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Saguache County Area, Colorado
<br />• RECEIVED
<br />APR 19 1999 93
<br />Division of Minerals & Geology
<br />seams, and as coatings on the bottom of pebbles;
<br />calcareous; moderately alkaline; clear smooth
<br />boundary.
<br />IICca-13 to 60 inches; extremely gravelly sand; some
<br />visible carbonates coating rock fragments;
<br />calcareous; moderately alkaline.
<br />Depth to the calcareous material ranges from 6 to 20
<br />inches. Depth to the IIC horizon and depth to the base
<br />of the argillic horizon range from 11 to 20 inches. Rock
<br />fragments are mainly 1 /2 inch to 10 inches in diameter.
<br />Des Moines Series
<br />The Des Moines series consists of deep, well drained
<br />soils that are on fans on alluvial valley floors. These soils
<br />formed in alluvium. The slope is 0 to 2 percent. The
<br />average annual precipitation is about 12 inches, and the
<br />average annual air temperature is about 41 degrees F.
<br />These soils are clayey-skeletal, montmorillonitic Pachic
<br />Argiborol Is.
<br />Typical pedon of Des Moines gravelly clay loam, 0 to 2
<br />percent slopes, about 1,700 feet east and 100 feet south
<br />of the NW corner of sec. 29, T. 42 N., R. 7 E.
<br />Al-0 to 6 inches; gray (10YR 5/1) gravelly clay loam,
<br />very dark gray (10YR 3/1) moist; weak fine granular
<br />structure; slightly hard, friable, sticky and plastic; 15
<br />percent gravel and 10 percent cobblestones; mildly
<br />alkaline; clear smooth boundary.
<br />621t-6 to 12 inches; gray (tOYR 5/1) very gravelly
<br />heavy silty clay loam, very dark gray (10YR 3/1)
<br />moist; moderate fine subangular blocky structure;
<br />hard, friable, sticky and plastic; 25 percent gravel
<br />and 10 percent cobblestones; mildly alkaline; clear
<br />smooth boundary.
<br />822t-12 to 17 inches; gray (10YR 5/1) very gravelly
<br />heavy sandy clay loam, very dark gray (10YR 3/1)
<br />moist; moderate medium subangular blocky
<br />structure; very hard, friable, sticky and slightly
<br />plastic; 40 percent gravel and 10 percent
<br />cobblestones; mildly alkaline; clear wavy boundary.
<br />C1-17 to 25 inches; light brownish gray (10YR 6/2)
<br />very cobbly sandy clay loam, dark grayish brown
<br />(10YR 4/2) moist; massive; slightly hard, friable,
<br />nonsticky and nonplastic; 30 percent gravel and 20
<br />percent cobblestones; mildly alkaline; gradual wavy
<br />boundary.
<br />C2-25 to 60 inches; light brownish gray (10YR 6/2)
<br />extremely cobbly sandy clay loam, dark grayish
<br />brown (10YR 4/2) moist; massive; slightly hard,
<br />friable, sticky and slightly plastic; 25 percent gravel
<br />and 50 percent cobblestones; mildly alkaline.
<br />The B21t horizon is a silty clay or clay loam that is 35
<br />to 50 percent rock fragments. The 822t horizon is 35 to
<br />50 percent rock fragments. The IIC horizon contains 25
<br />to 60 percent gravel and 10 to 50 percent cobblestones.
<br />Thin, nearly continuous clay films are in the B horizon.
<br />The Des Moines soils in Saguache County Area are
<br />slightly drier than the soils of the Des Moines series, and
<br />therefore, they are taxadjuncts to the series. For Des
<br />Moines soils in the survey area, the average annual
<br />precipitation is about 12 inches; but for the series, it is
<br />about 20 inches.
<br />Dunul Series
<br />The Dunul series consists of deep, somewhat
<br />excessively drained soils that are on fans and terraces
<br />on alluvial valley floors. These soils formed in very
<br />gravelly alluvium. The slope is 0 to 1 percent. The
<br />average annual precipitation is about 7 inches, and the
<br />average annual air temperature is about 41 degrees F.
<br />These soils are sandy-skeletal, mixed, frigid Typic
<br />Torriorthents.
<br />Typical pedon of Dunul very gravelly sandy loam,
<br />about 250 feet north and 50 feet west of the SE corner
<br />of sec. 35, T. 41 N., R. 7 E.
<br />Ap-0 to 6 inches; brown (tOYR 5/3) very gravelly
<br />sandy loam, dark brown (10YR 4/3) moist; weak
<br />fine granular structure; slightly hard, very friable,
<br />nonsticky and nonplastic; 50 percent gravel, 10
<br />percent cobblestones; calcareous; moderately
<br />alkaline; clear smooth boundary.
<br />C1ca-6 to 14 inches; pale brown (10YR 613) very
<br />gravelly sand, brown (10YR 4/3) moist; many
<br />distinct (10YR 8/4) coatings, and disseminated
<br />calcium carbonate; massive; loose, nonsticky and
<br />nonplastic; about 45 percent gravel, 15 percent
<br />cobblestones; calcareous; moderately alkaline; clear
<br />smooth boundary.
<br />C1-14 to 60 inches; pale brown very gravelly sand;
<br />about 45 percent gravel and 15 percent
<br />cobblestones.
<br />Depth to calcareous material and depth to the Cca
<br />horizon range from 4 to 10 inches. Rock fragments make
<br />up 35 to 75 percent of the soil protile.
<br />Garita Series
<br />The Garita series consists of deep, well drained soils
<br />on fans and foot slopes. These soils formed in
<br />calcareous gravelly alluvium derived mainly trom basalt.
<br />The slope is 0 to 35 percent. The average annual
<br />precipitation is about 7 inches, and the average annual
<br />air temperature is about 41 degrees F.
<br />These soils are loamy-skeletal, mixed, Trigid Typic
<br />Calciorthids.
<br />Typical pedon of Garita gravelly loam, 0 to 3 percent
<br />slopes, about 2,100 feet south and 1,200 feet west of
<br />the NE corner of sec. 3, T. 46 N., R. 9 E.
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