| Moving Rocks |
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| Wednesday, 16 July 2008 | |
 The sailing stones, also referred to as sliding rocks or moving rocks, are a geological phenomenon found in Racetrack Playa, Death Valley. The stones are assumed to slowly move across the surface of the playa, inferred from the long tracks behind them, without human or animal intervention. They have neither been seen nor filmed in motion and are not unique to The Racetrack. Similar rock travel patterns have been recorded in several other playas in the region but the number and length of travel grooves on The Racetrack are notable.  Most of the so-called 'sailing stones' originate from an 850 foot (260 m) high hillside made of dark dolomite on the south end of the playa, but some are intrusive igneous rock from adjacent slopes (most of those being tan-colored feldspar-rich syenite). Tracks are often tens to hundreds of feet (low to high tens of meters) long, a few to 12 inches (8 to 30 cm) wide, and typically much less than an inch (2.5 cm) deep.
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