Detailed observations of features of natural ventifacts plus wind-tunnel studies of rocks, minerals, and artificially prepared mineral aggregates indicate how aerodynamic principles may be used as a basis for correlating both macroscopic and microscopic features on ventifacts with directions and kinds of responsible air movements. Special attention is directed to the shaping of bottom surfaces and to vortex movements of wind. Both field and laboratory data appear to support the hypothesis that many of the features of ventifacts which are attributable to wind erosion have been produced in response to collisions by suspended dust particles rather than by saltating sand grains.

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