LOCATION NUMANA                  NV UT

Established Series
Rev. SCH/JVC/JBF
12/2019

NUMANA SERIES

The Numana series consists of very deep, moderately well drained soils that formed in alluvium derived from mixed igneous and sedimentary rocks. Numana soils are on flood plain steps and point bars of flood plains. Slopes are 0 to 4 percent. The mean annual precipitation is about 125 mm and the mean annual temperature is about 12 degrees C.

TAXONOMIC CLASS: Sandy-skeletal, mixed, mesic Oxyaquic Torrifluvents

TYPICAL PEDON: Numana extremely gravelly loamy sand--wildlife habitat. (Colors are for dry soil unless otherwise noted.)

A1--0 to 8 cm; grayish brown (10YR 5/2) extremely gravelly loamy sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; many very fine and fine roots; many fine and medium interstitial pores; 50 percent gravel and 15 percent cobbles; neutral (pH 7.2); abrupt smooth boundary. (2 to 12 cm thick)

A2--8 to 20 cm; grayish brown (10YR 5/2) very gravelly sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; common very fine and fine roots; many fine and medium interstitial pores; 40 percent gravel and 10 percent cobbles; neutral (pH 7.0); clear wavy boundary. (0 to 20 cm thick)

C1--20 to 53 cm; grayish brown (10YR 5/2) very gravelly coarse sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; common fine and medium interstitial pores; 40 percent gravel and 5 percent cobbles; neutral (pH 7.2); clear wavy boundary. (20 to 50 cm thick)

C2--53 to 152 cm; grayish brown (10YR 5/2) stratified gravelly loamy sand and very gravelly coarse sand, dark grayish brown (10YR 4/2) moist; single grain; loose, nonsticky and nonplastic; common fine and medium interstitial pores; averages 40 percent gravel; neutral (pH 7.2).

TYPE LOCATION: Washoe County, Nevada; on the Pyramid Lake Indian Reservation about 2 miles northwest of the S Bar S Ranch along the Truckee River; about 140 feet south and 1740 feet west of the northeast corner, section 8, T. 2 N, R 24 E.; USGS Wadsworth 7.5 minute quadrangle; latitude 39 degrees 42 minutes 33.7 seconds N and longitude 119 degrees 18 minutes 30.2 seconds W; UTM 11, 4398047n, 302113e; WGS84 Decimal Degrees 39.7093611 latitude, -119.3083889 longitude.

RANGE IN CHARACTERISTICS:
Soil moisture: Usually dry; moist in winter and spring, dry in summer and fall. The soil is saturated at depths from 90 to 150 cm for up to 30 cumulative days between February and August in normal years. Aridic (torric) soil moisture regime with oxyaquic conditions below the moisture control section.
Mean annual soil temperature: 9.0 to 13 degrees C.
Reaction: Neutral or slightly alkaline.
Organic matter: 0 to 3 percent; decreases irregularly with depth.
Calcium carbonate equivalent: 0 to 1 percent.

Particle-size control section - Clay content: Averages 0 to 5 percent.
Rock fragments: Averages 35 to 70 percent. Lithology of fragments are igneous rocks such as andesite, basalt, and granodiorite.

A horizons
Hue: 10YR or 2.5Y.
Value: 5 to 7 dry, 4 or 5 moist.
Chroma: 2 or 3 moist.

C horizons
Value: 5 to 7 dry, 4 or 5.
Chroma: 1 to 3, dry or moist.
Texture: Gravelly loamy sand to extremely cobbly coarse sand. Subhorizons of sand or loamy fine sand are in some pedons.
Rock fragments: Averages 35 to 70 percent, mainly gravel and cobbles.

COMPETING SERIES: This is the Anvil series. Anvil soils have disseminated calcium carbonate throughout the profile and moderately alkaline reaction throughout with a mean annual soil temperature of 8 to 10.5 degrees C.

GEOGRAPHIC SETTING: Numana soils are on flood plain steps and point bars of flood plains. These soils formed in alluvium derived from mixed igneous and sedimentary rocks. Slopes are 0 to 4 percent. Elevations range from 1,150 to 2,265 meters. The climate is semiarid with cool, moist winters and warm, dry summers. The mean annual precipitation is 100 to 300 mm, the mean annual temperature is 8.0 to 13 degrees C., and the frost-free period is 100 to 140 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Carwalker and Dia soils.

Carwalker soils have a sandy particle-size class. Dia soils are fine-loamy and have a mollic epipedon.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY: Moderately well drained; negligible surface runoff; very high saturated hydraulic conductivity. Endosaturation is present with an apparent seasonal high water table between 90 and 150 cm (deep and very deep free water occurrence classes) from February through August. These soils are susceptible to frequent or occasional flooding during high runoff events.

USE AND VEGETATION: Numana soils are used for wildlife habitat. The vegetation is rubber rabbitbrush, basin big sagebrush, blazing star, and scattered stands of willow and Fremont cottonwood.

DISTRIBUTION AND EXTENT: Western Nevada. These soils are not extensive. MLRA 27, 28A.

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

SERIES ESTABLISHED: Washoe County, Nevada, (established during update of NV603 Fallon-Fernley Area, NV), 1/2009.

REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - The zone from the soil surface to 18 cm (A1 and part of the A2 horizons).
Endosaturation feature - The condition of ground water with an upper boundary between 99 and 150 cm at certain times in normal years (part of C2 horizon).
Particle-size control section - The zone from 25 to 100 cm (parts of the C1 and C2 horizons).

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National Cooperative Soil Survey
U.S.A.