262 University of California Publications in Geology [Vol. 7 



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Fig. 2 



Figs. 1 and 2. Map of Marysville Buttes region with section showing sequence of 

 geologic formations. Al, alluvium; Nat, andesitic tuffs; Ni, lone; Tj, Tejon; Na, andesite; 

 Nr, rhyolite. Scale, y% inch = l mile. Fig. 1, areal relations of formations; fig. 2, east- 

 west section along line AB as shoivn on fig. 1. 



sun us esp 



Rl/uvium Rndesffic Cliffs lone Eocene Rndesite Rhyolite 



and breccias 



