You can read about it here.
From the "dust jacket" of the book:
24,000 years ago during the last ice age, what is now White Sands National Monument in southern New Mexico was then a 1,600 square mile lake which geologists have named Lake Otero. Gradually the weather became drier and warmer as the ice age retreated, and the gypsum that had been dissolved in the lake deposited out as the lake dried up, leaving the modern-day pure white dunes of gypsum sand.
At the southern end of this range of dunes on what is now part of the White Sands Missile Range, the sands have drifted, exposing something that should not have been there.
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Don't have a Kindle? No problem, Amazon has free Kindle apps for most devices. You can download them at this site:
http://www.amazon.com/gp/feature.html/ref=kcp_ipad_mkt_lnd?docId=1000493771
Cheers,
--Doug
