LOCATION MUDDUCK                 WY

Tentative Series
Rev. DPG/DJP/RJS
04/2016

MUDDUCK SERIES

The Mudduck series consists of very deep, well drained soils that formed in slope alluvium and colluvium derived from sandstone and shale. These soils are on hillslopes. Slopes are 8 to 35 percent. Mean annual precipitation is about 300 mm, and mean annual air temperature is about 4.0 degrees C.

TAXONOMIC CLASS: Fine, smectitic, calcareous, frigid Torrertic Ustorthents

TYPICAL PEDON: Mudduck clay loam, in rangeland (colors are for dry soil unless otherwise noted).

A--0 to 10 cm; brown (7.5YR 4/4) clay loam, dark brown (7.5YR 3/3), moist; weak very fine granular structure; friable, slightly hard, very sticky, very plastic; few fine roots; few fine irregular pores; finely disseminated carbonate; violently effervescent; moderately alkaline (pH 8.0); abrupt wavy boundary. (5 to 10 cm thick)

C1--10 to 30 cm; pinkish gray (5YR 6/2) clay loam, gray (5YR 5/1), moist; massive; friable, slightly hard, very sticky, very plastic; few fine roots throughout; few fine irregular pores; finely disseminated carbonate; violently effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (13 to 80 centimeters thick)

C2--30 to 60 cm; weak red (10R 5/3) clay, weak red (10R 4/2), moist; massive; firm, moderately hard, very sticky, very plastic; very few medium roots; few fine irregular pores; finely disseminated carbonate; violently effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (20 to 144 cm thick)

C3--60 to 152 cm; pale yellow (5Y 8/4) clay, pale yellow (5Y 7/3), moist; massive; firm, moderately hard, very sticky, very plastic; few fine irregular pores; finely disseminated carbonate; violently effervescent; moderately alkaline, (pH 8.4).

TYPE LOCATION: Lincoln County, Wyoming; USGS Woodruff Narrows, Utah topographic quadrangle; 41 degrees 36 minutes 36.96 seconds north latitude and 111 degrees 0 minutes 52.37 seconds west longitude.

RANGE IN CHARACTERISTICS:
Mean annual soil temperature - 3.2 to 6.7 degrees C.
Ochric epipedon thickness - 5 to 10 cm
Vertic features - cracks that are 5 mm or more within 125 cm of the mineral soil surface and/or a linear extensibility of 6.0 cm or more

A horizon
Hue: 5YR to 10YR; dry or moist
Value: 4 or 5 dry; 3 or 4 moist
Chroma: 3 to 6 dry; 2 to 4 moist
Texture: clay loam, clay
Clay content: 30 to 45 percent
Rock fragments: 0 to 20 percent-0 to 10 percent gravel, 0 to 10 percent cobbles
Calcium carbonate equivalent: 0 to 15 percent
Reaction: pH 7.6 to 8.2

C horizons
Hue: 10R, 5YR or 5Y; dry or moist
Value: 5 to 8 dry; 4 to 7 moist
Chroma: 2 to 4 dry; 1 to 3 moist
Texture: clay, clay loam
Clay content: 35 to 50 percent
Calcium carbonate equivalent: 5 to 15 percent
Reaction: pH 8.0 to 8.4

COMPETING SERIES:
Nobe (MT) - has horizons with SARs greater than 13
Orinoco (MT) - are moderately deep to paralithic contact
Sunburst (MT) - has secondary calcium carbonate accumulations
Vanda (MT) - has horizons with SARs greater than 13

GEOGRAPHIC SETTING:
Landform - hillslopes
Elevation - 2,055 to 2,230 meters
Slope - 8 to 35 percent
Parent material - slope alluvium and colluvium derived from sandstone and shale
Climate - long, cold winters; cool, moist springs; short, cool summers
Mean annual precipitation - 250 to 350 mm with peak periods of precipitation occurring during the spring
Mean annual air temperature - 2.2 to 5.7 degrees C.
Frost-free period - 30 to 80 days

GEOGRAPHICALLY ASSOCIATED SOILS: None listed.

DRAINAGE AND PERMEABILITY: Well drained, Ksat in particle-size control section 0.5 to 3.0 um/sec.

USE AND VEGETATION: Mudduck soils are primarily used for rangeland. The potential native vegetation is juniper, bluegrass, rhizomatous wheatgrass, rabbit brush, Wyoming big sage, prickly pear cactus, and other forbs and grasses.

DISTRIBUTION AND EXTENT: Mudduck soils are of small extent in southwestern Wyoming. MLRAs 34A, 46.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Lincoln County, Wyoming, 2016. Mudduck is a coined phrase.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - 0 to 10 cm (A horizon)
Particle-size control section - 25 to 100 cm (part of C1, C2, part of C3 horizons)

Mudduck soils have a frigid temperature regime and an ustic moisture regime bordering on aridic.

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National Cooperative Soil Survey
U.S.A.