LOCATION GILLULY                 UT

Established Series
Rev. LDS/CW/JWB
04/2011

GILLULY SERIES

The Gilluly series consists of moderately deep, well drained soils that formed in colluvium, eolian and/or slope alluvium over residuum derived from interbedded sedimentary rocks. Gilluly soils are on mountain slopes. Slopes range from 8 to 45 percent. Mean annual precipitation is about 74 cm and the mean annual temperature is about 3 degrees C.

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

TYPICAL PEDON: Gilluly loam, on a north facing, convex, 14 percent slope in Douglas fir at an elevation of 2,579 meters. (Colors are for dry soil unless otherwise noted.) The surface is covered by 1 percent cobbles, 2 percent channers and 5 percent gravel.

Oi--0 to 2 cm; slightly decomposed aspen leaves and fir needles; abrupt smooth boundary. (0 to 2 cm thick)

A--2 to 13 cm; dark grayish brown (10YR 4/2) loam, very dark brown (10YR 2/2) moist; moderate fine granular structure; very friable, soft, slightly sticky, slightly plastic; common coarse, medium, fine and very fine roots; common very fine tubular and many very fine interstitial pores; 1 percent cobbles, 2 percent channers, 3 percent gravel; noneffervescent; neutral (pH 7.2); clear wavy boundary. (10 to 23 cm thick)

Bt1--13 to 31 cm; brown (10YR 4/3) clay loam, very dark grayish brown (10YR 3/2) moist; moderate medium and fine subangular blocky structure; friable, slightly hard, moderately sticky, moderately plastic; common coarse, medium, fine and very fine roots; few medium, fine and common very fine tubular pores; common thin distinct dark brown (7.5YR 3/3), dry, clay films on all faces of peds and on surfaces along pores; 1 percent cobbles, 2 percent channers, 3 percent gravel; noneffervescent; neutral (pH 7.3); clear wavy boundary.

Bt2--31 to 46 cm; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 4/4) moist; moderate medium and fine angular blocky structure; friable, hard, moderately sticky, moderately plastic; common coarse, medium, fine and very fine roots; few fine and common very fine tubular pores; many moderately thick prominent brown (7.5YR 4/4), dry, clay films on all faces of peds and on surfaces along pores; 1 percent cobbles, 2 percent channers and 10 percent gravel; noneffervescent; slightly alkaline (pH 7.4); clear wavy boundary. (combined thickness of the Bt horizons is 20 to 33 cm)

Btk--46 to 62 cm; light yellowish brown (10YR 6/4) cobbly clay loam, dark yellowish brown (10YR 4/4) moist; strong medium and fine subangular blocky structure; friable, slightly hard, moderately sticky, moderately plastic; common coarse, medium, very fine and few fine roots; few fine and common very fine tubular pores; common thin prominent brown (7.5YR 5/4), dry, clay films on surfaces along pores and on all faces of peds; 15 percent cobbles, 3 percent channers, 2 percent gravel; slightly effervescent, common fine distinct threadlike very pale brown (10YR 8/2), dry, carbonate masses throughout, common distinct very pale brown (10YR 8/2), dry, carbonate coats on bottom surfaces of rock fragments; slightly alkaline (pH 7.7); abrupt irregular boundary. (7 to 38 cm thick)

Bk--62 to 73 cm; very pale brown (10YR 7/3) extremely cobbly clay loam, pale brown (10YR 6/3) moist; weak medium and fine subangular blocky structure; very friable, slightly hard, moderately sticky, moderately plastic; few medium, fine common very fine roots; common very fine tubular pores; 10 percent flagstones, 40 percent cobbles, 10 percent channers, 5 percent gravel; violently effervescent, common distinct very pale brown (10YR 8/2), dry, carbonate coats on bottom surfaces of rock fragments; common fine distinct threadlike very pale brown (10YR 8/2), dry, carbonate masses throughout; moderately alkaline (pH 8.2); abrupt smooth boundary. (0 to 18 cm thick)

R--73 to 83 cm; interbedded limestone, calcareous sandstone, and calcareous shale bedrock.

TYPE LOCATION: Utah County, Utah; about 3.2 kilometers (2 miles) southwest of Soldier Summit; located about 1,600 feet east and 2,000 feet south of the northwest corner of sec. 35, T. 10 S., R. 7 E.; Soldier Summit USGS quad; lat. 39 degrees 54 minutes 34.6 seconds N. and long. 111 degrees 6 minutes 22.4 seconds W., NAD 83.

