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<br />Huerfano County Area, Colorado
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<br />sediment. The surface layer is medium textured. The
<br />subsoil is moderately fine textured. Below this, to a
<br />depth of 60 inches or more, the soils are medium
<br />textured.
<br />Bond soils are on ridges. These soils are shallow and
<br />well drained. They formed in residuum derived
<br />dominantly from sandstone. The surface layer is
<br />moderately coarse textured. The subsoil is moderately
<br />fine textured. Unweathered sandstone is at a depth of 17
<br />inches.
<br />Of minor extent in this unit are Ring, Olney, Progresso,
<br />Louviers, and Travessilla soils. The Ring soils are deep
<br />and cobbly. The Olney soils are deep. The Progresso
<br />soils are moderately deep over sandstone. The Louviers
<br />and Travessilla soils are shallow. They are on steep side
<br />slopes and ridges.
<br />Most areas of this unit are used as rangeland. A few
<br />areas are used for irrigated and nonirrigated crops. Hay
<br />and pasture are the main irrigated crops, and wheat is
<br />the main nonirrigated crop.
<br />This unit is well suited to irrigated hay and pasture.
<br />The main limitations are insufficient moisture for annual
<br />cropping and the hazard of soil blowing.
<br />Wildlife such as mule deer, mourning dove, cottontail,
<br />skunks, porcupine, coyote, and limited numbers of turkey
<br />inhabit this unit. Areas used as cropland provide
<br />additional food and cover.
<br />If this unit is used for homesite development, the main
<br />limitation is the shallow depth to bedrock in the Bond
<br />soils.
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<br />10. Willowman-Curecanti-Nunn
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<br />Deep, well drained, gently sloping to moderately steep
<br />soils; on fans, terraces, and side slopes
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<br />This map unit is in the west and southwestern parts of
<br />the survey area. Slope is 2 to 30 percent. The vegetation
<br />is mainly grass. Some Gambel oak is on the side slopes.
<br />Elevation is 6,500 to 8,200 feet. The average annual
<br />precipitation is about 16 to 20 inches, the average
<br />annual air temperature is 40 to 52 degrees F, and the
<br />average frost-free season is 75 to 130 days.
<br />This unit makes up about 8 percent of the survey area.
<br />It is about 25 percent Willowman soils, 20 percent
<br />Curecanti soils, and 15 percent Nunn soils. The
<br />remaining 40 percent is components of minor extent.
<br />Willow man soils are on terraces and fans. These soils
<br />are deep and well drained. They formed in alluvium
<br />derived dominantly from sandstone and igneous rock.
<br />The surface layer is gravelly and moderately coarse
<br />textured. The subsoil is very cobbly and moderately fine
<br />textured. Below this, to a depth of 60 inches or more,
<br />the soils are very cobbly and moderately coarse
<br />textured.
<br />Curecanti soils are On terraces, fans. and side slopes.
<br />These soils are deep and well drained. They formed in
<br />alluvium derived dominantly from mixed sediment. The
<br />surface layer is very cObbly and medium textured. The
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<br />subsoil is very cobbly and moderately fine textured.
<br />Below this, to a depth of 60 inches or more, the soils are
<br />very cobbly and coarse textured.
<br />Nunn soils are on terraces and fans. These soils are
<br />deep and well drained. They formed in alluvium derived
<br />dominantly from mixed sediment. The surface layer is
<br />medium textured. The subsoil is fine textured. Below this,
<br />to a depth of 60 inches or more, the soils are medium
<br />textured or moderately fine textured and have a few rock
<br />fragments.
<br />Of minor extent in this unit are Morop, Noden, Denver,
<br />and Ring soils. The Morop soils have rock fragments in
<br />the substratum. The Noden and Denver soils do not
<br />have rock fragments. The Ring soils are on the steeper
<br />side slopes.
<br />Most areas of this unit are used as rangeland. A few
<br />areas of the Nunn soils are used as irrigated and
<br />non irrigated cropland. Hay and pasture are the main
<br />irrigated crops. Small grain such as oats and barley are
<br />the main non irrigated crops.
<br />If this unit is used as irrigated or nonirrigated cropland,
<br />the main limitations are the short growing season and
<br />some rock fragments on the surface.
<br />Wildlife such as mule deer. cottontail, jackrabbit,
<br />mourning dove, bobcat, badger, skunk, and coyote
<br />inhabit this unit. Limited numbers of elk also inhabit the
<br />unit in winter. Areas used as cropland provide additional
<br />food and cover.
<br />The Willowman and Curecanti soils in this unit are well
<br />suited to homesite development. The Nunn soils are
<br />limited by high shrink-swell potential.
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<br />11. Brownsto-Castner-Patent
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<br />Shallow to deep, well drained, gently sloping to
<br />extremely steep soils; on fans. foot slopes, side slopes.
<br />ridges, and mountainsides and in swales
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<br />This map unit is in the western part of the survey area.
<br />Slope is 2 to 75 percent. The vegetation on the Castner
<br />and Brownsto soils is mainly pinyon and juniper. The
<br />vegetation on the Patent soils is mainly grass. Elevation
<br />is 6,700 to 8,600 feet. The average annual precipitation
<br />is about 12 to 16 inches. the average annual air
<br />temperature is 42 to 47 degrees F, and the average
<br />frost-free season is 80 to 120 days.
<br />This unit makes up about 8 percent of the survey area.
<br />It is about 35 percent Brownsto soils, 25 percent Castner
<br />soils, and 10 percent Patent soils. The remaining 30
<br />percent are components of minor extent.
<br />Brownsto soils are on mOuntainsides, foot slopes, and
<br />fans. These soils are deep and well drained. They
<br />formed in alluvium and colluvium derived dominantly
<br />from sandstone. The soils are very channery and very
<br />gravelly throughout. The surface layer is medium
<br />textured. Below this, to a depth of 60 inches or more,
<br />the soils are mainly moderately fine textured.
<br />Castner soils are on side slopes and ridges. These
<br />soils are shallow and well drained. They formed in
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