Existing comment:
Wind and Water:
Wind is an obvious force in Petrified Forest. It has been clocked blowing across the desert at up to 85 miles an hour. As an agent of erosion, it is most important in moving small particles of dust and sand already broken down by water. Rocks and pieces of petrified wood have been literally sand-blasted into "ventrifacts," triangular-shaped rocks with facets like cut gemstones. |