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SOIL SURVEY tial for urban development is only fair to poor. The main limitations are moderate to high shrink swell, low strength, and slow permeability. The potential is fav for development of openland wildlife habitat. 3. Weld-Colby Deep, nearly level to moderately sloping, well drained looms formed in calcareous eolian deposits This nearly level to moderately sloping map unit is on plains mainly in the southeastern part of the survey area. One small area is in the west-central part The unit makes up about 10 percent of the total acreage. About 50 per- cent is Weld soiL9, 35 percent is Colby soils, and 15 per- cent is soils of minor extent. Weld soils occupy the broad neazly level areas. Colby soils occupy the steeper side slopes. Weld soils have a loam surface layer and a clay and clay loam subsoil Colby soils have a loam surface layer and silt loam underlying material Minor in this unit are the well drained Adena and Kim soils. This map unit is used mainly for crophmd. About 65 percent is nonirrigated. Winter wheat is the principal crop. If irrigated, the soils are well suited to all commonly grown crops. The potential is fair for development of openland wildlife habitat. 4. Wiley-Colby-Weld Deep, nearly level to moderately sloping, well drained silt foams and foams formed in calcareous collar deposits This neazly level to moderately sloping map unit is on plains in the west-central and southwestern parts of the survey area It makes up about 5.5 percent of the total acreage. About 30 percent is Wiley soils, 30 percent is Colby soils, 15 percent is Weld soils, and 25 percent is soils of minor extent. Wiley and Colby soils form an intermingled complex pattern on the steeper side slopes. Weld soils are along the narrow ridgetops and on the nearly levet side slopes. Wiley soils have a silt loam surface layer and a silty clay loam subsoil Colby soils have a loam surface layer and silt loam underlying material Weld soils have a loam saz- face layer and a clay loam subaoD. Minor in this unit are the moderately well drained Heldt soils and the well drained Nunn and Ulm soiLc This map unit is used mainly for crophmd. About 70 percent is irrigated and is well suited to all commonly grown crops. In nonirrigated areas, winter wheat is the principal crop. The potential is fair for urban develop- ment. Moderately slow permeability is the main limita- tion The potential is also fair for development of open- land wildlife. 5. Olney-Kim-Otero Deep, nearly level to moderately sloping, well drained sandy foams and loans farmed in mixed. alluvium and collar deposits This nearly level to moderately sloping map unit is on phuns and alluvial fans throughout the survey area. It makes up about 23.5 percent of the total acreage. About 35 percent is Olney soils, 20 percent is Kim soils, 15 per- cent is Otero soils, and 30 percent is soils of minor extent The soils in this map unit occupy the same relative positions on the landscape (fig. 2). Olney soils have a loamy sand or sandy loam surface layer and a sandy clay loam subsoz7. Kim soils have a loam surface layer aml loam and fine sandy loam underlying material Otero soils have a sandy loam surface layer and fine sandy loam un- derlying material Minor in this unit are the well drained Ascalon, Nelson, Thedalund, and Vona soils. This map unit is used for irrigated and nonirrigated cropland and for rangeland. The potential is good for urban development and fair for wildlife habitat 6. Otero-Thedalund-Nelson Deep and moderately deep, nearly level to moderately sloping, well drained sandy foams and clay foams formed in alluvium and eolian deposits and in residuum from shale and sandstone This neazly level to moderately sloping map unit is on pbuns in the north-central part of the survey area. It makes up about 3 percent of the total acreage. About 35 percent is Otero soils, 25 percent is Thedaland soils, 25 percent is Nelson soils, and 15 percent is soils of minor extent Otero soils are on the nearly level or smoother side slopes. Thedalund and Nelson soils are intermingled and are on the steeper side slopes. Otero soils have a sandy loam surface layer and fine sandy loam underlying material Thedalund soils have a loam surface layer and underlying material Shale is between depths of 20 and 40 inches. Nelson soz7s have a fine sandy loam surface layer and underlying material. Sandstone is between 20 and 40 inches. Minor in this unit are the well drained Kim, Renohill, Terry, and Vona soils. This map unit is used mainly for irrigated cropland. Soil depth is the main limitation in farming and urban development The potential is fair for development of openland wildlife habitat 7. Tassel-Thedalund-Terry Shallow to moderately deep, gently sloping to strongly sloping, well drained sandy foams to clay foams Jormed in residuum from sandstone and shale This gently sloping to strongly sloping map unit is in the western part of the survey area, ac(jacent to and in- cluding the sandstone breaks along some of the major strnnmc It makes up about 1 percent of the total acreage. About 50 percent is Tassel soils, 20 percent is Thedalund soils, 20 percent is Terry soils, and 10 percent is soi] of minor extent.