LOCATION ANSON TXEstablished Series
TAXONOMIC CLASS: Loamy, siliceous, active, thermic Arenic Paleustalfs
TYPICAL PEDON: Anson sand - in rangeland. (Colors are for dry soil unless otherwise stated.)
A--0 to 13 inches; light yellowish brown (10YR 6/4) sand, yellowish brown (10YR 5/4) moist; weak fine granular structure; soft, very friable; common fine and medium roots; neutral; clear smooth boundary.(6 to 29 inches.)
E--13 to 24 inches; pink (7.5YR 7/4) sand, light brown (7.5YR 6/4) moist; weak fine granular structure; soft, very friable; common fine and medium roots; slightly acid; clear wavy boundary. (0 to 30 inches)
Bt1--24 to 32 inches; reddish yellow (7.5YR 6/6) sandy clay loam, strong brown (7.5YR 5/6) moist; weak medium prismatic structure parting to moderate medium subangular blocky; hard, firm; few fine roots; many prominent clay films on ped surfaces; common medium distinct light brownish gray (10YR 6/2); common coarse distinct brownish yellow (10YR 6/6); pale brown (10YR 6/3) and common coarse prominent red (2.5YR 5/6) masses of iron accumulation; slightly alkaline; gradual wavy boundary.
Bt2--32 to 48 inches; mottled 30 percent yellowish red (5YR 5/6), 30 percent reddish yellow (7.5YR 6/6), 30 percent light brownish gray (10YR 6/2), and 10 percent brownish yellow (10YR 6/6) sandy clay loam; weak medium prismatic structure parting to moderate medium subangular blocky; hard, firm; few fine roots; thick continuous clay films on ped surfaces; areas of red and reddish yellow colors are masses of iron accumulation and areas of gray color are iron depletions; slightly alkaline; gradual smooth boundary. (combined thickness of the Bt horizon is 15 to 45 inches.)
2Bt--48 to 80 inches; mottled 30 percent red (2.5YR 5/8), 25 percent reddish yellow (5YR 6/8), 25 percent pale yellow (2.5Y 8/2), 10 percent light brownish gray (10YR 6/2), and 10 percent brownish yellow (10YR 6/6) sandy clay loam; weak medium prismatic structure parting to moderate medium subangular blocky; hard, firm; thick continuous clay films on ped surfaces; few iron-manganese concretions; neutral.
TYPE LOCATION: Jones County, Texas; From the courthouse in Anson, 5.6 miles south on US highway 83-277, 3.1 miles east and 1.0 mile south on Farm Road 3326, 1.2 miles east on Farm Road 3368, and 150 feet north in idle cropland. (Latitude 32 degrees, 41 minutes, 51 seconds N; Longitude 99 degrees, 47 minutes, 13 seconds W.) Hawley NE USGS topographic quadrangle, NAD 1927.
RANGE IN CHARACTERISTICS:
Soil Moisture: An ustic soil moisture regime. The soil moisture control section is dry in some or all parts for more than 90 but less than 160 days, cumulative, in normal years. June through August and December through February are the driest months. These soils are intermittently moist in September through November and March through May.
Mean annual soil temperature: 62 to 64 degrees F.
Depth to argillic horizon: 20 to 40 inches
Depth to redox concentrations and/or depletions: 20 to 40 inches corresponding to the depth of the argillic horizon.
Depth to episaturation: 45 to 70 inches. The period of saturation is insufficient to produce aquic conditions for more than two weeks in normal years.
Particle-size control section (weighted average)
Clay content: 18 to 35 percent
Coarse Fragments: 0 to 2 percent
CEC/clay ratio: 0.40 to 0.55
A Horizon
Hue: 7.5YR or 10YR
Value: 4 to 7
Chroma: 3 or 4.
(The E horizon is typically 1 to 3 units of value greater than the A horizon.)
Texture: sand, fine sand, loamy sand
Clay content: 1 to 8 percent
Base saturation: 75 to 100 percent
EC (dS/m): 0 to 2
Effervescence: none
Reaction: slightly acid to slightly alkaline
Bt1 Horizon
Hue: 5YR to 10YR
Value: 5 to 7
Chroma: 2 to 6
Texture: sandy clay loam
Clay content: 20 to 35 percent
Clay films: few to common on ped surfaces, faint to distinct
Redox accumulations: common to many, fine to coarse, diffuse to sharp boundaries, on ped surfaces.
Redox depletions: few to many, fine to coarse, diffuse boundaries, on ped surfaces.
