Roadside Geology of Utah Author:Halka Chronic No one can ignore the colorful rocks of Utah: the Vermilion Cliffs of Wingate sandstone, the snow white and salmon pink bluffs of Navajo sandstone, or the yellow and pink rhyolite of Big Rock Candy Mountain. Roadside Geology of Utah is a riveting account of the forces that made the brilliant cliffs, mountains, and canyonlands we see today.