Lassen's Painted Dunes
The Painted Dunes are multicolored pumice fields formed by oxidation of volcanic ash as they fell out of volcanic eruptions that have sculpted the area inside Lassen National Park in Northern California. The ash on Painted Dunes is brightly oxidized because it fell on lava flows when they were still hot. The Painted Dunes are best viewed during the "golden hour," from the top of Cinder Cone, a 700-foot-tall cinder cone volcano that’s believed to have last erupted in the 1650s.