RIPPLES STRATA IN GYPSUM SAND DUNES<br />
Hydrous Form of Calcium Sulfate<br />
(White Sands, NM)<br />
Rarely found in sand form because of its solubility. But Tularosa Basin, is not drained by a river so that gypsum &amp; other sediments dissolved from surrounding mountains are trapped in the basin. Ripple patterns are formed by wind.