LOCATION DUSATCH UT

Tentative Series
KAB/SJJ
12/2022

DUSATCH SERIES

The Dusatch series consists of deep, well drained soils that formed in slope alluvium or colluvium derived from sedimentary rock. Dusatch soils are in low, concave or sheltered areas on mountain flanks and mountain slopes. Slopes range from 8 to 50 percent. Mean annual precipitation is about 460 mm (18 inches) and the mean annual temperature is about 4.5 degrees C (40 degrees F). These soils receive additional moisture from run-in and drifting snow.

TAXONOMIC CLASS: Fine-loamy, mixed, superactive Pachic Argicryolls

TYPICAL PEDON: Dusatch loam on a south facing aspect with 20 percent slope. (Colors are for dry soil unless otherwise noted.)

A--0 to 36 cm; dark brown (7.5YR 3/2) loam, black (7.5YR 2.5/1) moist; weak medium subangular blocky structure that parts to moderate fine and very fine granular; soft, very friable, slightly sticky and nonplastic; many very fine and few fine, medium and coarse roots; many very fine and common fine pores; 5 percent gravel and 5 percent flagstones; slightly alkaline (pH 7.6); clear wavy boundary. (18 to 36 cm thick)

BAt--36 to 56 cm; dark brown (7.5YR 3/3) loam, very dark brown (7.5YR 2.5/2) moist; moderate medium subangular blocky structure that parts to moderate fine and very fine granular; slightly hard, friable, slightly sticky and slightly plastic; many very fine and few fine, medium and coarse roots; many very fine and few fine pores; 5 percent gravel and 5 percent flagstones; few thin patchy clay films on faces of peds; slightly alkaline (pH 7.6); clear wavy boundary. (20 to 33 cm thick)

Btk1--56 to 79 cm; brown (7.5YR 4/3) flaggy loam, dark brown (7.5YR 3/3) moist; moderate medium subangular blocky structure that parts to moderate fine and very fine granular; hard, friable, slightly sticky and slightly plastic; common very fine and few fine and medium roots; common very fine pores; 5 percent gravel and 20 percent flagstones; few continuous fine clay films on faces of peds; few fine soft irregular calcium carbonate masses in the matrix and few thin (1-2mm thick) calcium carbonate coats on the bottom of rock fragments; slightly effervescent, slightly alkaline (pH 7.6), gradual wavy boundary.

Btk2--79 to 104 cm; brown (7.5YR 5/3) flaggy loam, brown (7.5YR 4/3) moist; weak fine and medium subangular blocky structure; hard, friable, slightly sticky and slightly plastic; few very fine roots; few very fine pores; 5 percent gravel and 20 percent flagstones; few continuous fine clay films on faces of peds; few fine soft irregular calcium carbonate masses in the matrix and few thin (1-2mm thick) calcium carbonate coats on the bottom of rock fragments; strongly effervescent, moderately alkaline (pH 8.0); gradual wavy boundary. (Btk horizons 48 to 61 cm thick)

Cr--104 cm; interbedded soft fractured shale and fine-grained sandstone bedrock.

TYPE LOCATION: Wasatch County, Utah; about 12 kilometers (7.5 miles) northwest of Hanna; about 430 meters east and 390 meters north of the southwest corner of sec. 21, T. 1 N., R. 9 W.; latitude 40 degrees 27 minutes 49.68 seconds north and longitude 110 degrees 55 minutes 00.55 seconds west, NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: Udic moisture regime. These soils receive additional moisture from run-in and drifting snow.
Mean annual soil temperature: 4.5 to 6.5 degrees C (40 to 44 degrees F)
Thickness of the mollic epipedon: 70 to 82 cm (28 to 32 inches)
Depth to argillic horizon: 18 to 36 cm (7 to 14 inches)
Thickness of the argillic horizon: 49 to 97 cm (19 to 38 inches)
Depth to secondary carbonate accumulation: 51 to 56 cm (20 to 22 inches)
Depth to paralithic contact: 100 to 150 cm.

Particle-size control section (weighted averages):
Clay content: 18 to 26 percent
Rock fragment content: 5 to 25 percent

A horizon:
Hue: 5YR or 7.5YR
Value: 2 or 3 dry, 2 or 3 moist
Chroma: 1 or 2 dry or moist
Texture: Loam
Texture modifiers: Gravelly or flaggy, when fragments exceed 14 percent
Clay content: 13 to 18 percent
Rock fragment content: 0 to 20 percent gravel and flagstones
Reaction: Slightly alkaline (pH 7.4 to 7.8)

BAt or ABt horizon:
Hue: 5YR or 7.5YR
Value: 2 to 4 dry, 2 or 3 moist
Chroma: 2 or 3 dry or moist
Texture: Loam
Texture modifiers: Gravelly or flaggy, when fragments exceed 14 percent
Clay content: 14 to 20 percent
Rock fragment content: 0 to 20 percent gravel and flagstones
Reaction: Slightly alkaline (pH 7.4 to 7.8)

Btk horizon(s):
Hue: 5YR or 7.5YR
Value: 4 or 5 dry, 3 or 4 moist
Chroma: 3 dry or moist
Texture: Loam
Texture modifier: Gravelly or flaggy, when fragments exceed 14 percent
Clay content: 18 to 26
Rock fragment content: 10 to 34 percent, gravel, channers and flagstones
Calcium carbonate equivalent: 5 to 14 percent
Reaction: Slightly to strongly effervescent, slightly alkaline or moderately alkaline (pH 7.4 to 8.4)

In some pedons, a BCk horizon is present below the Btk horizon(s).

