LOCATION CLICK TXEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, semiactive, thermic Typic Haplustalfs
TYPICAL PEDON: Click very gravelly coarse sandy loam--rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 11 inches; brown (7.5YR 5/4) very gravelly coarse sandy loam, dark brown (7.5YR 4/4) moist; weak medium subangular blocky structure; slightly hard, very friable; many fine, common medium and few coarse roots; many fine and few coarse discontinuous tubular pores; about 40 percent angular quartz and feldspar fragments 2 to 5 mm in diameter; slightly acid; clear wavy boundary. (8 to 15 inches thick)
Bt1--11 to 18 inches; yellowish red (5YR 5/6) very gravelly coarse sandy loam, yellowish red (5YR 4/6) moist; weak medium subangular blocky structure; slightly hard, very friable; common fine and medium roots; common fine and few coarse discontinuous tubular pores; about 45 percent angular quartz and feldspar fragments 2 to 5 mm in diameter; slightly acid; clear smooth boundary. (4 to 15 inches thick)
Bt2--18 to 29 inches; red (2.5YR 5/6) very gravelly sandy clay loam, red (2.5YR 4/6) moist; weak coarse subangular blocky structure parting to weak medium subangular blocky; slightly hard, very friable; few fine and medium roots; few fine and coarse discontinuous tubular pores; patchy clay films with clay bridging sand grains; about 55 percent angular quartz and feldspar fragments 2 to 10 mm in diameter; neutral; clear wavy boundary. (8 to 14 inches thick)
Bt3--29 to 46 inches; light red (2.5YR 6/8) very gravelly coarse sandy loam, red (2.5YR 5/8) moist; brown (10YR 4/3) coating on prism faces; weak very coarse prismatic structure parting to weak coarse subangular blocky; hard, firm; few fine and medium roots; few fine and medium discontinuous tubular pores; distinct clay films on prism faces in root channels and on fragments; about 60 percent angular quartz and feldspar fragments 2 to 10 mm in diameter; common mica flakes; neutral; abrupt smooth boundary. (0 to 20 inches thick)
Cr--46 to 53 inches; red (2.5YR 5/8) finely fragmented granite grus; structure controlled by angular rock fragments; few fine roots about 2 to 3 feet apart; fragments coated with thin red clay in horizontal and vertical fractures; neutral; abrupt smooth boundary. (6 to 80 inches thick)
R--53 to 56 inches; pink indurated and fractured granite.
TYPE LOCATION: Llano County, Texas; from intersection of Texas Highway 16 and Ranch Road 2323 in Llano, 23.7 miles southwest on Ranch Road 2323, 0.3 mile west on county road, 3.9 miles northwest on county road, 100 feet south in rangeland.
RANGE IN CHARACTERISTICS: Solum thickness to fractured granite containing less than 5 percent fine earth ranges from 40 to 60 inches. Reaction ranges from slightly acid to neutral throughout.
The A horizon has hue of 10YR or 7.5YR, value of 4 to 7, and chroma of 3 or 4. It is very gravelly coarse sandy loam, gravelly coarse sandy loam or gravelly loamy coarse sand. Coarse and very coarse sand comprises 40 to 60 percent of the sand fraction. Feldspar and quartz fragments 2 to 15 mm in diameter comprise 20 to 35 percent by volume.
The Bt horizons have hue of 2.5YR, 5YR or 7.5YR, value of 4 to 6, and chroma of 4 to 8. It is gravelly sandy loam, very gravelly sandy loam, gravelly sandy clay loam, or very gravelly sandy clay loam with clay of 12 to 21 percent in the fine earth fraction. Weighted average of Feldspar and quartz fragments 2 to 20 mm in diameter range from 35 to 60 percent. Reaction is moderately acid to slightly acid.
The Cr horizon consists of fractured weathered granite saprolite; the upper few inches has clay coatings on fragments.
The R layer is crystalline granite that is fractured and contains 0 to 5 percent streaks and masses of clayey earth.
COMPETING SERIES: There are no series in the same family. Similar soils are the Castell, Lou, and Voca series. Castell and Voca soils are in a fine family and contain less than 35 percent coarse fragments. Lou soils contain 18 to 35 percent clay in the fine earth fraction, 15 to 35 percent coarse fragments in the control section, and the soil is 20 to 40 inches over fractured granite.
GEOGRAPHIC SETTING: These soils occur on undulating uplands. Slope gradients range from 1 to 8 percent but are mostly 1 to 5 percent. Occasional granite boulders or outcrops are present. These soils formed in fractured granite. Mean annual precipitation ranges from 25 to 30 inches, and mean annual air temperature from 65 to 68 degrees F. Frost free days range from 210 to 240 days, and elevation ranges from 800 to 2,250 feet. Thornthwaite annual P-E index ranges from 38 to 44.
GEOGRAPHICALLY ASSOCIATED SOILS: These include the Bauman, Keese, Lou, and Voca series. Bauman soils are in lower concave positions and have a natric horizon. Keese soils are on higher sideslopes and ridges. Lou soils are on similar positions. Voca soils are on similar and slightly lower positions.
DRAINAGE AND PERMEABILITY: Somewhat excessively drained. Permeability is rapid. Runoff is negligible on slopes less than 3 percent, very low on 3 to 5 percent slopes, and low on 5 to 8 percent slopes.
USE AND VEGETATION: Rangeland. Grasses are mostly purple threeawn, red threeawn, and sand dropseed. Woody vegetation consists of tasajillo, yucca, whitebrush, Texas persimmon, and live oak and a few large post oak, and blackjack oak. On disturbed areas, clubmoss is the dominant ground cover.
DISTRIBUTION AND EXTENT: Central Texas, mainly in the Central Basin. The series is of moderate extent.
MLRA OFFICE RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Gillespie County, Texas; 1970.
REMARKS: Diagnostic horizons or features recognized in this pedon are:
Ochric epipedon - 0 to 11 inches. (A horizon)
Argillic horizon - 11 to 46 inches. (Bt horizon)
Paralithic contact at 46 inches.
Lithic contact - at 53 inches.
ADDITIONAL DATA: Goss, Don W.; 1964. A Study of the Mineral Transformation and Weathering Processes Occurring During the Genesis of Two Soils Developed in Llano County, Texas. MS Thesis, Texas Tech University, Lubbock, Texas.