Fig. 17.12. Evolution of structure along cross section through south 

 central part of Adelaida quadrangle, Calif., showing relations between 

 various units of Cretaceous and relations to older and younger rocks. 



1. Structure as it exists at present. 



2. Structure along same section during deposition of Middle Miocene. 



3. During deposition of Asuncion, late Upper Cretaceous. 



4. During deposition of Jack Creek formation, early Upper Creta- 

 ceous. 



(After Taliaferro, 1944.) 



sw 



Middle Miocene 

 Rhyolite flows and shallow 



Middle Miocene 

 Siliceous shales, marls, 



cherts and limestones. 



Unconformity 



•^Y^A Late Upper Cretace 

 rJ^^Asuncon Group 



Unconformity 



Lower Cretaceous 

 MarmoleJO Formation. 

 ^J-^j basal breccia. Kmb 



^SjZI Middle Miocene k. I Lower Miocene 



^■%{ Analcile Diabase- sills and | ^| Voqueros sandstone 



dikes. 



I i i i 9 1 



. Early Upper Cr«taceou» 

 .'-,^i c ,'; Jack Creek Formation 



Jurasilc 

 „ JffcJ Francican- Knoivlll* 

 d.fferent.aUd 



Horizontal Scale and Vertical Scale The Same 



