LOCATION ZENORIA LAEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Aeric Endoaquults
TYPICAL PEDON: Zenoria clay loam, on a 0.5 percent, slightly convex slope in a hardwood forest, subject to occasional flooding. (Colors are for moist soil unless otherwise stated.)
Al--0 to 2 inches; dark grayish brown (10YR 4/2) clay loam; weak thin platy structure; firm; many fine, medium and few coarse roots; very strongly acid; clear smooth boundary.
A2--2 to 10 inches; dark gray (10YR 4/1) clay; moderate coarse subangular blocky structure parting to strong fine and medium subangular blocky; very firm; many fine, medium, and coarse roots; many fine and medium distinct strong brown (7.5YR 4/6 and 5/6) masses of iron accumulation; extremely acid; clear smooth boundary. (Combined thickness of the A horizons is 6 to 20 inches)
2Btg/Eb--10 to 19 inches; grayish brown (2.5Y 5/2) sandy clay loam (Bt); weak coarse prismatic structure parting to moderate medium subangular blocky; firm; common fine, medium, and coarse roots; few thin patchy clay films on faces of peds; common streaks of light brownish gray (2.5Y 6/2) fine sandy loam and thin coatings of clean sand and silt grains on faces of some peds(E); common fine and medium prominent yellowish brown (10YR 5/6) and strong brown (7.5YR 5/6) masses of iron accumulation; extremely acid; clear smooth boundary. (0 to 10 inches thick)
2Btgb1--19 to 33 inches; grayish brown (2.5Y 5/2) sandy clay loam; moderate coarse prismatic structure parting to moderate coarse subangular blocky; firm; few fine, medium, and coarse roots; common distinct dark grayish brown (10YR 4/2) clay films on faces of peds; thin coatings of clean sand and silt on faces of some peds; common fine hard brown and black Fe&Mn nodules; many medium and coarse prominent strong brown (7.5YR 4/6 and 5/6) masses of iron accumulation; few fine prominent red (2.5YR 4/8) masses of iron accumulation; extremely acid; clear smooth boundary.
2Btgb2--33 to 52 inches; grayish brown (2.5Y 5/2) sandy clay loam; weak coarse prismatic structure parting to moderate medium subangular blocky; firm; few fine roots; common distinct dark grayish brown (10YR 4/2) clay films on faces of peds; thin coatings of clean sand and silt grains on faces of some peds; few fine hard brown and black Fe&Mn nodules; common medium and coarse distinct strong brown (7.5YR 5/6) masses of iron accumulation; many fine and medium prominent red (2.5YR 4/6) masses of iron accumulation; extremely acid; clear smooth boundary (Combined thickness of the 2Bt horizons is 15 to 40 inches).
2BCgb--52 to 67 inches; light brownish gray (2.5Y 6/2) loam; weak coarse subangular blocky structure; friable; few fine roots; few thin patchy clay films on faces of peds; common fine and medium strong brown (7.5YR 5/6) brittle bodies; many fine and medium prominent strong brown (7.5YR 5/6 and 5/8) masses of iron accumulation; few fine prominent red (2.5YR 4/8) masses of iron accumulation; common fine distinct light olive brown (2.5Y 5/4) masses of iron accumulation; extremely acid; clear smooth boundary (0 to 20 inches thick).
3Cg1--67 to 75 inches; variegated in a coarse pattern, light brownish gray (2.5Y 6/2) and light olive brown (2.5Y 5/4) loamy fine sand; massive; very friable; few fine prominent strong brown (7.5YR 5/6) masses of iron accumulation; extremely acid; gradual smooth boundary.
3Cg2--75 to 80 inches; light brownish gray (2.5Y 6/2) fine sand; massive; very friable; common coarse faint light yellowish brown (2.5Y 6/4) masses of iron accumulation; common medium distinct light olive brown (2.5Y 5/6) masses of iron accumulation; extremely acid.
