>>> TUFA: a porous rock composed of calcium carbonate and formed by precipitation from water, e.g., around mineral springs.
Mono Lake is a majestic body of water covering about 65 square miles. It is an ancient lake, over 1 million years old -- one of the oldest lakes in North America. It has no outlet.
Throughout its long existence, salts and minerals have washed into the lake from Eastern Sierra streams. Freshwater evaporating from the lake each year has left the salts and minerals behind so that the lake is now about 2 1/2 times as salty and 80 times as alkaline as the ocean.
Most of these wonderful Tufa Formations are now back under the water as Los Angeles was finally ordered to stop diverting ALL of the water that flowed from the Sierras into this closed lake. The Stars are all circling the North Star, which is the white dot in the upper left.