Lake Mead
Oct. 3, 2022

Rocks not seen since the Hoover Dam was built in the 1930s are now exposed along the shrinking Lake Mead shoreline. A UNLV study revealed that many of the rocks contain ash from volcanoes
throughout the Southwest that rained down on the region as much as 12 million years ago. Researchers are determining how often Southern Nevada was inundated with ash to prepare for future events from active faraway volcanoes.