Coarse fragments: 0 to 2 percent
Base saturation: 80 to 100 percent
Calcium carbonate equivalent: 0 to 2 percent
EC (dS/m): 0 to 2
Effervescence: none
Reaction: slightly acid to slightly alkaline
Bt2 Horizon
Hue: 5YR to 10YR
Value: 5 to 8
Chroma: 2 to 6
Texture: sandy loam, fine sandy loam, sandy clay loam.
Clay content: 12 to 30 percent
Clay films: few to common on ped surfaces, distinct to prominent.
Redox accumulations: common to many, fine to coarse, diffuse to sharp boundaries, on ped surfaces.
Redox depletions: few to many, fine to coarse, diffuse boundaries, on ped surfaces.
There are clean sand grains on ped surfaces and lining pores that are associated with a fluctuating water table. Areas of stipping constitute 5 to 15 percent by volume of ped surfaces.
Coarse fragments: 0 to 2 percent.
Base saturation: 80 to 100 percent.
Calcium carbonate equivalent: 0 to 2 percent.
EC (dS/m): 0 to 2 percent
Effervescence: none
Reaction: slightly acid to slightly alkaline
2Bt Horizon
Hue: 2.5YR to 2.5Y
Value: 4 to 8
Chroma: 2 to 8
Texture: sandy clay loam, sandy clay
Clay content: 20 to 40 percent
Clay films: ped surfaces and lining pores, faint to prominent
The matrix consists of a mixture of colors reflecting various levels of iron accumulation and past iron reduction. Redoximorphic accumulations are mainly on ped surfaces and areas of past reduction occur in ped interiors.
Coarse fragments: 0 to 2 percent
Base saturation: 75 to 100 percent
Calcium carbonate equivalent: 0 to 3 percent.
EC (dS/m): 0 to 2 percent
Effervescence: none to slightly effervescent
Reaction: slightly acid to moderately alkaline
COMPETING SERIES: This is the Styx (TX) series. Soils that may also be competing if activity class were known and asigned are Heaton (TX) and Loneoak (TX) series. Similar soils are the Nimrod and Silstid series.
Styx soils: are moist in the soil moisture control section for longer periods.
Heaton soils: do not have iron depletions in the subsoil.
Loneoak soils: have a paralithic contact with sandstone within 40 to 60 inches of the surface.
Nimrod and
Silstid soils: are moist in the soil moisture control section for longer periods. In addition, Nimrod soils have moderately acid and strongly acid subsoils, and Silstid soils are in the semiactive cation exchange activity class.
GEOGRAPHIC SETTING:
Parent material: Pleistocene terrace sediments overlain by sandy deposits that have been deposited by wind.
Landform: Nearly level to very gently sloping plane to slightly concave stream terraces.
Slope: 0 to 3 percent
Mean annual air temperature range: 62 to 65 degrees F.
Mean annual precipitation range: 22 to 26 inches
Frost-free period: 220 to 225 days
Elevation: 1,350 to 1,800 feet
Thornthwaite annual P-E indices: 33 to 38
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Delwin, Miles, and Winters series.
Delwin, Miles, and Winters soils: have surfaces horizons that are less than 20 inches, and do not have redoximorphic features. These soils are in positions lower in the landscape.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is very rapid to rapid over a moderately slowly permeable subsoil. Runoff is negligible on slopes less than 1 percent and very low on 1 to 3 percent slopes.
USE AND VEGETATION: Used mostly as rangeland, but some areas are cropped to peanuts and melons. Native vegetation is a thick overstory of post oak and blackjack oak with a understory of mid and tall grasses and briars.
DISTRIBUTION AND EXTENT: North Central Texas in the Central Rolling plains (MLRA 78C, 78D). The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Throckmorton County, Texas; 1997.
REMARKS: This soil was formerly included with the Nimrod series. They are separated based on soil moisture control section (typic/ustic vs. udic/ustic), and reaction of the subsoil.
Diagnostic horizons and features recognized in this pedon are:
Particle size control section: 24 to 44 inches. (Bt1 and Bt2 horizons)
Ochric epipedon: 0 to 24 inches. (A and E horizons)
Argillic horizon: 24 to 80 inches. (Bt and 2Bt horizons)
Pale feature: clay content does not decrease from the maximum clay content by as much as 20 percent within 60 inches of the surface.
Redoximorphic concentrations and depletions: 24 to 80 inches, corresponding to the argillic horizon.
The assignment of the cation-exchange activity class is inferred from lab data from similar soils in geographically associated areas.
Taxonomic version: Soil Taxonomy, Second Edition, 1999