LOCATION CONSER OREstablished Series
TAXONOMIC CLASS: Fine, mixed, superactive, mesic Vertic Argiaquolls
TYPICAL PEDON: Conser silty clay loam, native pasture. (Colors are for moist soil unless otherwise noted.)
A--0 to 9 inches; very dark brown (10YR 2/2) silty clay loam, grayish brown (10YR 5/2) dry; strong fine granular structure; hard, friable, moderately sticky and moderately plastic; many very fine and few fine roots; many fine irregular pores; few fine prominent strong brown (7.5YR 5/6) masses of iron accumulation; slightly acid (pH 6.2); clear smooth boundary. (6 to 17 inches thick)
BAg--9 to 14 inches; very dark grayish brown (10YR 3/2) silty clay, grayish brown (10YR 5/2) dry weak medium prismatic and moderate medium subangular blocky structure; hard, firm, very sticky and very plastic; common very fine and fine roots; many very fine and few fine and medium tubular pores; ; common fine prominent strong brown (7.5YR 5/6) masses of iron accumulation; slightly acid (pH 6.2); clear smooth boundary. (0 to 11 inches thick)
Btg--14 to 27 inches; very dark gray (10YR 3/1) clay, grayish brown (10YR 5/2) dry; weak medium prismatic and moderate medium and fine subangular blocky structure; very hard, firm, very sticky and very plastic; common very fine and fine roots; many very fine and few fine and medium tubular pores; common distinct clay films along pores and on faces of peds; common fine prominent strong brown (7.5YR 5/6) masses of iron accumulation; slightly acid (pH 6.4); clear smooth boundary. (11 to 35 inches thick)
BCtg--27 to 41 inches; mottled brown (10YR 4/3), dark grayish brown (10YR 4/2) and strong brown (7.5YR 5/6) silty clay, pale brown (10YR 6/3) and light brownish gray (10YR 6/2) dry; weak coarse subangular blocky structure; very hard, firm, very sticky and very plastic; few very fine roots; many very fine and common fine tubular pores; many distinct very dark gray (10YR 3/1) clay films along pores; slightly acid (pH 6.4); clear wavy boundary. (0 to 20 inches thick)
2Cg1--41 to 49 inches; dark grayish brown (10YR 4/2) loam, light brownish gray (10YR 6/2) dry; massive; hard, friable, slightly sticky, slightly plastic; few very fine roots; common very fine and fine pores; faint very dark gray (10YR 3/1) clay films along some pores; many medium prominent strong brown (7.5YR 4/6) masses of iron accumulation; slightly acid (pH 6.4); clear wavy boundary. (0 to 14 inches thick)
2Cg2--49 to 60 inches; dark grayish brown (10YR 4/2) sandy loam, grayish brown (10YR 5/2) dry; massive; slightly hard, very friable, nonsticky and nonplastic; many medium prominent strong brown (7.5YR 4/6) masses of iron accumulation; neutral (pH 6.8).
TYPE LOCATION: Lane County, Oregon; about 1/2 mile northeast of the community of Irving; about 2,000 feet east and 2,000 feet south of the NW corner of section. 3, T. 17 S., R. 4 W. Willamette Meridian. Eugene West, Oregon USGS 7.5 minute topographic quadrangle. Latitude 44 degrees, 07 minutes, 21 seconds N.; Longitude 123 degrees, 09 minutes, 40 seconds W. NAD 27.
RANGE IN CHARACTERISTICS: The soils are usually moist and are saturated with water during the winter season. Depth to aquic conditions and chroma of 2 or less with or without redox concentrations is 0 to 10 inches. The mean annual soil temperature ranges from 52 to 56 degrees F. The soil is over 60 inches deep. Below 40 inches stratification is common with a wide range in texture. Up to 10 percent gravel occurs throughout the solum in some pedons. The pscs has 35 to 60 percent clay. The mollic epipedon is 24 to 34 inches thick.
