LOCATION ROMIA                   OK

Established Series
Rev. ELC:JWF
07/2022

ROMIA SERIES

The Romia series consists of deep, well drained, moderately permeable soils that formed in material weathered from sandstone of Cretaceous age. These soils are on sideslopes or crests of
ridges on gently sloping to moderately steep uplands in the Southern Coastal Plains. Water runs off the surface slow to rapid. Slopes are 3 to 20 percent.

TAXONOMIC CLASS: Fine-loamy, siliceous, active, thermic Ultic Hapludalfs
stated.)

TYPICAL PEDON:

A1--0 to 6 inches; dark brown (7.5YR 3/2) cobbly loamy fine sand, brown (7.5YR 5/2) dry; weak Very fine granular structure; soft, very friable; 20 percent cobblestones by volume; moderately acid; clear smooth boundary. (3 to 8 inches thick)

A2--6 to 18 inches; reddish brown (5YR 5/4) gravelly fine sand, light reddish brown (5YR 6/4) dry; single grained; loose dry or moist; 20 percent cobblestones and 30 percent pebbles; strongly acid; clear wavy boundary. (6 to 17 inches thick)

B21t--18 to 34 inches; yellowish red (5YR 5/6) sandy clay loam, light reddish brown (5YR 6/4) dry; weak coarse prismatic structure parting to moderate medium subangular blocky structure; hard, firm; few clean sand grains; clay films bridging sand grains; very strongly acid; gradual smooth boundary. (12 to 24 inches thick)

B22t--34 to 47 inches; red (2.5YR 4/8) sandy clay loam, red (2.5YR 5/8) dry; containing common medium prominent reddish yellow (7.5YR 6/8) mottles; weak coarse prismatic structure parting to moderate medium subangular blocky structure; hard, firm; clay films on faces of peds; very strongly acid. (10 to 24 inches thick)

Cr--47 to 56 inches; soft sandstone.

TYPE LOCATION: Bryan County, Oklahoma; about 8 miles west and 2 1/2 miles north of Durant, Oklahoma; about 1,650 feet west and 2,600 feet north of the southeast corner in sec. 13, T. 6 S., R. 7
E.

RANGE IN CHARACTERISTICS: Solum thickness and depth to sandstone range from 40 to 60 Inches.
The A1 horizon has hues of 7.5YR or 10YR, with values of 3 to 5, and chromas of 2 to 4.
The A2 horizon has hues of 5YR to 10YR, with values of 5 or 6, and chromas or 2 to 4.
The fine earth fraction of the A horizon is fine sandy loam, fine sand, or loamy fine sand. Cobbly and gravelly phases are recognized. Reaction ranges from slightly acid through strongly acid. The volume of pebbles less than 3 inches in diameter ranges from 0 to 15 percent, and those greater than 3 inches in diameter range from 2 to 15 percent.
The B2t horizon has hues of 2.5YR or 5YR, with values of 4 or 5, and chromas of 4 to 8. The lower part of the B2t horizon has reddish, yellowish, or brownish mottles in most pedons. Grayish mottles occur below a depth of 30 inches in some pedons. The fine earth fraction of the B2t horizon is sandy clay loam or clay loam. Gravelly phases are recognized. The volume of pebbles less than 3 inches in diameter ranges from 0 to 35 percent. The clay content ranges from 20 to 35 percent. Reaction ranges from medium acid through very strongly acid.
The Cr horizon is rippable sandstone and, in some pedons, is laminated with bands of ironstone.

COMPETING SERIES: These are the Bolivar, Pamunkey, Sandhill, Stiversville, and Toine series. All have mixed mineralogy.

GEOGRAPHIC SETTING: Romia soils occur on gently sloping to moderately steep uplands on sideslopes or crests of ridges.
Slopes range from 3 to 20 percent. The soils formed in sandy and loamy materials weathered from sandstone. Average annual precipitation ranges from 40 to 50 inches. Mean annual temperature ranges from 62 degrees to 70 degrees F.

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bernow and Bosville series. Bernow and Bosville soils have sola more than 60 inches thick. In addition, Bernow soils occur on footslopes and contain 5 to 15 percent albic materials in the lower Bt horizon. Bosville soils occur on slightly concave areas and have wetness mottles within 30 inches of the surface and the clay percentage increases more than 15 percent absolute between the A and B horizon.

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

USE AND VEGETATION: Mainly used for bermudagrass pasture. Native vegetation is black oak, post oak, red oak, and hickory with an understory of grass.

DISTRIBUTION AND EXTENT: Southern coastal plains of Oklahoma, possibly Arkansas, Louisiana, and Texas. The series is of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Bryan County, Oklahoma; 1975.

REMARKS: Romia soils formerly were included in the Ruston series and classified in the Red-Yellow Podzolic great soil group.

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National Cooperative Soil Survey
U.S.A.