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Sliding Rocks on Racetrack Playa, Death Valley National Park: First Observation of Rocks in Motion

Figure 8

Racetrack Playa phenomena.

Parts show: (a) thin windowpane ice over-riding a recently moved rock (January 9, 2014), (b) water creeping onto the low gradient northern shore of the pond during the December 20, 2013 rock movement (∼11:15 am), (c) ice windrows on the eastern shore of Racetrack Playa near the weather station (∼1 pm, December 20, 2013); ice panels are ∼2–3 mm thick and mixed with mud and rocks scoured from the pond bottom, (d) rock carving a wake through ice that is moving left to right; open rippled water in the foreground (January 9, 2014). Images have been cropped but not otherwise edited.

Figure 8