RANGE IN CHARACTERISTICS:
Soil moisture: The soil moisture control section is affected by peak periods of precipitation from December to March and July to October; udic bordering ustic moisture regime.
Mean annual soil temperature: 2.2 to 6.7 degrees C
Mean summer soil temperature: 12.2 to 14.4 degrees C
Depth to lithic contact: 51 to 102 cm
Depth to argillic horizon: 10 to 26 cm
Depth to secondary calcium carbonate: 36 to 87 cm
Thickness of the mollic epipedon: 23 to 39 cm

Particle-size control section (weighted averages):
Clay content: 27 to 35 percent
Fine sand and coarser sand content: 20 to 35 percent
Rock fragment content: 0 to 15 percent, mainly gravel and channers

A horizon:
Hue: 10YR
Value: 4 or 5 dry and 2 or 3 moist
Chroma: 2 or 3 dry and moist
Texture: loam
Clay content: 18 to 27 percent
Rock fragments: 0 to 15 percent, mainly gravel and channers
EC (mmhos/cm): 0 to 2
Reaction: neutral to slightly alkaline

Bt horizons:
Hue: 10YR or 2.5Y
Value: 4 to 6 dry and 3 or 4 moist
Chroma: 2 to 4 dry and moist
Texture: clay loam
Clay content: 27 to 40 percent
Rock fragments: 0 to 15 percent, mainly gravel, channers and cobbles
EC (mmhos/cm): 0 to 2
Reaction: neutral to moderately alkaline

Btk horizon:
Hue: 10YR or 2.5Y
Value: 4 to 6 dry and 4 moist
Chroma: 3 or 4 dry and moist
Texture: cobbly clay loam
Clay content: 27 to 35 percent
Rock fragments: 15 to 35 percent gravel, channers and cobbles
Calcium carbonate equivalent: 1 to 15 percent
EC (mmhos/cm): 0 to 4
Reaction: slightly alkaline or moderately alkaline

Bk horizon: when present
Hue: 10YR or 2.5Y
Value: 6 or 7 dry and 4 or 5 moist
Chroma: 2 to 4 dry and moist
Texture: extremely cobbly clay loam
Clay content: 27 to 35 percent
Rock fragments: 60 to 80 percent gravel, channers, cobbles and flagstones
Calcium carbonate equivalent: 5 to 35 percent; when the calcic horizon is greater than 15 cm., the CCE is less than 15 percent; when the CCE is greater than 15 percent, the thickness of the calcic horizon is less than 15 cm.
EC (mmhos/cm): 0 to 4
Reaction: moderately alkaline

COMPETING SERIES: These are the Hourglass, Mult, Quietus, Sponsor, Swede and Wildcow series. These soils do not have a Bk horizon. In addition, the Hourglass, Sponsor, Swede and Wildcow soils are very deep.

GEOGRAPHIC SETTING:
Parent material: colluvium, eolian deposits and/or slope alluvium over residuum derived from sedimentary rock, mainly limestone and calcareous sandstone and shale.
Landform: Mountain slopes
Slopes: 8 to 45 percent
Elevation: 2,316 to 2,926 meters
Mean annual temperature: 1.1 to 5.6 degrees C
Mean annual precipitation: 56 to 92 cm
Precipitation pattern: peaks from December to March and July to October and falls evenly throughout the remainder of the year
Frost-free period: 40 to 70 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Aagard, Helper, Starley and Tosca series. The Aagard soils are very deep, have a calcic horizon and are on mountainsides under aspen. Helper soils are moderately deep, do not have an argillic horizon and are under salina wildrye and mountain big sagebrush on south aspects. Tosca soils are have a typic ustic moisture regime, are loamy-skeletal and deep to a lithic contact and are under scattered Douglas-fir on south aspects. The Starley soils are shallow and loamy-skeletal and are on mountainsides under mountain big sagebrush.

DRAINAGE AND PERMEABILITY: well drained, high runoff, slow permeability.

USE AND VEGETATION: Used for rangeland, timber and wildlife habitat. Native vegetation includes Douglas-fir, quaking aspen, Rocky Mountain juniper, mountain big sagebrush, and intermediate, bluebunch and slender wheatgrasses.

DISTRIBUTION AND EXTENT: North central Utah; LRR E, MLRA 47; small extent (1,155 acres in Duchesne, Utah and Emery Counties, Utah).

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

SERIES ESTABLISHED: Utah County, Utah, Duchesne Area, Utah, Parts of Duchesne, Utah and Wasatch Counties soil survey area, 2011. Named for Gilluly Loop, a serpentine RR track near the type location, where you can view a train moving away and moving toward you at the same time.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Series control section: The zone from 0 to 83 cm.
Particle-size control section: The zone from 13 to 62 cm. (Bt and Btk horizons)
Mollic epipedon: The zone from 0 to 31 cm. (A and Bt1 horizons)
Argillic horizon: The zone from 13 to 62 cm. (Bt and Btk horizons)
Secondary carbonate accumulations: in the zone from 46 to 73 cm (Btk and Bk horizons)
Lithic contact: The contact with interbedded limestone, sandstone and shale at 73 cm. (R horizon)

The Btk and Bk horizon do not qualify as a calcic horizon due either to insufficient thickness or carbonate equivalent.

The assignment of the cation-exchange activity class is inferred from lab data from similar soils in the surrounding area.

Taxonomic Version: Classified according to Keys to Soil Taxonomy, Eleventh Edition, 2010.

---

National Cooperative Soil Survey
U.S.A.