COMPETING SERIES: These following (32) series have the same classification as Dusatch but differ in the described way:

Bachus (WY) - have a lithic contact at depths of 50 to 100 cm
Badvark (MT) - does not have secondary calcium carbonate accumulation
Benteen (MT+CO) - have a lithic contact at depths of 50 to 100 cm
Brushtop (ID) - have a paralithic contact at depths of 50 to 100 cm; have a xeric moisture regime
Clayburn (UT) - does not have a paralithic contact within 150 cm
Clayman (CO) - does not have a paralithic contact within 150 cm
Crystalbutte (ID) - have a lithologic discontinuity; have a xeric moisture regime
Davtone (CO) - does not have a paralithic contact within 150 cm
Dehana (ID) - have a lithologic discontinuity
Demast (ID) - have a lithic contact at depths of 100 to 150 cm
Dranburn (ID) - does not have secondary calcium carbonate accumulation
Dranyon (ID) - does not have secondary calcium carbonate accumulation
Echemoor (WY) - have a paralithic contact at depths of 50 to 100 cm
Fontback (WY) - does not have a paralithic contact within 150 cm
Goyer (WY) - does not have a paralithic contact within 150 cm
Hagenbarth (ID) - have a xeric moisture regime
Hoopgobel (ID) - have a paralithic contact at depths of 50 to 100 cm
Laplan (UT) - does not have secondary calcium carbonate accumulation
Longway (ID) - have a lithologic discontinuity; have a xeric moisture regime
Lostminer (UT) - have a lithic contact at depths of 50 to 100 cm
Millerlake (WY) - does not have a paralithic contact within 150 cm
Odark (MT) - does not have a paralithic contact within 150 cm
Rabbitears (CO) - does not have secondary calcium carbonate accumulation
Senchert (UT) - have a lithic contact at depths of 50 to 100 cm
Silverjack (CO) - does not have a paralithic contact within 150 cm
Southmount (ID) - have a lithologic discontinuity
Poodle (NV) - have a paralithic contact at depths of 50 to 100 cm
Stockmore (UT) - does not have a paralithic contact within 150 cm
Stubbs (WY) - have a paralithic contact at depths of 50 to 100 cm
Thulepah (NV) - have a lithologic discontinuity
Vadnais (ID) - have a lithic contact at depths of 50 to 100 cm
Winu (NV) - have a lithic contact at depths of 50 to 100 cm

GEOGRAPHIC SETTING:
Parent material: Slope alluvium or colluvium derived from sedimentary rock
Landform: Low, concave or sheltered areas on mountain flanks or mountain slopes
Slopes: 8 to 50 percent
Elevation: 2,230 to 3,050 meters (7,310 to 10,000 feet)
Mean annual temperature: 3.5 to 5.5 degrees C (38 to 42 degrees F)
Mean annual precipitation: 410 to 500 mm (16 to 20 inches)
Relative effective annual precipitation (REAP): 610 to 710 mm (24 to 28 inches)
Frost-free period: 50 to 70 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Zillion and Tyzak series. The Zillion soils have more than 35 percent rock fragments in the particle size control section and are on mountain slopes. The Tyzak soils have lithic contact within 50 cm of the soil surface and are on windswept ridges.

DRAINAGE AND PERMEABILITY: Well drained, low to medium runoff, moderate or moderately rapid permeability.

USE AND VEGETATION: Dusatch soils are typically on forested land with quaking aspen as the dominant tree species, and mountain brome, ross sedge, blue wildrye, birchleaf mountain mahogany, and shrubby cinquefoil as the dominant understory vegetation.

DISTRIBUTION AND EXTENT: Northeastern Utah; Duchesne Area, MLRA 47, LRU 47C; series is of small extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Bozeman, Montana

SERIES PROPOSED: Wasatch County, Utah. Duchesne Area, Utah soil survey area UT013, 2018.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: the zone from 36 to 86 cm (BAt, Btk1 and upper Btk2 horizons).
Mollic epipedon: from 0 to 79 cm (A, BAt, and Btk1 horizons).
Argillic horizon: from 36 to 104 cm (BAt and Btk horizons).
Secondary carbonate accumulation: from 56 to 104 cm (Btk horizons).
(Carbonates do not meet the requirements for a calcic horizon)
Paralithic contact: soft fractured, interbedded sandstone and shale at 104 cm (Cr horizon)

Taxonomic Version: Classified according to Keys to Soil Taxonomy, 12th Edition, 2014.

National Cooperative Soil Survey
U.S.A.