|The 'Chocolate Hills' on the island of Bohol in the Philippines get their name because the 1,700 naturally|
formed mounds are covered with chocolate brown grass in the dry season
The Vermilion Cliffs are the second "step" up in the five-step Grand Staircase of the Colorado Plateau. Reddish or vermilion-colored cliffs are found along U.S. Highway 89 and U.S. Highway 89A near Kanab, Utah (and near Navajo Bridge in Arizona). These are made up of deposited silt and desert dunes, cemented by infiltrated carbonates and intensely colored by red iron oxide and other minerals, particularly bluish manganese. In the spring, after a good winter rain, the valley between Highway 89 and the Vermilion Cliffs will be covered with a carpet of desert mallow and other spring flowers. It is such a wonderful place to explore!
|The Vermilion Cliffs of the Paria Canyon wilderness in the U.S.|
The Richat Structure, also known as the Eye of the Sahara and Guelb er Richat, is a prominent circular feature in the Sahara desert of west–central Mauritania near Ouadane. This structure is a deeply eroded, slightly elliptical, 40-km in diameter, dome. The sedimentary rock exposed in this dome range in age from Late Proterozoic within the center of the dome to Ordovician sandstone around its edges. It has attracted attention since the earliest space missions because it forms a conspicuous bull's-eye in the otherwise rather featureless expanse of desert. It is initially interpreted as an asteroid impact structure because of its high degree of circularity; it is now argued to be a highly symmetrical and deeply eroded geologic dome.
|The Richat Structure of Guelb er Richat in Mauritania. Originally thought to be a meteorite impact, |
it is now known to be a volcanic bulge that never erupted and was leveled by erosion