Coso rock art - National Park Service
Coso's volcanic nature is evident in such features as this cinder cone, formed when ash and small bits of rock were blasted from a vent in a fountain-like jet. Tephra, as the material is known, piles up around the vent as it falls to the ground, leaving a steep-sloped cone. Some cones at Coso are thought to be less than 500 years old. ................
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