Description
"Deep furrows have been cut, like a checkerboard, taking millions of years to carve in the Navajo sandstone. The horizontal furrows were cut during the Jurassic period by wind-blown sands of the huge ancient sand dunes that spread out over the land in place of the massive monoliths you see in Zion National Park today. A freeze and thaw process is responsible for gradually widening the furrows along vertical joints. The vertical slits were formed much later after brittle rock had formed."