Zeugen are tabular masses which have a layer of soft rocks lying beneath a surface layer of more resistant rocks. Difference in erosional effect of the wind on soft & resistant rock surfaces, carve them into weird looking ridge & furrow landscape. Mechanical weathering initiates their formation by opening up joints of the surface rocks. Wind abrasion further eats into underlying softer layer so that deep furrows are developed. The hard rocks then stand above the the furrows as ridges or Zeugen. Zeugen may stand 10 to 100 feet above the sunken furrows. Continuous abrasion by winds gradually lowers the Zeugen & widens the furrow.

Source: GC Leong