Rocks  somewhat  similar  to  the  Abrams  and  Salmon
formations  crop  out  in  the  northern  part  of  the  central
belt,  and  in  a  large  area  isolated  within  the  general  bound-
aries of  the  western  Paleozoic  and  I  riassic  belt  in  Cali-
fornia and  southern  Oregon.  They  commonly  are  referred
to  the  Abrams  and  Salmon  formations  although  they  arc
not  known  with  assurance  to  be  correlative.  The  large
isolated  area  is  chiefly  north  of  the  Klamath  River,  and
covers  the  four  common  corners  of  the  Seiad  and  Yreka
30-minute  quadrangles  in  California  (fig.  2).  and  the
Grants  Pass  and  Vledford  30-minute  quadrangles  in
southern  Oregon.  In  the  Seiad  quadrangle  the  rocks  have
been  referred  to  as  "older  metamorphic  rocks"  ( Rynear-
son  and  Smith,  1940.  p.  2X4).  in  the  Yreka  quadrangle  as
Abrams  schist  (see  Averill,  1931.  plate  in  pocket),  and
in  the  .Medford  and  Grants  Pass  quadrangles  as  "old
schists'"  (Wells  and  others,  1939  and  1940).  The  rocks
of  the  large  isolated  area  as  a  whole  have  been  referred
to  as  Salmon  and  Abrams  schist  by  Wells  and  Cater
(1950.  p.  si).  In  the  Preston  Peak  quadrangle,  isolated
pendants  of  so-called  Salmon  formation  have  been  re-
ported by  Maxson  (1933,  p.  12K).  In  the  vicinity  of
Scott  Valley,  rocks  previously  mapped  (see  Averill.  1931,
plate  in  pocket)  as  undivided  sedimentary  rocks  and
schists  of  early  Paleozoic  and  possibly  Precambrian  age
are  considered  to  be  Abrams  and  Salmon  formations  by
Seymour  .Mack    (written  communication.   1956).
