dreikanter
dreikanter

A “dreikanter” is a particular kind of “ventifact” – a rock modified by (thousands or millions of years of) wind erosion and scouring. That kind of erosion is caused by small abrasive particles such as sand, carried by the wind. Frequently, the wind is so directional that the abraded rock develops a “keel” which is parallel to the prevailing wind, plus what may look like faceting.

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Source: Arrowhead and Angular Shapes - ArrowHea…
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