A type of ventifact formed in arid, desert environments where prevailing winds blow abrasive sand against loose surface rocks. Over long periods, the sandblasting wears flat faces into the stone. When the wind direction changes or the rock shifts, multiple intersecting planes are cut, creating a characteristic three-ridged pyramid shape.
Heard on the job
The basal conglomerate layer is packed with dreikanters, proving this area was a desert before the sea moved in.
Do not mix it up with
- Einkanter: An einkanter has only one wind-polished face, while a dreikanter has three.