LOCATION WOLFPEN TX+LAEstablished Series
TAXONOMIC CLASS: Loamy, siliceous, semiactive, thermic Arenic Paleudalfs
TYPICAL PEDON: Wolfpen loamy fine sand--in a pasture.
(Colors are for moist soil unless otherwise stated.)
A--0 to 6 inches; brown (10YR 4/3) loamy fine sand, brown (10YR 5/3) dry; weak medium granular structure; loose; many very fine and common fine roots; very strongly acid; clear wavy boundary. (4 to 12 inches thick)
E--6 to 27 inches; pale brown (10YR 6/3) loamy fine sand, very pale brown (10YR 7/3) dry; single grained; loose; many very fine roots; common fine black concretions; very strongly acid; clear wavy boundary. (16 to 28 inches thick)
Bt1--27 to 31 inches; yellowish brown (10YR 5/6) sandy clay loam, brownish yellow (10YR 6/6) dry; common medium faint yellowish brown (10YR 5/4), and dark yellowish brown (10YR 3/4) mottles; moderate fine and medium subangular blocky structure; very hard, friable; common very fine roots; few very fine pores; thick continuous dark yellowish brown (10YR 4/4) clay films on faces of peds; strongly acid; clear wavy boundary. (4 to 12 inches thick)
Bt2--31 to 38 inches; yellowish brown (10YR 5/4) sandy clay loam, light yellowish brown (10YR 6/4) dry; common medium and coarse faint strong brown (7.5YR 5/6), few medium distinct grayish brown (10YR 5/2), and yellowish red (5YR 4/8) mottles; moderate coarse prismatic structure parting to weak medium subangular blocky; very hard, friable; common very fine roots; few very fine pores; thick continuous dark yellowish brown (10YR 4/4) clay films on faces of peds; moderately acid; gradual wavy boundary. (6 to 18 inches thick)
Bt3--38 to 55 inches; yellowish brown (10YR 5/8) sandy clay loam; brownish yellow (10YR 6/8) dry; few medium faint strong brown (7.5YR 5/6) mottles; moderate medium and coarse prismatic structure parting to moderate medium subangular blocky; very hard, friable; common very fine roots; few very fine pores; thick continuous dark yellowish brown (10YR 4/4) clay films on faces of peds; few streaks of clean sand in the lower part; moderately acid; gradual wavy boundary. (0 to 18 inches thick)
Bt/E--55 to 70 inches; yellowish brown (10YR 5/6) sandy clay loam, brownish yellow (10YR 6/6) dry; common coarse distinct red (2.5YR 4/6) mottles moderate coarse subangular blocky structure; very hard, friable; common fine roots; few very fine pores; clay films on surface of some peds; vertical streaks 1 to 3 cm wide of light gray (10YR 7/2) clean sand extend throughout the horizon and are 8 to 14 inches apart; few pockets up to 5 inches across of clean sand grains are in the lower part; sand makes up 7 to 10 percent by volume; few black concretions 5 to 10 mm in diameter; moderately acid; gradual wavy boundary. (10 to 40 inches thick)
B't--70 to 80 inches; prominently mottled gray (10YR 6/1), red (2.5YR 4/6), and yellowish brown (10YR 5/8) sandy clay loam; weak medium and coarse subangular blocky structure; very hard, firm; few fine roots; few very fine pores; thin patchy clay films on surface of some peds; strongly acid.
TYPE LOCATION: Hopkins County, Texas; about 15 miles east of Sulphur Springs on Interstate Highway 30; 3.8 miles south on Farm Road 269 to Pine Forest Community Center, 250 feet northwest of Center in pasture.
RANGE IN CHARACTERISTICS: Solum thickness is more than 80 inches. The clay content of the control section ranges from 18 to 30 percent. Some pedons have a few siliceous or ironstone pebbles that make less than 5 percent by volume. The reaction ranges from very strongly acid to slightly acid throughout unless limed.
The A horizon has colors with hue of 10YR, value of 3 to 5, and chroma of 2 to 4. Horizons with value of 3 are less than 7 inches thick. The texture is loamy fine sand or fine sand.
The E horizon has colors with hue of 10YR, value of 5 to 7, and chroma of 2 to 4. Some pedons have a BE horizon with chroma of 6 or 8. The texture of the E or BE horizon is loamy fine sand or fine sand.
The Bt horizon has matrix colors with hue of 7.5YR or 10YR, value of 5 or 6, and chroma of 4 to 8. Mottles of these colors and mottles in shades of red, yellow, brown or gray range from none to common. Some pedons have a mottled matrix of these colors in the lower part and below a depth of 40 inches. Mottles with chroma of 2 or less are below a depth of 30 inches. The texture is mainly sandy clay loam, however some pedons have clay loam or fine sandy loam horizons. Clean sand and silt in streaks or pockets range from none to about 15 percent by volume but typically makes up 3 to 10 percent of a lower Bt/E horizon. Some pedons have up to 4 percent plinthite nodules or more than 5 percent plinthite below a depth of 60 inches.
COMPETING SERIES: These include the Larton and Larue series in the same family and the similar Briley, Heatly, Heaton, Lilbert, Nobscot, Pickton and Silstid soils. Larton and Larue soils have argillic horizons with hue redder than 7.5YR, in addition Larton soils have control sections with less than 18 percent clay. Briley and Lilbert soils have base saturation of less than 35 percent. Heatly, Heaton, Nobscot and Silstid soils are members of the ustic moisture regime. Pickton soils have grossarenic surfaces.
GEOGRAPHIC SETTING: Wolfpen soils occupy nearly level to moderately steep uplands of the Coastal Plain. The soils formed in lentil sands mainly of the Queen City and Wilcox Geologic Group. Slopes are mainly 1 to 4 percent but range up to about 15 percent. Mean annual precipitation is 40 to 50 inches, average annual temperature is 64 to 66 degrees F., and the Thornthwaite P-E index is about 68. Frost free days range from 235 to 270 and elevation is 400 to 700 feet above sea level.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Pickton series and the Bernaldo, Duffern, Freestone, Gallime, Tonkawa and Woodtell soils. Pickton soils are on similar or slightly higher positions. Bernaldo, Freestone, Gallime and Woodtell soils have loamy surface layers and mainly are on slightly lower positions in the landscape. Duffern and Tonkawa soils lack Bt horizons and are on slightly higher positions.
DRAINAGE AND PERMEABILITY: Well drained; moderate permeability; very low to low runoff.
USE AND VEGETATION: Most areas have been cleared and cultivated but are now in pasture. Bermudagrass, Pensacola Bahia, and lovegrass are the most important pasture grasses. Overstory vegetation includes red oak, blackjack oak, sweetgum, elm, hickory, and pine.
DISTRIBUTION AND EXTENT: Southern Coastal Plain of Texas and possibly adjoining states. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Hopkins County, Texas; 1973.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from the surface to a depth of 27 inches (the A and E horizons)
Argillic horizon - from 27 to 80 inches
ADDITIONAL DATA: Lincoln Soil Survey Laboratory sample nos. 72L222 and 72L223. TAMU S82TX22301, Lab. nos. 1438 to 1444.