Wed Night: Lookout Mountain
Lookout Mountain is a rhyolite dome that began to form 600,000 years ago after the cataclysmic eruption from the Long Valley Caldera. This eruption left much of what is now southern Mono County under a mantle of rhyolitic lava and ash. Some of the material ejected from the dome's 15 volcanic vents was obsidian: volcanically-formed glass which was used by the basin's earliest inhabitants for making razor-sharp tools and for fashioning into objects of ceremony and beauty.
