fremont  and  Ante- 
lope islands  are  outcrops  of  Archean  rocks.  That  of  Fremont  island 
consists  of  hornblendic  and  micaceous  gneisses,  dipping  to  the  west, 
while  that  of  Antelope  island  is  mostly  gneisses  with  some  quartzites 
and  mica- slates,  one  of  these  beds  becoming  calcareous  and  approach- 
ing a  limestone. 
LITERATURE   OP   THE   OQUIRRH   MOUNTAINS. 
Hayden,21  in  1873,  describes  regularly  stratified  quartzites  as  resting 
upon  a  series  of  granitoid  strata  in  the  Oquirrh  mountains  at  the  south 
end  of  Salt  lake.  The  quartzites  pass  up  into  micaceous  clays  or  shales, 
then  into  limestones.  The  lower  beds  of  quartzite  and  limestone  are 
probably  of  Silurian  age,  and  it  is  known  that  the  second  limestone  is 
of  Carboniferous  age. 
Emmons,  (S.  F.),6  in  1877,  finds  granite  porphyry  in  the  foot-hills  of  the 
Oquirrh  mountains,  and  in  the  same  range,  at  the  head  of  Bingham 
canyon,  are  diorite  dikes  which  resemble  those  of  the  main  Wasatch 
range. 
