       National Geographic Photo of the Day: Mono Lake&#039s Tufa

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Photo of the Day   March 16, 2007    PREVIOUS [4]   |  NEXT [5]
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Mono Lake, California, 1982 Photograph by James P. Blair Spires of
limestone tufa rise from the shores of California's Mono Lake. Tufa
form when underwater springs rich in calcium meet lake water rich in
carbonates, forming calcium carbonate, or limestone. The limestone
precipitates in layers over time and can grow more than 30 feet (9
meters) high. Mono Lake's tufa are particularly dramatic because water
diversions have significantly lowered the lake's level, exposing more
of the columns.

(Photograph shot on assignment for, but not published in, the National
Geographic special publication, Our Threatened Inheritance, 1982.)
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