The occasion is the semiannual pupfish count in Ash Meadows, Nev ., a 24, 000-acre oasis of clay dunes, spring-fed pools, and plants and animals found nowhere else in the world.
2.
Fixed crescentic dunes that form on the leeward margins of playas and river valleys in arid and semiarid regions in response to the direction ( s ) of prevailing winds, are known as lunettes, source-bordering dunes, bourrelets and clay dunes.
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