LOCATION TEBO                    WA

Established Series
Rev. SGR/RFP/RJE
06/2011

TEBO SERIES

The Tebo series consists of very deep, well drained soils that formed in glacial till high in basalt. These are on glaciated uplands and have slopes of 1 to 65 percent. The mean annual temperature is about 52 degrees F. and the mean annual precipitation is about 65 inches.

TAXONOMIC CLASS: Fine-loamy, isotic, mesic Andic Dystroxerepts

TYPICAL PEDON: Tebo silt loam, on a south facing 10 percent slope under coniferous forest at 410 feet elevation. (Colors are for moist soil unless otherwise stated. All textures are apparent field textures. When described the soil was nearly dry to 6 inches, moist below.)

Oi--0 to 2 inches; accumulation of needles and twigs; abrupt smooth boundary. (1 to 4 inches thick)

Oe--2 to 3 inches; accumulation of partially decayed needles and twigs; many roots; abrupt smooth boundary. (0 to 2 inches thick)

A--3 to 12 inches; dark reddish brown (5YR 3/3) medial silt loam, brown (7.5YR 4/4) dry; weak fine granular structure; slightly hard, friable, slightly sticky and slightly plastic; many very fine and fine, common medium, and few coarse roots; common very fine tubular pores; 5 percent rounded and angular gravel and 5 percent cobbles; moderately acid (pH 5.8); clear smooth boundary. (7 to 9 inches thick)

AB--12 to 16 inches; dark reddish brown (5YR 3/4) gravelly clay loam, yellowish red (5YR 5/6) dry; weak fine subangular blocky structure that parts to moderate fine and medium granular; slightly hard, friable, slightly sticky and moderately plastic; many very fine and fine, common medium, and few coarse roots; many very fine tubular and interstitial pores; 10 percent rounded and angular gravel and 15 percent angular cobbles; moderately acid (pH 5.6); clear smooth boundary. (3 to 5 inches thick)

Bw1--16 to 33 inches; reddish brown (5YR 4/4) cobbly silty clay loam, yellowish red (5YR 5/6) dry; moderate fine subangular blocky structure that parts to weak very fine subangular blocky; slightly hard, friable, moderately sticky and moderately plastic; common very fine, many fine, and few medium and coarse roots; many very fine tubular and interstitial pores; 10 percent rounded and angular gravel and 15 percent angular cobbles; strongly acid (pH 5.2); clear smooth boundary. (15 to 19 inches thick)

Bw2--33 to 51 inches; brown (7.5YR 4/4) cobbly silty clay loam, strong brown (7.5YR 5/6) dry; weak fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few very fine and fine, common medium, and few coarse roots; many very fine tubular and interstitial pores; 10 percent rounded and angular gravel and 10 percent angular cobbles; very strongly acid (pH 5.0); gradual smooth boundary. (16 to 20 inches thick)

Bw3--51 to 60 inches; dark yellowish brown (10YR 4/4) cobbly clay loam, brown (7.5YR 5/4) dry; weak fine subangular blocky structure; slightly hard, friable, moderately sticky and moderately plastic; few fine and medium roots; common very fine tubular pores; 10 percent rounded and angular gravel and 20 percent angular cobbles; very strongly acid (pH 4.8); clear smooth boundary. (8 to 10 inches thick)

Bw4--60 to 65 inches; dark yellowish brown (10YR 4/4) gravelly clay loam with common fine distinct yellowish red (5YR 4/6) iron stains and black (N 2/) manganese coatings on ped surfaces, yellowish brown (10YR 5/4) dry with common fine prominent yellowish brown (10YR 5/8) iron stains and black (N 2/) manganese coatings on ped surfaces; strong angular blocky structure; hard, friable, moderately sticky and moderately plastic; few very fine roots; common very fine tubular pores; 15 percent rounded and angular gravel and 5 percent angular cobbles; very strongly acid (pH 5.0).

TYPE LOCATION: Grays Harbor County, Washington; about 1.5 miles due east of McCleary; 1,600 feet east and 200 feet north of the SW corner of section 7, T.18N., R.4W.

RANGE IN CHARACTERISTICS: The particle size control section is 10 to 35 percent coarse fragments and 27 to 35 percent clay. Angular basaltic gravel and cobbles as well as smooth glacial pebbles are throughout the profile. The mean annual soil temperature is 48 to 52 degrees F. The soil is moderately acid to very strongly acid. The soil is dry for 45 to 60 days following the summer solstice.

The A horizon has moist hue of 5YR or 7.5YR, value of 3 or 4 moist, 4 or 5 dry, and chroma of 2, 3 or 4 dry. It is silt loam, gravelly silt loam or gravelly clay loam and has 5 to 10 percent rounded and angular pebbles. It has weak subangular blocky, or weak or moderate granular structure.

The Bw horizon have moist hue of 5YR, 7.5YR or 10YR and value of 5 or 6 dry. It is gravelly or cobbly silty clay loam or gravelly or cobbly clay loam. It has weak or moderate subangular blocky structure.

COMPETING SERIES: These are the Heisler, Hugo, Madonna, Schnorbush and Yeary series. Heisler soils have shaly argillite, schist and shale fragments in the control section. (See remarks) Hugo soils are dry more than 100 days, have bedrock at 40 to 60 inches and have sandstone, shale, schist, and conglomerate rock fragments in the control section. Madonna soils have a lithic contact at 20 to 40 inches. Schnorbush soils have a solum 28 to 36 inches thick and have 35 to 60 percent soft siltstone fragments in the control section. Yeary soils have a paralithic contact at 20 to 40 inches.

GEOGRAPHIC SETTING: Tebo soils are on glaciated uplands, intermediate in position between the outwash plains and the higher basaltic mountainous areas. Slopes are 1 to 65 percent. Elevation ranges from 200 to 800 feet. These soils formed in glacial drift high in basalt. Tebo soils are in a humid marine climate with relatively cool, dry summers and cool, wet winters. They have an annual precipitation of 50 to 70 inches. The mean January temperature is 39 degrees F.; the mean July temperature is 62 degrees F.; and the mean annual temperature is about 52 degrees F. The growing season (28 degrees F.) is 200 to 240 days.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Schneider and Bunker soils. Schneider soils have a loamy-skeletal control section. Bunker soils have an umbric epipedon.

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

USE AND VEGETATION: Principal uses are timber production, watershed, wildlife habitat and recreation. The major tree species are Douglas fir and western hemlock with scattered western red cedar and red alder. Understory species include cascara, swordfern, brachenfern, holly, trailing blackberry and red huckleberry.

DISTRIBUTION AND EXTENT: Southwestern Washington in Grays Harbor and Mason Counties. This soil is of small extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Portland, Oregon

SERIES ESTABLISHED: Mason County, Washington, 1953.

REMARKS: Classification changed 4/94 and 1/00 because of amendments to Soil Taxonomy.
Heisler series description is old (1944) and the series is too poorly defined to clearly differentiate.

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National Cooperative Soil Survey
U.S.A.