LOCATION EASTGATE                NV

Established Series
Rev: TM/JBF/WED
05/2016

EASTGATE SERIES

The Eastgate series consists of very deep, well drained soils that formed in alluvium derived from mixed rocks and aeolian deposits on alluvial fans, fan skirts and fan piedmonts often with sand sheets. Slopes are 0 to 8 percent. The mean annual precipitation is about 100 mm and the mean annual temperature is about 12 degrees C.

TAXONOMIC CLASS: Sandy, mixed, mesic Typic Haplocambids

TYPICAL PEDON: Eastgate gravelly loamy sand--rangeland. (Colors are for dry soil unless otherwise noted.)

A1--0 to 5 cm; pale brown (10YR 6/3) gravelly loamy sand, brown (10YR 4/3) moist; moderate thin platy structure; soft, very friable, nonsticky and nonplastic; common very fine roots; many very fine interstitial pores; 20 percent gravel; slightly effervescent; strongly alkaline (pH 8.6); abrupt smooth boundary. (3 to 13 cm thick)

A2--5 to 13 cm; pale brown (10YR 6/3) gravelly loamy sand, brown (10YR 4/3) moist; moderate thin platy structure; slightly hard, very friable, nonsticky and nonplastic; common very fine and few fine roots; many very fine interstitial pores; 15 percent gravel; slightly effervescent; moderately alkaline (pH 8.4); abrupt wavy boundary. (0 to 10 cm thick)

Bw--13 to 43 cm; pale brown (10YR 6/3) gravelly sandy loam, brown (10YR 4/3) moist; moderate medium subangular blocky structure; soft, very friable, slightly sticky and nonplastic; common fine, many very fine and few medium roots; many very fine interstitial pores; 15 percent gravel; strongly effervescent; moderately alkaline (pH 8.3); abrupt wavy boundary. (15 to 36 cm thick)

Bk--43 to 64 cm; light gray (10YR 7/2) gravelly loamy sand, brown (10YR 5/3) moist; massive; hard, very friable, nonsticky and nonplastic; common very fine and fine roots; many very fine and fine interstitial and tubular pores; 15 percent gravel; violently effervescent; strongly alkaline (pH 8.8); abrupt wavy boundary. (13 to 38 cm thick)

2Bk1--64 to 102 cm; pale brown (10YR 6/3) very gravelly loamy sand, brown (10YR 4/3) moist; massive, soft, very friable, nonsticky and nonplastic; many very fine, common fine roots; many very fine and fine interstitial pores; 35 percent gravel; lime pendants on underside of gravel; violently effervescent; very strongly alkaline (pH 9.6); clear wavy boundary. (20 to 76 cm thick)

2Bk2--102 to 137 cm; pale brown (10YR 6/3) very gravelly loamy sand, brown (10YR 4/3) moist; massive; soft, very friable, nonsticky and nonplastic; many very fine and common fine roots; many very fine and fine interstitial pores; 45 percent gravel; lime pendants on underside of gravel; violently effervescent; very strongly alkaline (pH 9.4); abrupt wavy boundary. (13 to 64 cm thick)

2Bk3--137 to 155 cm; very pale brown (10YR 8/2) very gravelly loamy sand, brown (10YR 5/3) moist; massive; slightly hard, firm, nonsticky and nonplastic; few fine and very fine roots; common very fine interstitial pores; 50 percent gravel; weak lime coatings on underside of gravel; violently effervescent; strongly alkaline (pH 8.8). (0 to 25 cm thick)

TYPE LOCATION: Nye County, Nevada; about 700 feet east and 200 feet north of the southwest corner of section 1, T. 12 N., R. 35 E.; latitude 38 degrees 55 minutes 31 seconds N and longitude 117 degrees 59 minutes 47 seconds W; WGS84 Decimal Degrees 38.9267778 latitude, -117.986667 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry, moist in some part for short periods during winter and early spring months, and for 10 to 20 days cumulative between July and October due to convection storms; typic aridic soil moisture regime. Dry in lower part of moisture control section.
Mean annual soil temperature: 12 to 15 degrees C.
Depth to base of Bw horizon; 36 to 50 cm.

Particle-size control section - Rock fragments: 15 to 35 percent gravel (after mixing).

A horizon
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 2 or 3.
Reaction: Moderately alkaline or strongly alkaline.
Effervescence: Slightly effervescent through strongly effervescent (due to carbonate recharge).

Bw horizon
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 2 or 3.
Texture: Sandy loam or gravelly sandy loam.
Clay content: 8 to 15 percent.
Rock fragments: 5 to 20 percent gravel.
Structure: Prismatic or subangular blocky.
Reaction: Moderately alkaline or strongly alkaline.
Effervescent: Noneffervescent through strongly effervescent (due to carbonate
recharge).

Bk horizon
Value: 6 or 7 dry, 4 or 5 moist.
Chroma: 2 or 3.
Texture: Loamy sand or gravelly loamy sand.
Rock fragments: 5 to 20 percent gravel.
Consistence: Slightly hard to hard dry.
Reaction: Moderately alkaline or strongly alkaline.
Effervescence: Strongly effervescent or violently effervescent.


2Bk horizon - Value: 6 through 8 dry, 4 or 5 moist.
Chroma: 2 or 3.
Texture: Very gravelly loamy sand with thin strata of very gravelly sandy loam in some pedons.
Consistence: Soft to hard dry, very friable to firm.
Rock fragments: 35 to 50 percent gravel, 0 to 5 percent cobbles.
Reaction: Strongly alkaline or very strongly alkaline. Few to many lime pediments and coats on rock fragments (less than 5 percent by volume).

COMPETING SERIES: This is the Fawin series. Fawin soils have a control section that averages less than 15 percent rock fragments and lack unconformable horizons with over 35 percent rock fragments between depth of 64 and 100 cm.

GEOGRAPHIC SETTING: Eastgate soils are on alluvial fans, fan skirts and fan piedmonts. These soils formed in mixed alluvium derived from andesite and other igneous and sedimentary rocks with a component of aeolian material from mixed rocks. Slopes are 0 to 8 percent. Elevations are 1,213 to 1,890 meters. The mean annual precipitation is about 75 to 150 mm, mean annual temperature is about 10 to 12 degrees C, and the frost-free season is about 110 to 140 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Hawsley and Izo soils. Hawsley soils lack a cambic horizon. Izo soils lack a cambic horizon and are sandy skeletal.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Well drained; slow runoff; moderately low saturated hydraulic conductivity.

USE AND VEGETATION: Rangeland and wildlife habitat. The vegetation is mainly Bailey greasewood, shadscale, Indian ricegrass, littleleaf horsebrush and winterfat.

DISTRIBUTION AND EXTENT: Central Nevada. The series is of small extent. MLRA 27, 29.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California

SERIES ESTABLISHED: Mineral County, Nevada, 1985.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the surface to 18 cm (A1, A2 and part of the Bw horizons).
Cambic horizon - The zone from about 13 to 43 cm (Bw horizon).
Particle-size control section - The zone from about 25 to 100 cm (Bk and part of the Bw and 2Bk1 horizons).

---

National Cooperative Soil Survey
U.S.A.