The record-low water levels are exposing sedimentary rocks that haven’t been seen since the 1930s when the Hoover Dam was built and Lake Mead filled
Lake Mead’s falling water level has exposed several shocking things in recent months – previously sunken boats, old war ships and human remains. Now scientists are reporting a new discovery on Lake Mead’s dry bed: rocks laced with volcanic ash that rained down on southern Nevada during explosive eruptions roughly 12 million years ago. . Among these rocks, researchers with the University of Nevada in Las Vegas found ash deposits from volcanoes in Idaho, Wyoming and California.
They also found ash from eruptions only 32,000 years ago – which is not so long ago in the geological time scale. Jake Lowenstern, a research geologist with the US Geological Survey who is not involved with the study, told CNN that studying volcanic eruptions of the past can help paint a picture of future risk.
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