Transported as much as 5 km and deposited in large dune-like mounds, whirlwinds, dry convective helical vortices, move large gypsum crystals in the Andes Mountains of northern Chile. This marks the first occurrence of gravel-sized grains moved efficiently in air by suspension.

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Transported as much as 5 km and deposited in large dune-like mounds, whirlwinds, dry convective helical vortices, move large gypsum crystals in the Andes Mountains of northern Chile. This marks the first occurrence of gravel-sized grains moved efficiently in air by suspension.