LOCATION FIELDCREEK TXEstablished Series
TAXONOMIC CLASS: Coarse-loamy, mixed, superactive, thermic Cumulic Haplustolls
TYPICAL PEDON: Fieldcreek fine sandy loam, in rangeland. (Colors are for dry soil unless otherwise stated).
A1--0 to 20 cm (0 to 8 in); brown (10YR 4/3) fine sandy loam, dark brown (10YR 3/3) moist; weak fine granular structure; slightly hard, very friable, slightly sticky and slightly plastic; many fine roots; common fine pores; 1 percent, 2 to 75 mm, quartz and feldspar; neutral; clear smooth boundary.
A2--20 to 64 cm (8 to 25 in); dark grayish brown (10YR 4/2) loam, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky and granular structure; slightly hard, friable, slightly sticky and slightly plastic; common fine roots; many fine and few medium pores; few wormcasts; few mica flakes; neutral; gradual smooth boundary. (Combined thickness of the A horizon is 20 to 70 cm [8 to 28 in])
Bw1--64 to 122 cm (25 to 48 in); brown (7.5YR 4/4) loam, dark brown (7.5YR 3/4) moist; weak medium prismatic structure parting to weak fine subangular blocky; slightly hard, friable, sticky and slightly plastic; few fine roots, few dark stains; common mica flakes; slightly effervescent; moderately alkaline; gradual smooth boundary.
Bw2--122 to 203 cm (48 to 80 in); brown (7.5YR 5/4) fine sandy loam, brown (7.5YR 4/4) moist; weak medium prismatic structure parting to weak fine subangular blocky; slightly hard, very friable, slightly sticky and slightly plastic; many mica flakes; 10 percent, 2 to 5 mm, quartz and feldspar; slightly effervescent; moderately alkaline. (Combined thickness of the Bw horizon is 100 to 200 cm [25 to 80 in])
TYPE LOCATION: Llano County, Texas; From the intersection of Texas Highway 16 and Texas Highway 71 in Llano, 8.5 miles southeast on Texas Highway 71, 3.1 miles east on County Road 307; and 150 feet north in rangeland. (Cap Mountain USGS topographic quadrangle; Latitude: 30 degrees, 40 minutes, 40 seconds N; Longitude: 98 degrees, 30 minutes, 36 seconds W.; NAD83)
RANGE IN CHARACTERISTICS:
Solum thickness: greater than 200 cm (80 in)
Particle-size control section (weighted average):
Clay content: 10 to 18 percent
Coarse fragments: 0 to 10 percent by volume; some pedons have thin gravelly strata below a depth of 100 cm (40 in)
A horizon
Hue: 7.5YR or 10YR
Value: 3 to 5, 2 to 4 moist
Chroma: 2 or 3, dry and moist
Texture: Loamy sand, coarse sandy loam, sandy loam, fine sandy loam, or loam
Effervescence: Noneffervescent
Reaction: Slightly acid to moderately alkaline
Bw horizons
Hue: 7.5YR or 10YR
Value: 4 to 6, 3 to 5 moist
Chroma: 4 to 6, dry and moist
Texture: Sandy loam, fine sandy loam, loam, or sandy clay loam, and their gravelly phases
Rock fragments: amount-0 to 20 percent by volume; kind-siliceous, feldspar; size-gravel
Identifiable calcium carbonate: amount-0 to 2 percent by volume; size-fine; kind-masses; location-below a depth of 100 cm (40 in) in some pedons
Effervescence: Noneffervescent to slightly
Reaction: Neutral to moderately alkaline
COMPETING SERIES: These are the
Cyril (OK) series in the same family. Similar soils are the
Bippus (TX),
Bosque (TX),
Gageby (TX),
Gowen (TX),
Oakalla (TX), and
Odem (TX) series.
Bippus, Bosque, Gageby, Gowen, and Oakalla soils: have more than 18 percent clay in their particle-size control section.
Cyril soils: Are slightly to strongly effervescent throughout.
Oakalla soils: Have more than 40 percent by weight carbonates in the control section.
Odem soils: Have mean annual soil temperatures of greater than 22 degrees C (72 degrees F)
GEOGRAPHIC SETTING:
Parent material: Alluvium derived from sedimentary and metamorphic sources
Landscape: River valleys in the Central Basin
Landform: Flood plains and low stream terraces
Slope: 0 to 5 percent
Climate: dry subhumid
Soil moisture: Typic ustic moisture regime
Precipitation Pattern: The majority of the yearly amount occurs during the fall and spring months. The winter and summer months are normally drier.
Mean annual temperature: 18 to 20 degrees C (65 to 68 degrees F)
Mean annual precipitation: 610 to 762 mm (24 to 30 in)
Frost-free period: 215 to 230 days
Elevation: 305 to 580 meters (1,000 to 1,900 ft)
Thornthwaite PE indices: 38 to 44
GEOGRAPHICALLY ASSOCIATED SOILS: These are the similar
Oakalla soils and the
Castell,
Katemcy,
Keese,
Ligon,
Lou,
Nebgen,
Oben, and
Voca soils.
Castell, Katemcy, and Voca soils: have more than 35 percent clay in their particle-size control sections and occur on undulating plains and footslopes of ridges and hills.
Keese, Ligon, Nebgen and Oben soils: Have contact with bedrock at less than 50 cm (20 in) and occur on higher positions on backslopes, shoulders, and summits of ridges and hills.
Oakalla soils: Are in similar positions on flood plains.
DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderately rapid. Runoff is negligible. These soils flood rarely or occasionally for very brief periods, mainly during the spring months.
USE AND VEGETATION: Most areas are used for range, a few areas are used for pecan orchards or improved pasture. Native grasses include indiangrass, little bluestem, switchgrass, Scribner's panicum, and Texas wintergrass. The main tree vegetation consists of pecan, mesquite, elm, hackberry, and Texas persimmon. Greenbriar, prickly ash and hawthorne are common vines and shrubs, and there are a few prickly pear.
DISTRIBUTION AND EXTENT: Central Texas. Southwest Plateaus and Plains Range and Cotton Region, LRR-I, MLRA 82A-Texas Central Basin. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Llano County, Texas; 1985. The name is from a community in Llano County.
REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Mollic epipedon: 0 to 64 cm (0 to 25 in) (A1 and A2 horizons)
Cumulic feature: Mollic epipedon extends to depths greater than 50 cm (20 in) and an irregular decrease in organic carbon between 25 and 125 cm.
Cambic horizon: 64 to 200 cm (25 to 80 in) (Bw horizons)
ADDITIONAL DATA: None
TAXONOMIC VERSION: Keys to Soil Taxonomy, 11th Edition, 2010.