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  • Ordovician age groups of rock which are largely dolomite with a shaly zone near the middle and some limestone beds in the lower portion.
  • Computer software used to input, store, retrieve, manipulate, analyze and output geographically referenced data or geospatial data, often in the form of maps, in order to support decision making for planning and management of land use, natural resources, environment, urban facilities, transportation, and other administrative records.
  • The study of the planet Earth that is concerned with its origin, composition, and form; its evolution and history; and the processes that acted (and act) upon it to control its historic and present forms.
  • Study of the Earth with quantitative physical methods. Application of the principles of physics to the study of the earth, especially its interior.
  • A collective term for the geologic processes of glacial activity, including erosion and deposition, and the resulting effects of such action on the Earth's surface.
  • A large, slow-moving mass of ice formed on land by the accumulation, compaction, and recrystallization of snow.
  • The Glenwood formation is a characteristically poorly sorted sandstone, impure dolomite, and green shale of Ordovician age. It overlies the Ordovician-age St. Peter Sandstone in northern Illinois. The St. Peter consists of well sorted, frosted, friable quartz sand.
  • A part of a surface feature of the Earth that slopes upward or downward; the angle of slope, as of a stream channel or of a land surface, generally expressed by a ratio of height versus distance, a percentage or an angular measure from the horizontal.
  • A plutonic rock in which quartz constitutes 10 to 50 percent of the felsic components and in which the alkali feldspar/total feldspar ratio is generally restricted to the range of 65 to 90 percent.
  • Water present below the water table in small, often microscopic, interconnected pore spaces between grains of soil, sand and/or gravel, and in open fractures and/or solution channels in rock.