Definitions for ventifactˈvɛn təˌfækt
This page provides all possible meanings and translations of the word ventifact
Random House Webster's College Dictionary
a pebble or cobble that has been faceted, grooved, and polished by the erosive action of wind-driven sand.
Origin of ventifact:
1911; < L venti-, comb. form of ventuswind1+(arti)fact
A pebble or little stone shaped and polished by wind-blown sand.
Ventifacts are rocks that have been abraded, pitted, etched, grooved, or polished by wind-driven sand or ice crystals. These geomorphic features are most typically found in arid environments where there is little vegetation to interfere with aeolian particle transport, where there are frequently strong winds, and where there is a steady but not overwhelming supply of sand. Ventifacts can be abraded to eye-catching natural sculptures. In moderately tall, isolated rock outcrops, mushroom shaped pillars of rock may form as the outcrop is eroded by saltating sand grains. This occurs because, even in strong winds, sand grains can't be continuously held in the air. Instead, the particles bounce along the ground, rarely reaching higher than a few feet above the earth. Over time, the bouncing sand grains can erode the lower portions of a ventifact, while leaving a larger less eroded cap. The results can be fantastic stone mushrooms. Individual stones, such as those forming desert pavement, are often found with grooved, etched, or polished surfaces where these same wind driven processes have slowly worn away the rock. When ancient ventifacts are preserved without being moved or disturbed, they may serve as a paleo-wind indicators. The wind direction at the time the ventifact formed will be parallel to grooves or striations cut in the rock. Jake Matijevic is an example for a Martian ventifact. By analiysing its shape, it was possible to reconstruct the main wind direction, by which the rock was formed.
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