Established Series


The Newville series consists of very deep, well drained soils that formed in gravelly alluvium from sedimentary and metamorphic rocks. Newville soils are on dissected fan remnants. Slopes range from 3 to 65 percent. The mean annual temperature is 60 to 63 degrees F. (15 to 17 degrees C.) and mean annual precipitation from 15 to 25 inches (381 to 635 millimeters).

TAXONOMIC CLASS: Fine, smectitic, thermic Mollic Palexeralfs

TYPICAL PEDON: Newville gravelly loam - annual grass range. (Colors are for dry soil unless otherwise stated).

A1--0 to 2 inches (0 to 5 centimeters); grayish brown (10YR 5/2) gravelly loam, very dark grayish brown (10YR 3/2) moist; weak medium platy structure; soft, very friable, nonsticky, nonplastic; many fine roots; many very fine pores; slightly acid (pH 6.4); abrupt smooth boundary. (1/4 to 2 inches thick).

A2--2 to 7 inches (5 to 18 centimeters); brown (10YR 5/3) gravelly loam, dark brown (10YR 3/3) moist; massive; hard, friable, slightly sticky, slightly plastic; many fine and medium roots; many fine pores; slightly acid (pH 6.2); clear wavy boundary (4 to 6 inches thick).

A3--7 to 15 inches (18 to 38 centimeters); brown (10YR 5/3) gravelly loam; dark brown (10YR 3/3) moist; massive; hard, friable, slightly sticky and nonplastic; many very fine and fine roots; many fine and medium tubular pores; few thin clay films in pores; moderately acid (pH 6.0); abrupt wavy boundary. (3 to 10 inches thick).

Bt1--15 to 26 inches (38 to 66 centimeters); brown (7.5YR 5/4) gravelly clay, brown (7.5YR 4/3) moist; moderate and strong coarse prismatic structure; very hard, very firm, plastic and sticky, few large roots, many fine and very fine interstitial pores; continuous thick clay films in pores and on ped faces; moderately acid (pH 6.0) gradual wavy boundary (4 to 15 inches thick).

Bt2--26 to 60 inches (66 to 152 centimeters); mixed light yellowish brown (10YR 6/4) and brown (7.5YR 5/4) stratified very gravelly sandy clay and clay, yellowish brown (10YR 5/4) and reddish brown (5YR 4/4) moist; massive, very hard, very firm, sticky and plastic; very few large roots; many very fine interstitial pores; many thick clay films in bridges between mineral grains; slightly acid (pH 6.3)

TYPE LOCATION: Glenn County, California; NW 1/4 of Sec. 18, T.22N., R.4W., 9 miles west Orland. 122 degrees 21 minutes 28.5 seconds west, 39 degrees 45 minutes 58 seconds north, NAD83.

RANGE IN CHARACTERISTICS: The thickness of the solum is 35 to 60 inches. The mean annual soil temperature is about 62 to 65 degrees F. and usually is not below 47 degrees F. at any time. The soil between depths of 4 to 12 inches is usually dry all of the time from May until late October or early November and is moist in some or all parts all the rest of the year. Rock fragments range from 15 to 35 percent by volume in the A and Bt1 horizons to over 50 percent in the Bt2 horizon. Soil reaction is slightly acid to neutral in the A and Bt1 horizons and slightly acid to mildly alkaline in underlying horizons.

The A horizon is dark grayish brown, grayish brown and yellowish brown with hues of 10YR and 7.5YR. Moist color values are 3. The upper 1/2 to 2 inches has weak platy structure and the rest of the horizon is massive and hard when dry. The texture is gravelly loam, gravelly sandy loam and gravelly clay loam.

The Bt1 horizon is yellowish brown, brown and strong brown with hues of 10YR and 7.5YR. The texture is gravelly clay and sandy clay.

The Bt2 horizon has mixed yellowish brown, brown and reddish brown colors. The sediments are stratified and the texture includes very gravelly or cobbly clay, gravelly clay or sandy clay loam.

COMPETING SERIES: These are the Corning, Hillgate, Kimball, Milpitas, Positas, and Tierra series. Corning and Hillgate soils have moist values of 4 or more in the A horizon and Corning soils are medium or strongly acid in their Bt horizons. Kimball soils have hues of 5YR in the upper part of the B2t horizon. Milpitas, Positas and Tierra soils have A2 horizons. Tierra soils have B2t horizons that are dark grayish brown or very dark grayish brown in the upper part.

GEOGRAPHIC SETTING: Newville soils are on rolling to steep dissected fan remnants at elevations of 300 to 2,000 feet. Slopes are 3 to 65 percent. They formed in gravelly alluvium from sedimentary and metamorphic rocks. The climate is subhumid mesothermal with warm dry summers and moist cool winters. Mean annual precipitation is 15 to 25 inches. Average January temperature is 42 to 44 degrees F.; average July temperature is 70 to 75 degrees F.; mean annual temperature is 60 to 63 degrees F. The frost-free season is 250 to 280 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Corning and the Dibble and Millsap soils. Dibble and Millsap soils are underlain by siltstone and sandstone at depths of less than 40 inches.

DRAINAGE AND PERMEABILITY: Well drained; medium to rapid runoff; slow permeability.

USE AND VEGETATION: Grazing and some dry farmed grain. The vegetation is annual grasses, forbs, blue oak and scattered shrubs.

DISTRIBUTION AND EXTENT: Dissected fan remnants on the west side of Sacramento Valley, California. The soils are moderately extensive.


SERIES ESTABLISHED: Glenn County, California, 1957. The name is from the town of Newville, California.

REMARKS: The Newville series would have been classified in the Noncalcic Brown group.

OSED scanned by SSQA. Last revised by state on 1/74.
Fixed depths on Bt3 horizon, updated horizonation, rewrote opening paragraph added slope range, updated parent material. (11-2004; KP)

Edits made after SDJR project - AEC

National Cooperative Soil Survey