TYPE LOCATION: LaSalle Parish, Louisiana; 3.5 miles south of White Sulphur Springs; 2.4 miles northeast on La. Hwy. 8 from the Little River bridge, 4.3 miles east and south on improved parish road, 1.3 miles south on gravel road, 1.6 miles west on dirt road, 0.4 miles south on trail to highline, 0.1 mile east on highline, 50 feet south of highline in the NE 1/4 NW 1/4 sec. 33, T.7 N., R. 2 E.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 70 inches. Depth to buried soil horizons ranges from 6 to 20 inches. Reaction ranges from extremely acid to strongly acid throughout the solum.
The Al or Ap horizon has hue of 10YR, value of 3 or 4, and chroma of 1 or 2. Texture is clay loam or silty clay loam.
The A2 horizon has hue of 10YR, value of 4 or 5, and chroma of 1 or 2. Texture is clay, silty clay, or silty lay loam.
The 2Btg/Eb horizon, where present, has hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 1 or 2 (Bt part). The E part makes up 15 to 40 percent of horizon. It has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 1 or 2. Subhorizons are present in some pedons that have hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 3. Texture is fine sandy loam, sandy clay loam, clay loam, or loam. Iron accumulations are in shades of red, brown, and yellow.
The 2Btgb horizon has hue of 10YR or 2.5Y, value of 4 to 6, and chroma of 1 or 2. Subhorizons are present in some pedons that have hue of 10YR or 2.5Y, value of 4 or 5, and chroma of 3. Texture is sandy clay loam, clay loam, or loam. Mottles are in shades of red, brown, and yellow.
The 2BCgb or 2BCb horizon, where present, has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 2 to 4. Texture is loam, fine sandy loam, very fine sandy loam, or loamy fine sand.
The 3Cg or 3C horizon has hue of 10YR or 2.5Y, value of 5 or 6, and chroma of 1 to 3. It is loam, fine sandy loam, or very fine sandy loam in the upper part and loamy fine sand or fine sand in the lower part.
COMPETING SERIES: These are the Augusta, Bertie, and Yemassee series in closely related families. All of these soils have a semiactive activity class, and none has a clayey surface mantle. In addition, Augusta and Bertie soils have mixed mineralogy.
GEOGRAPHIC SETTING: Zenoria soils are on low terraces along major streams draining the uplands of the Western Coastal Plains. They formed in loamy alluvium mantled by a thin layer of more recent clayey sediments. Slopes range from 0 to 2 percent. The climate is warm and humid. Near the type location, the mean annual temperature is 65 degrees F., and the mean annual precipitation is about 59 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bienville, Cahaba, Guyton, and Una soils. The Bienville and Cahaba soils are on higher positions and are better drained. Guyton soils are on lower positions and have a fine-silty control section. Una soils are on lower positions and have a fine textured control section.
DRAINAGE AND PERMEABILITY: Poorly drained. Runoff is medium on slopes up to 1 percent, and high on slopes more than 1 percent. Permeability is slow. The soil is wet in all layers below a depth of 1.5 to 2.5 feet for long periods during December through April in normal years. Flooding is occasional or frequent during December through June.
USE AND VEGETATION: Most areas of Zenoria soils are in hardwood forest. A few areas are used for pasture. The major tree species are willow oak, water oak, sweetgum, Nuttall oak, green ash, and baldcypress.
DISTRIBUTION AND EXTENT: Western Coastal Plain (MLRA 133B) of Louisiana and possibly in Mississippi, Arkansas, and eastern Texas. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: LaSalle Parish, Louisiana, l986. The series was reclassified from an Alfisol to an Ultisol as indicated by lab data on the type location pedon in April, 2000.
REMARKS: A few chipped stone artifacts are present in the Btg/Eb horizon in the type location pedon. Diagnostic horizons and features recognized in this pedon include:
Ochric epipedon ----------- 0 to 10 inches (A1 and A2 horizons).
Glossic horizon ---------- 10 to 19 inches (2Btg/Eb horizon).
Argillic horizon --------- 10 to 52 inches (Btg/Eb and 2Btgb horizons horizons).
Lithologic discontinuity - 10 inches (top of the 2Btg/Eb horizon)
Aquic conditions --------- 10 to 19 inches (2Btg/Eb horizon)
ADDITIONAL DATA: Laboratory analyses were run on samples from the type location pedon by the Louisiana Agricultural Experiment Station (S85LA-059-006).