Page 5 - elizondo1953

About ;ooo teet of Terti8ry sediment~ e)rposed :b1

vicinity of the old st. Francis Dar1i Reservo:i.rfll San Franeis...~uito

C,imyon, toe Angeles County, Cal:ifon.1ia., art1.H1 the~ri
oco11t' is 1,,1,~ted i.n the e~iste:rnmost ·t.he Ventura Bai:1:b.11!

At lea.st ;oo feet of \.Tell bedded :rred siltertoncrci,

2700 feet ot piedmont depo@it~

o.1;m l;x,; assigned to theae deposits, but to tbe m:»i"'th they are un""'

conf'o:mably undt11t>lain mar1 .. nitll ,1&t.11"~rt.a of' FncGr:-.e ags!"l,. in"ia• th:hik

bedded to tno.6aive arkOSIOSo To the vest, aoutb and southwest

1,iiedinortt depoaite are unconforniabl_y overlain by non~mrine

I.k':l.ssive sa11dstones of the Upper Miocene Mlnt Oe.nyon f'o~1.tlon., Thr:i
evidence p:revails that the sediments in the aree stud5.ec1

ff.it"ess1vely younger to the south and to the westl:l !:u1 happens ev,~,ry-whe:re

el,se in the ei:i.stt,rnmoat part of the Ventura Baeino Foasiliferoua

of. the uppermost P1iocene Modelo formation unconfo1"ll'lably overlie Mlnt,

CtUJYon bads· t.o t.he south ~nd to the

Pre....Crotaceous rocks composed of gray, qu£-irtz-rnuscov:l:te t
c:rop out in the :northeaeto:n:1most part or the a:i.~()a, Metaquartzitas and

quGflt.!i ve:bu; are :m1nor part,ei of "th5.s torr,arie.. Thi~ group of :t"ocke ie

kna1-m as Pelona Soh:ll:'!tao

m- and poi;t-Mint Canyon diP""'slip reverse faulting aoe'ifil:;i