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<br /> <br />I <br /> <br />. <br /> <br />I <br /> <br />I <br /> <br /> <br />... <br />~........ <br />- .. <br /> <br />"'- <br /> <br />........ <br /> <br />- <br /> <br />- <br /> <br />I <br /> <br />. <br /> <br />....,...~.-.'. <br />.' . ~ .. '.~.....- '. ". <br />. ..." . __ .,~. ,4", .... <br />.<t--'\a . . .~ -..:,11.,,' ~~'. '.. . <br />:'to' il:.,~...:.w. ....~: ....<~~~\o. ...,... .. <br />..~ .,\t.":t. '~~."... "0<:"3 <br />~ . "~.. <br />~, -. . <br />-l.."-. ~. j}J. rc:. . ~.~ <br />, ....,.\.. ~.. .,'!-'..~ <br />~t ",-r~... s ~ ~. - ~.:c.:. <br />~. ~.. '.., .. ....... <br />..'... ." ..- -,. . ",,-;"", '. <br />, ~'",t N --'~"~~r' <br /> <br />~-~....;.;,.~ <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Desert rangeland <br />(Soil Mapping Unit 1) <br /> <br />I <br /> <br />I <br /> <br />Soils of unit 1 have formed under a lo~ effective annual precipitatio~ <br />that varies from 8 to 12 inches. Elevations range from 5,200 to 6,200 <br />feet. The mean annual temperature is about 4]Q F. and the frost-free <br />period at Rangely, which is considered representative, is 124 days. <br /> <br />I <br /> <br />Soil parent materials are mainly calcareous, clayey shales and sandstones. <br />However, sandy and gravelly outwash, wind-blown sands and silts, and <br />alluvial sediments are also extensive. <br /> <br />I <br /> <br />I <br /> <br />The soils are chiefly shallow over sandstone or shale, but deep soils <br />have formed in alluvial and wind-blown deposits that extend over <br />bottomlands, terraces and mesas. <br /> <br />I <br /> <br />Surface soils are light colored and range in texture from sandy loam <br />to silty clay. Subsoils are principally clay loam, silty clay loam, <br />or clay in texture and have a moderate to slow permeability rate. <br />Sandy subsoils with a rapid permeability rate are a minor component <br />within the unit. Generally, these soils have an alkaline reaction <br />and are limy at or within a few inches of the surface. Some soils <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />- 14 . <br /> <br />I <br /> <br />