CORRELATION OF TERTIARY FORMAT] 
p g > 
r K ■ 
pa cc t 
3 w ! 
aT in 0"? 
on? 
— 3 
2> a < 
re P ; 
?! 
3 ■ 
^*; 
H^i 
Rhyolite. 
Erosional unconformity, Kawich, Amargosa, 
Bullfrog, Cactus, Shoshone. 
Monzonite and hiotite 
andesite. 
XX XX XXX 
Rhyolite, dacite, and la- 
the. 
asalt, contemporaneous 
with rhyolite of pre- 
ceding column. 
Erosion between rhyolite and Siebert lake' beds, 
and locally erosional unconformity between 
early Miocene rhyolite and Miocene andesite 
and dacite. 
oXXXXXX 
Andesite and dacite. 
Rhvolite and hiotite la- 
tite. 
Siebert hike beds. 
Rhyolite and latite 
folded with Siebert 
lake beds. 
^ r"2 
Orogenic movement. 
X 
X X 
X 
X . 
Later rhyolite in places 
containing augitc. not 
folded with Siebert lake 
beds. 
Mature land surface, probably here, at least, 
piv basaltic. 
Later tuffs passing into 
older alluvium. 
Basic andesites. 
xxxxxxxxxxxxxxxx 
Bull. 308—07 m- 
X X X X X X X 
Basalts in large part con- 
temporaneous with up- 
per part of older allu- 
vium, but ranging from 
Miocene to Pleistocene. 
