Unusual ground markings or UGMs are ground features that appear to be hard to explain. The best-known UGMs are crop circles. Other forms of UGM are ice circles, footprints of unknown origin and burnt grass. At some Unusual Ground Markings there is said to be a higher level of radioactivity than the background of the surroundings. Unusual ground markings are sometimes interpreted as landing traces of UFOs or as footprints from cryptozoological animals or extraterrestrial aliens, while for skeptics most of them are fakes. ;Notable unusual ground markings * The in Devon, UK in the middle of the 19th century * The cross in the grass at Eisenberg an der Raab * The faces of Bélmez * Crop circles * Close encounters of the 2nd kind (CE-2), in which a UFO leaves ground traces, even radioactivity.
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