LOCATION INVILLE NV+CA

Established Series
REV: LIL/ELS/WRL/ET
01/2023

INVILLE SERIES

The Inville series consists of very deep, well drained soils that formed in mixed alluvium and glacial outwash. Inville soils are on alluvial fans and outwash terraces. Slopes are 2 to 30 percent. The mean annual precipitation is about 635 mm and the mean annual temperature is about 6 degrees C.

TAXONOMIC CLASS: Loamy-skeletal, isotic, frigid Ultic Haploxeralfs

TYPICAL PEDON: Inville stony coarse sandy loam, forested. (Colors are for dry soil unless otherwise noted.)

Oi--0 to 5 cm; litter of conifer needles.

A1--5 to 8 cm; brown (10YR 4/3) gravelly coarse sandy loam, very dark brown (10YR 2/2) moist; moderate fine and medium granular structure; soft, very friable, nonsticky and nonplastic; few very fine roots; many very fine interstitial pores; 20 percent gravel; moderately acid (pH 6.0); abrupt smooth boundary. (3 to 10 cm thick)

A2--8 to 15 cm; brown (10YR 5/3) gravelly coarse sandy loam, dark brown (10YR 3/3) moist; weak medium subangular blocky and moderate fine granular structure; soft, very friable, nonsticky and nonplastic; common very fine, fine, and medium roots; many very fine interstitial and few very fine tubular pores; 20 percent gravel; moderately acid (pH 6.0); clear smooth boundary. (8 to 13 thick)

Bw--15 to 30 cm; brown (10YR 5/3) gravelly coarse sandy loam, variegated dark brown (10YR 3/3) and dark yellowish brown (10YR 3/4) about equal amounts of each) moist; weak medium subangular blocky structure; soft, very friable, nonsticky and nonplastic; many very fine, fine, medium and coarse roots; many fine interstitial and common very fine tubular pores; few thin clay films in pores; 20 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (10 to 20 cm thick)

Bt1--30 to 71 cm; reddish brown (5YR 5/3) extremely cobbly sandy loam, reddish brown (5YR 4/3) moist; weak medium subangular blocky structure; hard, very friable, slightly sticky and slightly plastic; many very fine, fine, medium and coarse roots; many very fine interstitial and common very fine tubular pores; common thin clay films in pores and few thin on faces of peds; 25 percent cobbles and 35 percent gravel; moderately acid (pH 6.0); clear wavy boundary. (25 to 51 cm thick)

Bt2--71 to 94 cm; brown (10YR 5/3) extremely cobbly sandy loam, brown (10YR 4/3) moist; dark yellowish brown (10YR 4/4) clay coats moist; weak medium and coarse subangular blocky structure; slightly hard, very friable, nonsticky and nonplastic; few very fine and fine, and common medium roots; many very fine interstitial and few very fine tubular pores; few thin clay films coating and bridging sand grains; 35 percent gravel and 35 percent cobbles; moderately acid (pH 6.0); clear wavy boundary. (23 to 46 cm thick)

C1--94 to 142 cm; brown (10YR 5/3) dry and moist, extremely gravelly loamy coarse sand; massive; soft, very friable, nonsticky and nonplastic; few very fine, fine and medium roots; many fine and medium interstitial pores; 25 percent cobbles and 50 percent gravel; moderately acid (pH 6.0).

TYPE LOCATION: Washoe County, Nevada; in Incline Village, approximately 671 meters east and 671 meters south of the northwest corner of section 15, T. 16 N., R. 18 E., Mount Diablo base line and meridian.

RANGE IN CHARACTERISTICS:

Soil moisture - Usually moist, dry in summer and early fall.

Soil temperature - 6 to 8 degrees C., mean summer soil temperature 15 to 18 degrees C.

Reaction - Moderately acid to slightly acid

Control section - Rock fragments: 45 to 75 percent

A horizon
Value: 4 or 5 dry, 2 or 3 moist.
Chroma: 2 or 3.

Bt horizon
Hue: 7.5YR or 5YR - 10YR in lower part.
Value: 4, 5 or 6 dry, 3 or 4 moist.
Chroma: 3 or 4 matrix, 4 to 6 faces
Texture: Sandy loam, coarse sandy loam or loam modified by rock fragments.

COMPETING SERIES: There are not other series in this family at this time.

GEOGRAPHIC SETTING: Inville soils occur on gently sloping to moderately steep alluvial fans and outwash terraces. These soils formed in alluvium and glacial outwash from mixed parent rocks consisting of volcanics and granitics but dominantly from andesite. Slopes are 2 to 30 percent. Elevations are 1525 to 2275 meters. Mean annual precipitation is 480 to 990 mm, most of which comes as winter snow. The mean annual temperature is 5 to 8 degrees C., mean January temperature is -3 to -1 degrees F., and the mean July temperature is 15 to 17 degrees C.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Cagwin and Jorge soils. Cagwin soils are from granitic parent material and do not have Bt horizons. Also, they are underlain by decomposed granite and have less than 35 percent rock fragments in their control sections. Jorge soils have andic subgroup properties.

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

USE AND VEGETATION: Used mainly for urban development. The principal native plants are Jeffrey pine and white fir with underbrush of manzanita and ceanothus.

DISTRIBUTION AND EXTENT: In Lake Tahoe Basin of Nevada and California and possibly other high elevation basins. These soils are are not extensive. MLRA 22A

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

SERIES ESTABLISHED: Tahoe Basin Area, California and Nevada, 1970.

REMARKS:
Particle size control section - The zone from 30 to 80 cm.

Diagnostic horizons and features recognized in this pedon are:
Umbric epipedon - The zone from 5 to 30 cm.
Argillic horizon - The zone from 30 to 94 cm.
Ultic subgroup feature - The zone from 30 to 94 cm.

National Cooperative Soil Survey
U.S.A.