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<br /> <br />agricultural lime, wallstone, and as a filler in various other <br /> <br /> <br />products. <br /> <br /> <br />A limestone known as "native lime" occurs in the upper <br /> <br /> <br />layers of bedrock at a number of places in the Loup Subbasin. It <br /> <br /> <br />has been quarried in considerable quantities near Scotia for use <br /> <br /> <br />in chemical manufacturing and to some extent for local building <br /> <br /> <br />material. <br /> <br />Clay <br />Clays occur in many geological formations and have a wider <br />distribution than most other commercial minerals. They are used <br />for a variety of products - brick, tile, cement, lightweight ag- <br />gregate, and pottery. Most of the clay is mined from open pits <br />in the eastern part of the basin. <br /> <br />Volcanic Ash <br /> <br />Volcanic ash, a light grayish colored material used primarily <br />as a scouring agent in cleansers, occurs quite widely in the basin <br />in beds varying in thickness from a few inches to 18 feet or more. <br />Commercial production is limited to one plant located near Callaway, <br />which operates only periodically. <br /> <br />PAST, PRESENT AND PROJECTED SOCIOECONOMIC CHARACTERISTICS <br />American Indians were the first human occupants of the <br />Great Plains area, including Nebraska. Most Plains Indian tribes <br />were nomadic, following the bison herds, although other tribes such <br />as the Omahas were less mobile. French explorers including <br />Bourgmond and the Mullets visited this area in the early 1700's. <br /> <br />2-16 <br />