LOCATION GINGER OREstablished Series
TAXONOMIC CLASS: Medial over clayey, ferrihydritic over isotic, nonacid, isomesic Typic Melanaquands
TYPICAL PEDON: Ginger medial silt loam, pastureland, on a 2 percent slope at an elevation of 30 feet. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 8 inches; black (10YR 2/1) medial silt loam, very dark gray (10YR 3/1) dry; strong fine medium and coarse granular structure; soft, very friable, nonsticky and slightly plastic; weakly smeary; many very fine roots; many very fine irregular pores; strongly acid (pH 5.4); clear smooth boundary. (6 to 9 inches thick)
A--8 to 17 inches; black (10YR 2/1) medial silt loam, very dark gray (10YR 3/1) dry; moderate fine subangular blocky parting to strong fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; weakly smeary; many very fine roots; many very fine irregular and tubular pores; strongly acid (pH 5.4); clear smooth boundary. (6 to 12 inches thick)
2BA--17 to 20 inches; very dark grayish brown (10YR 3/2) silty clay loam, grayish brown (10YR 5/2) dry; few fine faint grayish brown (10YR 5/2) iron depletions, irregular in the matrix, and common fine prominent yellowish brown (10YR 5/6) iron masses, irregular in the matrix; moderate medium subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; many roots; many very fine tubular pores; few thin black (10YR 2/1) organic coatings on ped surfaces; strongly acid (pH 5.2); clear smooth boundary. (0 to 5 inches thick)
2Bg1--20 to 28 inches; dark grayish brown (10YR 4/2) silty clay, light brownish gray (10YR 6/2) dry, common fine faint light brownish gray (10YR 6/2) iron depletions, irregular in the matrix, and prominent yellowish brown (10YR 5/6) iron masses, irregular in the matrix; moderate very fine blocky structure; moderately hard, firm, moderately sticky and moderately plastic; common very fine roots; few medium and very fine pores and common fine tubular pores; common thin, very dark grayish brown (10YR 3/2) organic coatings on ped surfaces and in old root channels; strongly acid (pH 5.2); gradual smooth boundary. (6 to 12 inches thick)
2Bg2--28 to 38 inches; grayish brown (10YR 5/2) silty clay, light brownish gray (10YR 6/2) dry; many fine prominent strong brown (7.5YR 5/6) and yellowish red (5YR 5/6) iron masses, irregular in the matrix; strong very fine and fine subangular blocky structure; moderately hard, firm, moderately sticky and moderately plastic; few very fine roots; common fine and very fine tubular pores; many very dark grayish brown (10YR 3/2) organic coatings on ped surfaces and in fine pores and old root channels; strongly acid (pH 5.2); gradual wavy boundary. (8 to 14 inches thick)
2Bg3--38 to 52 inches; grayish brown (2.5Y 5/2) silty clay, light gray (2.5Y 7/2) dry; many fine prominent yellowish red (5YR 5/8) and strong brown (7.5YR 5/6) iron masses, irregular in the matrix; moderate medium angular blocky parting to weak very fine blocky structure; moderately hard, firm, moderately sticky and moderately plastic; very few very fine roots; few medium, fine, and very fine tubular pores; 10 percent rounded paragravel; strongly acid (pH 5.2); abrupt wavy boundary. (12 to 14 inches thick)
3C--52 to 60 inches; variegated strong brown (7.5YR 4/6), dark brown (7.5YR 3/4), and dark grayish brown (10YR 4/2) extremely gravelly sandy loam, yellowish brown (7.5YR 5/6, 5/8) and grayish brown (10YR 5/2) dry; massive, moderately hard, firm, nonsticky and nonplastic; intermittent weakly cemented lenses; 65 percent rounded gravel and 10 percent rounded cobbles.
TYPE LOCATION: Tillamook County, Oregon; about 0.4 miles south of junction of old highway 6 and Marolf loop road west of Fair Grounds, 2500 feet west, 550 feet north of the southeast corner of section 29, T 1 S., R. 9 W. Tillamook, Oregon 7.5 minute topographic quadrangle. Latitude 45 degrees, 27 minutes, 01 seconds N. and Longitude 123 degrees, 48 minutes, 53 seconds W. NAD 27.
