Angel Rock from Antelope Canyon(Mojave Desert) U.S.A. Medium sized stones.

Antelope Canyon consists of two small canyons, called Lower Antelope Canyon and Upper Antelope Canyon. These are so-called slot canyons. These are narrow gorges carved out by water or mud. The Antelope Canyons are located on a Navajo reservation near the village of Page, Arizona, near Lake Powell. The Upper Antelope Canyon is about 400 meters long and 44.3 meters deep. Special light effects can be seen here, because in a number of places the sun's rays shine through narrow openings. The closing of the Iapetus Ocean during the Devonian created the Appalachians. From this moment the erosion of this mountain range also starts. A lot of erosion material comes via the trade winds to the center of what we now call the United States. By analogy with the Sahara, a huge or enormous sea of sand is created. Increasing pressure (diagenesis) creates sandstone, better known as Navajo Sandstone. A canyon is created in this rock by erosion. Because rainwater quickly collects in basins upstream during the monsoon seasons, the enormous amount of rainwater flows through the valley together with the sediment, creating mudslides. At the narrowings of the canyons, these erode the canyon further. In addition, the wind has done its job. This caused the soft types of stone to be worn away and the harder types to be polished.