Page 6 - elizondo1953

form thi,:i dominant structurul fea.ture o.f' t.he a:roao A poS!:lsibUi.t.y of

r:u:arrna.1 !'ault,;tirl/J; ox::h,·t:.s in the northw~stl:clI'n p3rt, the 1:u:"ea, bGtween

Eocene ( ?)-M1.ooe,lii::i ( ?) :rooks e.nd the .Hint Canyo-.r, tormati.o:n, ani:'.l ts .f'ully

The e,131Ji.r,1:2ntary forma.tione a.re f'olded&l &"ld the .!L"'t(:)lS follarr1

11 northwest-eouth.'3ast direction in the northern p!U1:, of f,.he ar;:,a, 1a.nd

a1N3 p1"'ohably related to a first stage d.ef'or.rc1.e:t:ion in pra.,,.r,iint, Oa:r(YOD.

·t.:i.meaB to the south, tha fold axes tre:nd north.,,,eouth 9 and seam to

related. t,o · a second stage of def orraat:lon that probably took plaee in

pi~st-late M:looeue tim0,,

'fn,9 area :ls in its late youth to early mature state of'

topoeraphic dev~lopmant. T'na r:rt.re .. ?-.m along S,1;;,11 Franci!13quito Ca.:r..yon

cute a.c:roea the at.1"uci~t'l.r.e o.t· ·the ~lone ichists iriibcriminately for

least one mile 9 r~f'leoting 1n:001r1i~ar1ce drain~ge system

estl.!l.bU.sl1ed t.mder rlif'ferent 0011.diM.one. CaVfJ~oue weiatherji.niR b lairgc,ly

cu::n1f inir~d to hard 11 illaiss~Lvel! conglome:rati0 srmdstone of

J;,~ig~ene( J...ir•1;1(;:c,~ioo(?) age, in the north central of e,roc,.