Groups named, physically distinct rock formations and landforms produced by geological processes: formally named stratigraphic rock units such as a distinctive sandstone or shale bed, and named landform structures shaped by geology such as canyons, mesas, fault-block mountains, karst features and volcanic necks. Belongs here: a specific, individually named geological formation or landform recognized as a distinct feature of the Earth's crust. Does not belong here: the general processes that shape formations, such as erosion or plate tectonics (Processes), the minerals and rock types formations are composed of (Materials), transient or event-like natural occurrences such as earthquakes or eruptions (Phenomena), geological time periods (Eras), and the scientists who study formations (Scientists).