LOCATION SCOTTSVILLE TXEstablished Series
TAXONOMIC CLASS: Fine-loamy over clayey, siliceous over smectitic, semiactive, thermic Glossaquic Paleudalfs
TYPICAL PEDON: Scottsville very fine sandy loam in a pasture on very gently sloping topography. (Colors are for moist soil unless otherwise stated.)
Ap--0 to 4 inches; dark brown (10YR 4/3) very fine sandy loam; weak fine granular structure; slightly hard, very friable; many fine and few medium roots; common fine pores; strongly acid; clear smooth boundary. (3 to 6 inches thick)
E--4 to 12 inches; yellowish brown (10YR 5/4) very fine sandy loam, common fine faint grayish brown (10YR 5/2) and common medium distinct yellowish brown (10YR 5/8) mottles; weak medium prismatic structure parting to moderate medium subangular blocky; slightly hard, very friable; common fine and few medium roots; few fine pores; strongly acid; clear smooth boundary. (0 to 12 inches thick)
Bt--12 to 19 inches; yellowish brown (10YR 5/6) loam; common fine prominent yellowish red (5YR 5/8) and few fine faint brown (10YR 5/3) mottles; weak medium prismatic structure parting to moderate medium subangular blocky; hard, very friable; common fine and few medium roots; common fine pores; few fine black concretions; few thin patchy clay films in pores and on faces of peds; about 3 percent by volume streaks and coatings of yellowish brown (10YR 5/4) clean sand and silt; strongly acid; gradual smooth boundary. (5 to 20 inches thick)
Bt/E1--19 to 30 inches; yellowish brown (10YR 5/6) loam (Bt); few fine and medium prominent red (2.5YR 4/8), many fine prominent yellowish red (5YR 5/8), and common fine faint grayish brown (10YR 5/2) mottles; weak medium prismatic structure parting to moderate fine subangular blocky; hard, friable; common fine and few medium roots; common fine and medium pores; few fine and medium black concretions; few thin patchy clay films in pores and on faces of peds; about 8 to 10 percent by volume coatings and interfingers and 2 to 3 percent tongues of pale brown (10YR 6/3) clean sand and silt (E); very strongly acid; clear wavy boundary. (4 to 12 inches thick)
Bt/E2--30 to 33 inches; yellowish brown (10YR 5/6) clay loam (Bt); many fine and medium prominent red (2.5YR 4/8) and many fine distinct light brownish gray (10YR 6/2) mottles; weak medium prismatic structure parting to moderate medium subangular blocky; very hard, friable; few fine roots; common fine pores; few fine black concretions; few thin patchy clay films in pores and on faces of peds; few fine ironstone pebbles; few fragments of petrified wood less than 3 inches across in lower part of layer; about 9 percent by volume coatings and interfingers and few tongues of light brownish gray (10YR 6/2) clean sand and silt (E); very strongly acid; clear wavy boundary. (0 to 10 inches thick)
2Btg--33 to 60 inches; light brownish gray (10YR 6/2) clay; many fine and medium prominent dark red (2.5YR 3/6) and few fine distinct strong brown (7.5YR 5/6) mottles; moderate coarse prismatic structure parting to moderate medium angular blocky; very hard, firm; few fine roots; few fine pores; few fine skeletans in upper two inches of horizon; few small slickensides; few thin patchy clay films on faces of peds; very strongly acid; clear smooth boundary. (20 to 50 inches thick)
2BCtg--60 to 80 inches; light gray (5Y 7/2) clay; many medium distinct yellowish brown (10YR 5/8) and common medium and coarse prominent yellowish red (5YR 5/8) mottles; weak coarse prismatic structure; extremely hard, very firm; few fine roots; few pressure faces; few thin patchy clay films on faces of peds; very strongly acid.
TYPE LOCATION: Harrison County, Texas; from the intersection of U. S. Highways 59 and 80 in Marshall; 0.5 mile south on U. S. Highway 59, 15.8 miles southeast on Farm Road 31, 1.75 miles east on Farm Road 451, 1.15 miles north on county road and 300 feet west in pasture.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. Depth to the clayey 2B horizon ranges from 20 to 40 inches. Petrified wood fragments range from none to a few near the upper boundary of the 2B horizon. The clay content in the fine-loamy portion of the particle-size control section averages 18 to 26 percent. There is an absolute increase of 25 to 40 percent clay with a transition layer less than 5 inches thick between the contrasting loamy and clayey horizons. Base saturation at a depth of 50 inches below the upper boundary of the Bt horizon typically ranges from 50 to 80 percent. The combined thickness of the A, E, and (where present) EB horizons ranges from 6 to 19 inches.
The A horizon has hue of 10YR, value of 3 to 5, and chroma of 2 to 4. The horizon is a fine sandy loam, very fine sandy loam, or silt loam. Reaction ranges from very strongly acid to medium acid unless limed.
The E horizon has hue of 10YR, value of 5 or 6, and chroma of 3 or 4. Mottles range from none to common in shades of brown or yellow. Texture is fine sandy loam, loam, or very fine sandy loam. Reaction ranges from very strongly acid to medium acid unless limed.
The EB horizon, where present, has hue of 7.5YR or 10YR, value of 5 or 6, and chroma of 6 or 8. Mottles range from none to few in shades of brown or yellow. Texture is fine sandy loam, very fine sandy loam, or loam. Reaction ranges from very strongly acid to medium acid unless limed.
