صخور الطف أسفنجية الشكل
Tafoni (meaning small caverns in Italian) are spectacular random pits in rocky cliffs produced by thousands of years of weathering. When water is absorbed by porous rocks, it mixes with the calcium inside the rock. As the water evaporates, it draws out some of the calcium to the surface, forming a hard layer called duricrust. This causes the remaining calcium inside the rock to be distributed unevenly. When the duricrust breaks off, erosion wears away the rock at different rates, starting with the soft parts that have the least calcium.
Common in the sandstone cliffs of Wadi Rum, Petra, and Wadi Dana.