EASTERN SNAKE RIVER
PLAIN
Idaho's Snake River Plain
has several large basalt lava fields as well as some isolated volcanoes that
rise conspicuously above the general surface of the plain. Big Southern
Butte (see pic below) is a ~300 ky volcanic dome consisting principally of
rhyolite lavas.
Above: Big Southern Butte (see
map), way in the distance, as seen from Rt. 20 in southeastern Idaho.
The Twin Buttes are a
closely-spaced pair of volcanic domes on the southern side of Rt. 20.
Above & below: Twin Buttes, consisting of
Middle Butte (on the right) and Eastern Butte (on the left). Looking ~SE.
Above: Middle Butte (see
map), a volcanic dome consisting principally of rhyolite & basalt
lavas. Looking ~SE.
Above: Eastern Butte (see
map), a ~600 ky volcanic dome consisting principally of rhyolite
lavas. Looking ~SE.