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JG1S83 dominantly 46-480F. Grass, northern desert shrub and pinyon-juniper on slopes of 1 to 15 percent are the most extensive cover types. There are nine map units in this group. The largest is unit 9 which occupies 3.5 percent of the basin and along with unit 10 constitutes a large acreage of deep and moderately deep soils formed in wind deposits. Ot~er extensive soIl parent materials within the group are shale, sandstone, outwash, and alluvial deposits. Major Great __ Groups are: Argiustolls, Haplustolls, Haplargids, Camborthids, Torriorthents, Torripsamments, and Torrifluvents. These soils have a climate suitable for both dry and irrigated crop- land production although at present grazing is the chief land use. There is a medium to high potential for irrigation except for soil units 13 and 15 which have significant components of shallow soils and land types. Group III: Soils of Warm Subhumid Mountain Regions (BLUE) Soils of this group are all within map unit 18 which is confined to New Mexico and Colorado. It constitutes 2.0 percent of the basin. Mean annual precipitation ranges from 15 to 25 inches and there is a frost-free period of 100 to 150 days. Elevations are from 6,200 to 8,000 feet and the mean annual temperatures are 46 to 480F. ~ Pinyon-juniper and Montane Forest are the dominant cover types, but northern desert shrub and mountain brush are on significant acreages. Moderately deep and shallow soils are typical of the group. Most of the soils have formed over shale or sandstone but some are in colluvial and alluvial deposits. Slopes are chiefly from 5 to 40 percent. Major Great Groups are: Argiustolls, Haplustolls, Hap- largids, Haplustalfs, and Argiborolls. About 25 percent of the area consists of land types such as rockland and canyons. These soils are used mainly fpr .grazing and have a low potential for irrigation because of lack of effective depth and steep irre- gular slopes. 111-16