Lichen at Weeping Rock in Zion national park, Utah. Weeping Rock is an overhanging blind arch which “rains” every day of the year. The spring water seeping out of the rock 100 feet overhead takes nearly 1000 years to travel through the porous Navajo sandstone above. The percolation slows at the underlying dense, less porous Kayenta sandstone layer, then follows a downhill course, raining on the observers below. The lichen on the cliff walls are very colorful.