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Moffat County Area, Colorado <br />slightly plastic; strongly effervescent; moderately <br />Range in Characteristics <br />Depth to secondary calcium carbonate: 20 to 30 <br />inches <br />Thickness of the mollic epipedon: 7 to 10 inches <br />Reaction: neutral or mildly alkaline <br />Bt horizon: <br />Hue: 7.5YR or 10YR <br />Iex ure. (:lily loam or .0tv r'iaV loam <br />Fenster Series <br />Map unit(s): 69 <br />Depth class: very deep <br />uramaye class: welt drained <br />Slowest permeability: 0.6 to 2.0 in./hr. (moderate) <br />Landform: fans, hills <br />Position on landform: footslopes, toeslopes <br />Parent material: alluvium and loess derived from <br />siitstone <br />Elevation: 6,100 to 7,200 feet (1,859 to 2,194 meters) <br />Slope: 3 to 12 percent <br />Climatic data: <br />Mean annual precipitation: 9 to 11 inches (228 to <br />279 millimeters) <br />Mean annual air temperature: 42 to 45 degrees F. <br />(5.6 to 7.2 degrees C.) <br />Frost-free period. 75 to 95 days <br />Taxonomic class: Fine-silty, mixed (calcareous), frigid <br />Typic Torriorthents <br />Typical Pedon <br />Map unit in which located.• Fenster-Thenipel complex, <br />3 to 12 percent slopes <br />Location in the survey area: about 1,900 feet west <br />and 2,200 feet north of the southeast corner of <br />sec. 18, T.10 N., R. 98 W. <br />A-0 to 2 inches; pale yellow (2.5Y 7/4) silt loam, <br />olive brown (2.5Y 4/4) moist; moderate very fine <br />platy structure; slightly hard, friable, sticky and <br />plastic; 5 percent channers; violently <br />effervescent; moderately alkaline; clear smooth <br />boundary. <br />AC-2 to 11 inches; pale yellow (2.5Y 7/4) silty clay <br />loam, light olive brown (2.5Y 5/4) moist; <br />moderate fine platy structure parting to <br />moderate very fine angular blocky; slightly hard, <br />friable, sticky and plastic; 5 percent channers; <br />335 <br />violently effervescent; strongly alkaline; gradual <br />Y. <br />C1-11 to 19 inches; very pale brown (10YR 7/4) <br />i.i.u" iaiuiii, Yi ?.iiv Yi iVii iii V??il ? -VI•T) i11V iJ 1. <br />moderate fine prismatic structure parting to <br />mnriarn!a fine cuhonnidor hinnbar- oiinhtiv ham <br />friable, sticky and plastic; 5 percent channers; <br />violentlv effervescent: moderately alkaline: <br />gradual smooth boundary. <br />C2-19 to 28 inches; very pale brown (10YR 7/4) <br />miry crap loam, yellowish UIVWi7 t it,14 n J/?! II IVI.7L, <br />weak medium subangular blocky structure; <br />Ciinhtiy harritrinhio -ctirky anti pinctin; 1[? <br />percent channers; violently effervescent; <br />!!100-cl atGiy dinailllu,'Juittidi wnuuttl buunuary. <br />C3-28 to 60 inches; very pale brown (10YR 7/4) <br />•-`- <br />S hi riw Inwm vo!!y: Irh hr-t- t- -: !1 r1VR --191 <br />7 , Tom. vi: 4:-... , v r vi 1 <br />massive; slightly hard, friable, sticky and plastic; <br />10 percent channp.rv franments- vin_IP__n_t_Iv <br />effervescent; moderately alkaline. <br />Range in Characteristics <br />Particle-size control section: <br />Rock fragment content. 5 to 10 percent channers <br />Hue: 10YR or 2.5Y <br />A horizon: <br />Reaction: moderately alkaline or strongly alkaline <br />C horizon: <br />Texture: loam, silty clay loam, or silt loam <br />Fluvaquents <br />lWap unit(s): 70, 231 <br />Local phase(s): frequently flooded <br />Depth class: very deep <br />Drainage class: very poorly drained, poorly drained <br />Slowest permeability: 0.2 to 0.6 in./hr. (moderately <br />slow) <br />Landform: lower flood plains, oxbows, flood plains, <br />depressions on stream terraces <br />Parent material: alluvium derived from mixed sources, <br />various. source alluvium <br />Elevation: 4,700 to 8,000 feet (1,433 to 2,438 meters) <br />Slope: 0 to 1 percent <br />Climatic data: <br />Mean annual precipitation: 5 to 18 inches (127 to <br />457 millimeters) <br />Mean annual air temperature: 40 to 49 degrees F. <br />(4.4 to 9.5 degrees C.) <br />Frost-free period: 65 to 140 days <br />Taxonomic class: Fluvaquents