The exact processes that create “turtle rocks” are poorly understood. One explanation involves spheroidal weathering. This process occurs when water, percolating through cracks and between individual grains in the rock, loosens and separates layers of the rock. The weathering acts more rapidly on the corners and edges of the rock producing a rounded shape. The weathering of the rocks is also strongly influenced by the polygonal joint pattern seen in all “turtle rocks”. from Arkansas Geological Survey
You can walk over and through these intriguing geologic features on the trail to the Rock House Cave in Petite Jean State Park in Arkansas.
Canon EOS Rebel T1i
Tokino 18-270mm lens