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Moffat County Area, Colorado
<br />Bk3 horizons:
<br />Texture: sandy clay loam, sandy loam, or loamy
<br />sand
<br />Willwood Series
<br />Map unit(s): 192, 210, 211, 212
<br />Local phase(s): none specified
<br />Depth class: very deep
<br />Drainage class. excessively drained
<br />Slowest permeability: 9.0 to 20 in./hr. (rapid)
<br />Landform: alluvial fans, benches, terrace
<br />escarpments, fan terraces, hills
<br />Position on landform: toeslopes
<br />Parent material: alluvium derived from mixed
<br />sources, alluvium derived from sandstone,
<br />alluvium derived from sandstone and quartzite
<br />Elevation: 5,300 to 6,000 feet (1,615 to 1,829 meters)
<br />Slope: 1 to 40 percent
<br />Climatic data:
<br />Mean annual precipitation: 7 to 10 inches (178 to
<br />254 millimeters)
<br />Mean annual air temperature: 45 to 48 degrees F.
<br />(7.2 to 8.9 degrees C.)
<br />Frost-free period: 90 to 105 days,
<br />Taxonomic class: Sandy-skeletal, mixed, mesic Typic
<br />Torriorthents
<br />Typical Pedon
<br />Map unit in which located: Willwood-Tipperary
<br />complex, 12 to 40 percent slopes
<br />Location in the survey area: about 100 feet north and
<br />1,700 feet west of the southeast corner of sec. 9,
<br />T. 10 N., R. 103 W.
<br />A1-0 to 2 inches; pale brown (10YR 6/3) very
<br />cobbly loamy fine sand, brown (10YR 4/3) moist;
<br />weak thin platy structure; soft, very friable,
<br />nonsticky and nonplastic; 25 percent gravel, 25
<br />percent cobbles; strongly effervescent;
<br />moderately alkaline; abrupt smooth boundary.
<br />A2-2 to 5 inches; pale brown (10YR 613) very
<br />gravelly loamy fine sand, brown (10YR 4/3) moist;
<br />massive; slightly hard; very friable, nonsticky and
<br />nonplastic; 40 percent gravel, 10 percent cobbles;
<br />strongly effervescent; moderately alkaline; clear
<br />smooth boundary.
<br />Bk1-5 to 11 inches; very pale brown (10YR 7/3)
<br />very gravelly loamy fine sand, brown (10YR 5/3)
<br />moist; single grained; loose, nonsticky, and
<br />nonplastic; 40 percent gravel 20 percent cobbles;
<br />calcium carbonate pendants on the underside of
<br />451
<br />many of the rock fragments; strongly effervescent;
<br />moderately alkaline; clear smooth boundary.
<br />Bk2-11 to 34 inches; very pale brown (10YR 6/4)
<br />extremely cobbly loamy sand, brown (10YR 5/3)
<br />moist; single grained; loose, nonsticky and
<br />nonplastic; 40 percent gravel, 30 percent cobbles;
<br />calcium carbonate pendants on the underside of
<br />many of the rock fragments; strongly effervescent;
<br />moderately alkaline; clear smooth boundary.
<br />C-34 to 60 inches; pale brown (10YR 6/3) extremely
<br />cobbly sand, brown (10YR 5/3) moist; single
<br />grained; loose, nonsticky and nonplastic; 40
<br />percent gravel, 30 percent cobbles; strongly
<br />effervescent; moderately alkaline.
<br />Range in Characteristics
<br />Particle-size control section (weighted average):
<br />Rock fragment content: 35 to 65 percent
<br />Note: The Willwood soil in map unit #210, Willwood-
<br />Sheppard, cool, complex, 1 to 12 percent slopes,
<br />is outside the range of the Willwood series
<br />because it has a hue of 5YR or 7.5YR in the Bk
<br />horizons.
<br />Note: In some pedons, a 3C horizon with a texture of
<br />sand is present below a depth of 30 inches to a
<br />depth of 60 inches or more. The soil is
<br />effervescent at a depth of 0 to 2 inches. The Bk
<br />horizons are absent in some pedons.
<br />A horizons:
<br />Texture: very cobbly loamy fine sand or loamy
<br />sand
<br />Bk and C horizons:
<br />Texture: extremely cobbly sand, extremely cobbly
<br />loamy sand, very cobbly sand, very cobbly
<br />loamy fine sand, very gravelly loamy fine sand,
<br />very channery loamy fine sand, or extremely
<br />channery loamy fine sand; in some pedons,
<br />the Bk1 horizon is loamy fine sand
<br />Windcomb Series
<br />Map unit(s): 243
<br />Local phase(s): none specified
<br />Depth class. very shallow to shallow
<br />Drainage class: well drained
<br />Slowest permeability: 0.2 to 0.6 in./hr. (moderately
<br />slow)
<br />Landform: cuestas
<br />Parent material: slope alluvium and/or colluvium
<br />derived from limestone over residuum weathered
<br />from sandstone and siltstone
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