LOCATION RUMPLE TXEstablished Series
TAXONOMIC CLASS: Clayey-skeletal, mixed, active, thermic Typic Argiustolls
TYPICAL PEDON: Rumple gravelly clay loam--rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 5 inches; dark reddish brown (5YR 3/3) gravelly clay loam, reddish brown (5YR 2/3) moist; moderate fine subangular blocky and granular structure; very hard, firm; many roots; 15 percent angular chert fragments mostly 1/2 to 1 inch in diameter; neutral; clear smooth boundary. (3 to 9 inches thick)
Bt1--5 to 10 inches; dark reddish brown (5YR 3/3) gravelly clay loam, dark reddish brown (5YR 3/3) moist; moderate fine subangular blocky structure; very hard, firm; many roots; few patchy clay films; 25 percent angular chert fragments less than 2 inches in diameter; few chert cobbles; slightly acid; clear wavy boundary. (4 to 7 inches thick)
Bt2--10 to 26 inches; red (2.5YR 4/6) extremely gravelly clay, dark red (2.5YR 3/6) moist; moderate fine angular blocky structure; very hard, firm; common roots; 65 percent chert fragments less than 2 inches in diameter; few chert and limestone cobbles; common thin clay films on peds; slightly acid; abrupt wavy boundary. (10 to 24 inches thick)
R--26 to 46 inches; white and gray indurated limestone, coarsely fractured; red clay in crevices.
TYPE LOCATION: McCulloch County, Texas. About 7 miles southeast of Brady, Texas. From the intersection of U.S. Highways 190 to 377 in Brady, 4.0 miles south of Brady on U.S. Highway 377 to junction with Texas Highway 71, 5.2 miles southeast on Texas Highway 71, 50 feet west of fence in rangeland.
RANGE IN CHARACTERISTICS: Solum thickness and depth to hard limestone ranges from 20 to 40 inches. The mollic epipedon is 7 to 18 inches thick. Coarse fragments are angular to subrounded chert and limestone.
The A horizon has hue of 2.5YR, 5YR or 7.5YR values of 3 to 5, and chroma of 2 or 3. It is loam or clay loam or their gravelly or very gravelly counterparts. It is slightly acid or neutral.
The Bt horizon has hue of 2.5YR or 5YR, value of 3 or 4 and chroma of 3 to 6. Some pedons have chroma of 2 in the Bt1 horizon. It is clay or clay loam averaging 35 to 60 percent clay. Coarse fragments of chert and limestone range from 35 to 75 percent. They are dominantly pebbles and cobbles but includes stones. It is slightly acid to mildly alkaline.
The R layer is indurated or strongly cemented limestone and is dolomitic in some pedons. Chert and quartz fragments are embedded in the limestone in some pedons.
COMPETING SERIES: There are no other series in this family. Similar soils included the Bexar, Brico Georgetown, Naru and Scullin series. Bexar, Georgetown, and Scullin soils contain less than 35 percent coarse fragments. Brico soils have sola more than 40 inches thick over granitic materials. Naru soils have sola more than 40 inches thick over shaley clay.
GEOGRAPHIC SETTING: Rumple soils are on erosional uplands. Slopes range from 1 to 8 percent, but are dominantly 1 to 4 percent. The soils formed in residuum and colluvium weathered from hard limestone. The climate is subhumid. Mean annual precipitation ranges from 24 to 34 inches and mean annual temperature ranges from 63 to 70 degrees F.; Frost free days range from 215 to 230 days and elevation ranges from 1,000 to 2,000 feet. Thornthwaite annual P-E indices range from 36 to 50.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Anhalt, Bexar, Roughcreek, Speck, Tarpley, and Tarrant series. These soils occur on similar surfaces. Anhalt, Bexar, Speck, and Tarpley soils contain less than 35 percent coarse fragments. Roughcreek soils are less than 20 inches thick. Tarrant soils, as well as Tarpley and Speck soils, are less than 20 inches thick over limestone. In addition, Anhalt and Tarpley soils lack Bt horizons.
DRAINAGE AND PERMEABILITY: Well drained. Runoff and internal drainage are medium. Permeability is moderately slow.
USE AND VEGETATION: Used for rangeland. Native vegetation includes sideoats grama, pinhole bluestem, Texas wintergrass, Arizona cottontop, buffalograss, and curlymesquite grass. Woody vegetation includes scattered live oak, post oak, mesquite, land catclaw acacia.
DISTRIBUTION AND EXTENT: Eastern Edwards Plateau and Grand Prairie of Texas; perhaps Oklahoma. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: McCulloch County, Texas; 1970.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon --0 to 10 inches (A and Bt1 horizons)
Argillic horizon --5 to 26 inches (Bt1 and Bt2 horizons)
Lithic contact - Hard Limestone bedrock at 26 inches.