The lake's been disappearing for a long time ... it's what's left of pro-glacial Lake Bonneville. At one time it had an area of ~ 50K km^2. A lot of the salt be

The lake's been disappearing for a long time ... it's what's left of pro-glacial Lake Bonneville. At one time it had an area of ~ 50K km^2. A lot of the salt became concentrated as that lake (with no outlet) slowly evaporated. (It left the Bonneville Salt Flats behind, once famous for landspeed record-making.) https://en.wikipedia.org/wiki/Lake_Bonneville https://en.wikipedia.org/wiki/Lake_Bonneville