LOCATION OZAN AR+MS TX
Established Series
Rev. LBW
05/2022
OZAN SERIES
The Ozan series consists of deep, poorly drained, slowly permeable soils that formed in loamy alluvium. These level soils are on flood plains and concave depressional low terraces along streams in the Western Coastal Plain. Mean annual temperature is about 64 degrees F and the mean annual precipitation is about 49 inches. Slopes range from 0 to 1 percent.
TAXONOMIC CLASS: Coarse-loamy, siliceous, subactive, thermic Typic Glossaqualfs
TYPICAL PEDON: Ozan silt loam, 1 percent slope, forested.
(Colors are for moist soil unless otherwise stated.)
A--0 to 6 inches; light brownish gray (10YR 6/2) silt loam; common fine faint pale brown mottles; weak medium granular structure; very friable; many fine and medium roots; very strongly acid; clear smooth boundary. (4 to 7 inches thick)
Eg--6 to 15 inches; light gray (10YR 7/1) silt loam; common coarse faint pale brown (10YR 6/3) and common fine distinct yellowish brown mottles; weak medium subangular blocky structure; friable; many fine and medium roots; strongly acid; gradual irregular boundary. (5 to 10 inches thick)
Btg/Eg--15 to 29 inches; light gray (10YR 7/1) loam; common medium distinct yellowish brown (10YR 5/4) mottles; weak medium subangular blocky structure: friable; tongues 1 to 2 inches wide of light gray (10YR 7/1) silt from above make up about 20 percent of the horizon; sand grains coated and bridged with clay in the loam part; few fine roots; very strongly acid; gradual smooth boundary.
Btg1--29 to 38 inches; light gray (10YR 7/1) loam; common medium distinct yellowish brown (10YR 5/8) and brownish yellow (10YR 6/6) mottles; moderate medium subangular blocky structure; firm; thin patchy clay films on ped faces; sand grains coated and bridged with clay; few fine roots; common fine pores; few fine black concretions; few fine quartz pebbles less than 1/2 inch in diameter; strongly acid; gradual smooth boundary.
Btg2--38 to 56 inches; light gray (10YR 7/1) loam; common fine distinct yellowish brown mottles; moderate medium subangular blocky structure; firm; sand grains coated and bridged with clay; few fine pores; few fine black concretions; few fine quartz pebbles less than 1/2 inch in diameter; moderately acid; gradual wavy boundary. (Combined thickness of the Btg horizon ranges from 30 to 60 inches.)
BCg--56 to 72 inches; light gray (10YR 7/1) loam; common medium distinct yellowish brown (10YR 5/4) mottles; weak medium subangular blocky structure; friable; few fine black concretions; few fine pores; moderately acid.
TYPE LOCATION: Howard County, Arkansas; 1 mile southwest of Muddy Fork; SE1/4SW1/4NW1/4, sec. 29, T. 7 S., R. 27 W.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 60 to more than 80 inches. Reaction ranges from very strongly acid to moderately acid throughout.
The A horizon has hue of 10YR, value of 4, 5, or 6 and chroma of 2. Texture is silt loam, loam, fine sandy loam, or very fine sandy loam. Mottles are in shades of brown.
The E horizon has hue of 10YR, value of 6 or 7 and chroma of 1 or 2. Texture is silt loam, loam, fine sandy loam, or very fine sandy loam. Mottles are in shades of brown. Tongues of E material extend into the underlying argillic horizon. They are 1 to 2 inches in diameter in the upper part and taper with depth to about 1/2 inches with the lower part surrounded by a cup of clay enriched material. They make up as much as 25 percent of the upper part of the argillic .
The Btg horizon has hue of 10YR, value of 5, 6, or 7, and chroma of 1 or 2. Mottles are in shades of brown. Texture is fine sandy loam, loam, sandy clay loam.
The BC horizon has colors similar to the B. Mottles are in shades of brown. Texture is loam, very fine sandy loam, or fine sandy loam.
COMPETING SERIES: These include the
Gessner series in the same family and
Clodine,
Colita,
Plank,
Sorter,
Vimville, and
Waller in closely related families. Gessner soils are neutral to moderately alkaline in the argillic horizon. Colita, Vimville, and Waller soils are in a fine-loamy particle size class. Clodine and Sorter soils do not have glossic properties and Plank soils are in a coarse-silty particle size class.
GEOGRAPHIC SETTING: Ozan soils occur on level flood plains and concave depressional low terraces. These soils formed in loamy alluvial sediments mainly from Coastal Plains uplands. Slopes range from 0 to 1 percent. The mean annual temperature is about 64 degrees F and the mean annual precipitation is about 49 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These include
Guyton,
Kirkville,
Sardis, and
Toine. Guyton soils, which occur on similar flood plains are in a fine-silty particle size class. Kirkville soils, which occur on adjacent terraces, do not have an argillic horizons and are better drained. Sardis soils, which occur on similar landscapes, do not have argillic horizons and are better drained. Toine soils, which occur on similar landscape positions, are in a fine-loamy particle size class and are better drained.
DRAINAGE AND PERMEABILITY: Poorly drained; slow runoff; moderately slow internal drainage; slow permeability. Some areas of these soils commonly flood a few times each year, usually during winter and early spring. A seasonally high water table is within 6 inches of the soil surface from December through April.
USE AND VEGETATION: Most areas in woodland of shortleaf pine, loblolly pine, sweetgum and oaks. Small areas have been cleared and are in pasture.
DISTRIBUTION AND EXTENT: Western Coastal Plain of Alabama, Arkansas, Louisiana, Mississippi, Oklahoma, and Texas. The series is of moderate extent.
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: TEMPLE, TEXAS
SERIES ESTABLISHED: Howard County, Arkansas; 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon:
Ochric epipedon - The zone from the surface to a depth of 15 inches.
Argillic horizon - The zone from a depth of 15 inches to 56 inches.
ADDITIONAL DATA: Characterization of the type location by the University of Arkansas soil characterization laboratory. Pedon No. S68AR-031-029.
National Cooperative Soil Survey
U.S.A.