Mono Lake
Mono Lake in California, which is about a half an hour drive from the entrance of Yosemite National Park, is an incredibly unique area in North America. Would you believe that it's at least 760,000 years old, possibly around one million years old, making it one of the oldest lakes in the western hemisphere? Absolutely incredible! Scientists have been able to date the lake to at least 760,000 years ago by dating an ash layer to the Long Valley eruption . However, sediments below the ash layer suggest that Mono Lake could actually be the remnant of a much older lake that also covered parts of Nevada and Utah. At its height, Mono Lake was about 900 ft deep. It sits in part of the Mono Basin, which was formed over the last five million years, and has no outlet to the ocean; this lack of an outlet causes high levels of salt to accumulate in the lake, making the water more alkaline . However, now the lake is about 158 ft deep at its deepest point an...