The Bt horizon has hue of 10YR or 7.5YR, value of 5 or 6, and chroma of 4 to 8. Mottles range from none to common in shades of red, yellow, or brown. Mottles with chroma of 2 or less are within a depth of 18 to 29 inches from the surface; texture is loam, clay loam, or sandy clay loam. Coatings and interfingers of light gray to pale brown clean sand and silt range from 0 to 4 percent by volume. Reaction ranges from very strongly acid to strongly acid unless limed.
The Bt part of the Bt/E horizon has hue of 10YR or 7.5YR, value of 5 or 6, and chroma of 4 to 8. Mottles range from none to many in shades of red, yellow, or gray. Texture is loam, clay loam, or sandy clay loam. The E part of the horizon consists of coatings and interfingers of light gray to pale brown clean sand and silt ranging from 5 to 15 percent by volume. Dark concretions range from 0 to 5 percent by volume. Reaction is very strongly acid or strongly acid.
The 2Btg horizon has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 1 or 2. Mottles range from few to many in shades of red, yellow, or brown. Some pedons have a mottled matrix of these colors. In addition to the 2Btg horizon, some pedons have a 2Bt horizon that has a matrix color in shades of red, yellow, or brown with common to many grayish mottles. The clay content ranges from 50 to 60 percent. Some pedons have transitional layers less than 5 inches thick that are less clayey. Small slickensides and pressure faces range from few to common. Coatings and interfingers of clean sand and silt range from none to less than 5 percent by volume. Reaction is very strongly acid or strongly acid.
The 2BCtg and 2Cg horizons have hue of 7.5YR to 5Y, value of 5 to 7, and chroma of 1 or 2. Mottles range from few to many in shades of red, yellow, or brown. Some pedons have a mottled matrix of these colors. Some pedons have a 2BC or 2C horizon that has a matrix color in shades of yellow or brown with none to common gray, red, or brown mottles. Texture is clay, clay loam, sandy clay loam, or loam. Reaction ranges from very strongly acid to medium acid.
COMPETING SERIES: There are no competing series in the same family. Similar series are the Freestone, Glenmora, Keithville, Kolin, Kullit, Latex, Longview, Metcalf, Porum, Raino, Sawtown, Sawyer, and Vick. Freestone, Kullit and Latex soils lack strongly contrasting particle- size classes. Glenmora, Keithville, Kolin, Longview, Metcalf, Sawtown, Sawyer and Vick soils have fine-silty particle-size control sections. Porum soils have fine textured particle-size control sections. Raino soils have tongues throughout the upper part of the argillic horizon.
GEOGRAPHIC SETTING: Scottsville soils are on broad nearly level to very gently sloping uplands of the Gulf Coastal Plains. These soils occur on very gently undulating stream divides. Slopes range from 0 to 3 percent. The soils formed in thin loamy sediments and clayey deposits of the Wilcox Formation of the Tertiary period. The climate is warm and humid. The mean annual temperature ranges from 64 to 68 degrees F. The annual precipitation ranges from 44 to 54 inches. The Thornthwaite P-E index is about 74. Summer moisture deficit ranges from 4 to 6 inches but the normal precipitation deficiency is plus 8 inches. The frost-free precipitation ranges from 25 to 30 inches, and frost free days range from 220 to 250.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Latex soils and the Bernaldo, Eastwood, Guyton and Metcalf soils. Latex soils are on slightly higher oval shaped ridges and stream divides. Bernaldo soils are on slightly lower terrace positions and lack clayey 2B horizons. Eastwood soils have red clayey Bt horizons and are on adjacent gently sloping ridges and moderately steep sideslopes along drainageways. Guyton soils are on lower broad terrace positions and have gray subsoils. The Metcalf soils are on slightly lower wetter positions.
DRAINAGE AND PERMEABILITY: Scottsville soils are moderately well drained. Permeability is very slow. Runoff is medium and a perched water table from a depth of 1 to 3 feet intermittently occurs from the fall to spring months.
USE AND VEGETATION: Most of the Scottsville soils are used for timber production and for pasture or hayland. A few areas are used for cropland. Native vegetation consists of loblolly pine, hickory, sweetgum and southern red oak, with mid and tall grasses such as pinehill bluestem, longleaf uniola and panicums. American beautyberry, sumac, greenbriar and hawthorn species are part of the understory. Improved pastures consist mainly of coastal bermudagrass or bahiagrass commonly overseeded with arrowleaf clover. Many areas are replanted to loblolly pine for maximum timber production.
DISTRIBUTION AND EXTENT: Eastern Texas and possibly Louisiana. The series is of large extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Harrison County, Texas; 1989. The name is derived from a nearby community.
REMARKS: These soils were formerly included with the Freestone and Kullit series. They were also considered a clayey substratum phase of the Bernaldo series.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - from surface to a depth of 12 inches (A and E horizons).
Argillic horizon - from a depth of 12 to 80 inches (Bt, Bt/E1, Bt/E2, 2Btg, 2BCtg).
Glossic feature - The argillic horizon from 19 to 33 inches (Bt/E horizons) contains more than 5 percent by volume glossic materials of clean sand and silt.
Aquic feature - Low chroma mottles at 19 inches.
ADDITIONAL DATA: TAMU Soil Characterization Lab No's S84TX203-001 and (Type Location S84TX203-002); THD No. THD84TX203-1-5 and (Type Location THD84TX203-2-4).