RANGE IN CHARACTERISTICS: These soils are usually moist, are saturated for prolonged periods during the winter, and are dry less than 45 consecutive days between the depths of 4 and 12 inches during the summer.. The mean annual soil temperature is about 52 degrees F. Soil depth is over 60 inches, but rooting depth is limited by the seasonal water table. Redoximorphic features and/or a soil matrix color moist of 2 or less occur at depths of 12 to 20 inches. The umbric epipedon is 12 to 20 inches thick Depth to the 3C horizon is below 40 inches.
The A horizon has hue of 10YR, value of 2 or 3 moist, 3 through 5 dry, and chroma of 1 or 2 moist and dry. Value of 3 moist occurs below 12 inches in some pedons. Texture is medial silt loam. Clay content by field estimate is 18 to 25 percent. It has 0 to 10 percent rounded gravel and 0 to 10 percent rounded paragravel. The moist bulk density is 0.80 to 0.90 grams per cubic centimeter, P retention is 90 to 100 percent, and the acid oxalate extractable aluminum plus one-half the iron is 2 to 3 percent. Organic carbon is 6 to 10 percent.
The 2BA horizon, when present, has hue of 10YR, value of 3 moist, 4 or 5 dry, and chroma of 2 moist and dry. Texture is silty clay loam. Clay content is 30 to 35 percent. It has 0 to 10 percent rounded gravel and 0 to 10 percent rounded paragravel.
The 2Bw or 2Bg horizon has hue of 10YR or 2.5Y, value of 4 or 5 moist and 5 through 7 dry, and chroma of 2 moist and dry. Texture is silty clay loam or silty clay with 35 to 50 percent clay. It has 0 to 10 percent rounded gravel and 0 to 10 percent rounded paragravel.
The 3C horizon has hue of 7.5YR through 2.5Y, value of 3 through 5 moist, 4 through 7 dry, and chroma of 2 through 8 moist and dry and is variegated. Texture is extremely gravelly sandy loam, extremely gravelly loamy sand, sandy loam, or loamy sand. Clay content is 3 to 15 percent. It has 0 to 65 percent rounded gravel and 0 to 10 percent rounded cobbles. It has intermittent very weakly to weakly cemented lenses throughout.
COMPETING SERIES: There are no competing or closely related series.
GEOGRAPHIC SETTING: The Ginger soils are on nearly level or concave positions on stream terraces. Elevations range from 20 to 200 feet. The soils formed of mixed alluvium derived from igneous and sedimentary rocks. The climate is characterized by cool wet winters and cool moist summers with fog and low clouds. The mean annual precipitation is 80 to 100 inches and the mean annual temperature is 49 to 52 degrees F. The mean January temperature is 43 degrees F., and the mean July temperature is 61 degrees F. The frost-free season is 160 to 260 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Chitwood, Hebo, Knappa and Quillamook soils. Chitwood and Knappa soils lack a melanic epipedon and have a moist soil bulk density of 0.90 to 1.0 grams per cubic centimeter in the surface. Hebo soils are poorly drained. Knappa soils are well drained and are fine-silty. Quillamook soils are well drained and have clay contents of less than 35 percent in the texture control section. All of these soils are on coastal valley and marine terraces.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained; slow runoff; slow permeability. An apparent water table is at its uppermost depth limit November through May.
USE AND VEGETATION: The soils are dominantly used for pasture and forage crops. Other uses include homesite and wildlife habitat. Native vegetation includes Sitka spruce, western hemlock, red alder, salmonberry, western swordfern, red elderberry, willow, scattered rushes and sedges, and grasses.
DISTRIBUTION AND EXTENT: Coastal areas of Oregon; MLRA 4A.. The series is inextensive.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon
SERIES ESTABLISHED: Tillamook County, Oregon, 1961.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Umbric Epipedon-from the surface to a depth of 17 inches (Ap and A horizons)Andic Feature-from the surface to a depth of 17 inches (Ap and A horizons)
Melanic Epipedon-from the surface to a depth of 17 inches (Ap and A horizons with value and chroma moist of 2 or less and a melanic index of 1.65 and organic content of 6 to 10 percent, based on data collected on similar soils).
Cambic Horizon-20 to 52 inches (2Bg1, 2Bg2, and 2Bg3 horizons)