Caprock Dependence
Sunlight illuminates a group of standing rocks in Monument Basin (aka Standing Rocks Basin) in Canyonlands National Park. The multilayered red rock of the pillars consists of Organ Rock Shale, formed by deposits from streams and tidal flats 250 million years ago. The white caprock is White Rim Sandstone, derived from sand dunes. Once the harder caprock is lost the pillars erode into shorter needles, as seen on the formation to the right of the pillars.
Caprock Dependence
Sunlight illuminates a group of standing rocks in Monument Basin (aka Standing Rocks Basin) in Canyonlands National Park. The multilayered red rock of the pillars consists of Organ Rock Shale, formed by deposits from streams and tidal flats 250 million years ago. The white caprock is White Rim Sandstone, derived from sand dunes. Once the harder caprock is lost the pillars erode into shorter needles, as seen on the formation to the right of the pillars.