The A horizon has value of 2 or 3 moist and 3 to 5 dry, chroma of 1 or 2 moist and dry. It has from none to common distinct to prominent redoximorphic features. It has moderate to strong granular or subangular blocky structure. It is slightly acid or moderately acid.
The AB or BA horizon when present has value of 3 or 4 moist, 4 to 6 dry, and chroma of 1 or 2 moist and dry. It has common prominent redoximorphic features. It has weak prismatic and moderate subangular blocky structure. It is silty clay loam, silty clay or clay with 35 to 50 percent clay. It is slightly acid or moderately acid.
The Bt horizon has hue of 10YR or 2.5Y, value of 3 to 5 moist, 4 to 6 dry, chroma of 1 to 3 moist and dry. It has common to many distinct to prominent redoximorphic features. It has weak or moderate prismatic and moderate or strong subangular of angular blocky structure. It is silty clay loam, silty clay, or clay with 35 to 60 percent clay. It is slightly acid or moderately acid.
The C horizon, when present, has hue of 10YR or 2.5Y, value of 4 or 5 moist, 5 or 6 dry, and chroma of 1 to 4 moist and dry. It has many distinct to prominent redoximorphic features. It is stratified loam, sandy loam, clay loam, silty clay loam and sandy clay loam with 15 to 30 percent clay. It is slightly acid or neutral.
COMPETING SERIES: These are the Konert, Lakaskia, Reed and Rowe series. The Lakaskia, Reed, and Rowe soils have a mollic epipedon less than 20 inches thick. In addition, the Lakaskia and Rowe soils have secondary carbonates within 60 inches. The Konert soils have a mean annual soil temperature of 47 to 52 degrees F. , has aquic conditions and chroma of 2 or less at a depth of 10 to 20 inches.
GEOGRAPHIC SETTING: Conser soils are in depressions on stream terraces at elevations of 100 to 1,300 feet. Slopes are 0 to 3 percent. The soils formed in silty and clayey mixed alluvium of sedimentary and basic igneous materials. The summers are warm and dry and the winters are cool and moist. The mean annual precipitation is 30 to 60 inches. Mean annual temperature is 50 to 55 degrees F, average January temperature is about 39 to 40 degrees F, and average July temperature is about 65 to 68 degrees F. The frost-free season is 160 to 235 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Awbrig,
Clackamas,
Coburg,
Malabon, and
Redbell soils. Awbrig soils do not have a mollic epipedon and have an abrupt textural change from the A to the Bt horizons. They are in depressions on terraces. Clackamas soils are fine-loamy, have very
gravelly or extremely gravelly C horizons and are on higher terraces. Coburg soils have oxyaquic conditions at a depth of 30 to 40 inches. Malabon soils do not have oxyaquic conditions within 40 inches and are on higher terraces. Redbell soils have aquic conditions with chroma of 2 or less at a depth of 10 to 20 inches.
DRAINAGE AND PERMEABILITY: Poorly drained, slow runoff to ponded; slow permeability. This soil is subject to rare flooding. An apparent water table is at its uppermost limit from December toApril and is ponded from January to March.
USE AND VEGETATION: These soils are used for grass seed, hay and pasture crops. Natural vegetation is Oregon ash, rose, spirea, hawthorn and sedges.
DISTRIBUTION AND EXTENT: Depressions on low stream terraces of the Willamette and Umpqua Valleys, Oregon; MLRA 1, 5. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Benton County (Benton Area), Oregon, 1970.
REMARKS: Diagnostic horizons and features include:
Mollic epipedon - the zone from 0 to 27 inches (A, BAg and Btg horizons)
Argillic horizon - the zone from 14 to 44 inches (Btg and BCtg horizons)
Vertic feature - the zone from 0 to 40 inches has an estimated linear extensibility of 6.0 cm or more.
Aquolls feature - chroma of 2 or less in the lower part of the mollic epipedon and prominent masses of iron accumulation.