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.
Among these rocks, researchers with the University of Nevada in Las Vegas found ash deposits from volcanoes in Idaho, Wyoming and California.
. As of September, the lake’s water level was just 1,045 feet above sea level, or around 27% of full capacity. They found evidence of several volcanic blasts millions of years ago from places like the Snake River Plain-Yellowstone area — a tract of inactive volcanoes that stretches across Idaho along the Snake River and into what is now Yellowstone National Park — and eastern California. They also found ash from eruptions only 32,000 years ago — which is not so long ago in the geological time scale.
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