The Dakota Sandstone (also Cockrum Sandstone, Dakota Formation) is a general term for an ill-defined early Cretaceous formation of the Rocky Mountains and Great Plains. The Cretaceous (kriːˈteɪʃəs, usually abbreviated 'K' for its German translation "Kreide" is a geologic period and system, reaching from the end of Mountain peaks of the Rocky Mountains The Rocky Mountains, often called the Rockies, are a Mountain range in western North America. The Great Plains are the broad expanse of Prairie and Steppe which lie east of the Rocky Mountains in the United States and Canada It consists of sandy, shallow-marine deposits with intermittent mud flat sediments, and occasional stream deposits. Sand is a naturally occurring Granular material composed of finely divided rock and Mineral particles Marine is an Umbrella term. As an adjective it is usually applicable to things relating to the Sea or Ocean, such as Marine biology, Marine In computer gaming, a MUD ( Multi-User Dungeon, Domain or Dimension) is a multi-player computer game that combines elements of A stream is a body of Water with a current, confined within a bed and stream-banks [1],[2] It is an important aquifer in some areas of the Great Plains. An aquifer is an underground layer of Water -bearing Permeable rock or unconsolidated materials ( Gravel, Sand, Silt, or Clay [3],[4]It is made of porous sandstone more than 30 meters thick.