Big Southern Butte is one of two rhyolitic domes rising from a sea of basalt near the center of the eastern Snake River Plain (of the nearby Twin Buttes, East Butte is rhyolitic and Middle Butte is basaltic). The area supports lodgepole pine, aspen, Douglas fir, and manzanita (not common to this region).

The butte is one of the largest v...
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