LOCATION MARYSVILLE CAEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, thermic Mollic Haploxeralfs
TYPICAL PEDON: Marysville loam - on a nearly level slope of less than l percent under irrigated prunes at an elevation of 75 feet. (Colors are for dry soil unless otherwise stated. When described on October 10, 1986, the soil was moist throughout.)
Ap--0 to 6 inches; brown (10YR 5/3) loam, dark brown (10YR 3/3) moist; moderate medium subangular blocky structure; slightly hard, friable, slightly sticky and slightly plastic; common very fine roots; common very fine tubular pores; slightly alkaline (pH 7.8); clear smooth boundary. (6 to 8 inches thick)
Bt1--6 to 13 inches; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; hard, friable, sticky and plastic; few very fine roots; common very fine tubular and few fine interstitial pores; common thin clay films on ped faces and lining pores; slightly alkaline (pH 7.8); clear smooth boundary. (4 to 10 inches thick)
Bt2--13 to 23 inches; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; hard, friable, sticky and slightly plastic; few very fine roots; common very fine tubular pores; moderately alkaline (pH 8.0); gradual smooth boundary. (10 to 25 inches thick)
Bt3--23 to 31 inches; yellowish brown (10YR 5/4) clay loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; hard, friable, sticky and slightly plastic; few very fine roots; common very fine tubular pores; many thin clay films on ped faces and lining pores; moderately alkaline (pH 8.0); clear wavy boundary. (5 to 10 inches thick)
Bt4--31 to 36 inches; yellowish brown (10YR 5/4) silty clay loam, dark yellowish brown (10YR 3/4) moist; weak fine subangular blocky structure; hard, friable, sticky and slightly plastic; common very fine tubular pores; many thin clay films on ped faces and lining pores; moderately alkaline (pH 8.0); abrupt wavy boundary. (3 to 8 inches thick)
2Cr--36 inches; light gray (2.5Y 7/2) siltstone, grayish brown (2.5Y 5/2) moist; common very fine tubular pores; common black (10YR 2/1) and strong brown (7.5YR 4/4) stains in fractures and pores; common moderately thick dark yellowish brown (10YR 4/4) clay films lining pores.
TYPE LOCATION: Yuba County, California; about 6.7 miles north of Marysville, 2,700 feet south of the intersection of Highway 70 and Ramirez Road and 200 feet west in orchard in a unsectionized area of the Honcut Rancho; Honcut Quadrangle.
RANGE IN CHARACTERISTICS: Depth to a paralithic contact of siltstone is at 20 to 40 inches. The mean annual soil temperature is 64 to 66 degrees F. The soil temperature is above 47 degrees all year. The 6 to 16 inch moisture control section is dry in all parts from May 15 to October 3 and moist in some part the rest of the year. The control section contains less than 15 percent fine or coarser sands.
The A horizon has dry color of 10YR 5/3 and moist colors of 10YR 3/4 or 3/3. Chromas of 3 are above 6 inches. Clay content ranges from 20 to 27 percent. Reaction is neutral to slightly alkaline.
The Bt horizon has dry colors of 10YR 6/4 or 5/4, and moist colors of 10YR 4/6, 4/4 or 3/4. Clay content ranges from 27 to 35 percent. Reaction is slightly to moderately alkaline.
COMPETING SERIES: These are the Americanos and Zamora series. Americanos soils are greater than 50 inches deep. Zamora soils are greater than 60 inches deep.
GEOGRAPHIC SETTING: Marysville soils are on stream terraces. Slopes range from 0 to 1 percent. The soils formed in alluvium from mixed rock sources. Elevation is 50 to 90 feet. The climate is subhumid with hot, dry summers and cool, moist winters. The average annual precipitation is about 18 to 22 inches. The average January temperature is 46 degrees F; the average July temperature is 79 degrees F the mean annual temperature is 61 to 63 degrees F. The frost-free season is 270 to 290 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Conejo and Kilaga soils. Conejo soils have bedrock at more than 60 inches. Kilaga soils have a duripan at 40 to 60 inches. They are on similar landscape positions.
DRAINAGE AND PERMEABILITY: Well drained; slow runoff, moderately slow permeability. Subject to rare flooding.
USE AND VEGETATION: Used for irrigated orchards, mainly prunes and peaches.
DISTRIBUTION AND EXTENT: Southeastern part of the Sacramento Valley, California. Soils are not extensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Davis, California
SERIES ESTABLISHED: Yuba County, California, 1992.
REMARKS: The Marysville series was originally mapped in the 1909 soil survey of the Marysville area, California. The series was made inactive because the original type location could not be located and because it had not been mapped elsewhere. This revision reestablishes the series, a new type location and redefines the concept of the original series.
The activity class was added to the classification in January of 2003. Competing series were not checked at that time. - ET
Diagnostic horizons recognized in this pedon:
Taxonomic Class: Fine-silty, mixed, thermic Mollic Haploxeralfs.
Major Diagnostic Horizons:
1. Ochric Epipedon - 0 TO 6 inches (Ap) ranges from 6 to 8 inches thick.
1.1 Thickness does not meet requirements for mollic epipedon.
2. Argillic Horizon - (Btl, Bt2, Bt3, Bt4) 6 to 36 inches. Clay content by weighted average for the 6 to 26 inch textural control section is 29 percent.
2.1 PSA by Hydrometer (Local): #140 sieve % FS or
Horizon Depth (in.) % clay % silt % sand coarser Ap
0 - 6 23 47.6 28.4 14.4 Bt1 6 - 13
28 48.6 23.4 7.0 Bt2 13 - 23 30 48.6 21.4 5.8 Bt3 23 - 31 28 49.6 22.4
6.6 Bt4 31 - 36 27 50.6 22.4 6.2
2.2 Clay films present.
Other Diagnostic Horizons or Soil Characteristics:
1. Fine-silty Family:
1.1 Less than 15 percent of the particles by weight are fine sand or coarser. (See data 2.1)
2. Temperature - Moisture Regime (Xeric-thermic):
2.1 The 6 to 16 inch SMCS is dry in all parts from May 15 to October 31 and is moist in all parts from November 15 to May 1.
2.2 The soil temperature is above 47 degrees F.
f.r the entire year.
2.3 The MAST is 64 to 66 degrees F.