LOCATION TANGLEWOOD TX

Established Series
RMR-RM
09/2018

TANGLEWOOD SERIES

The Tanglewood series consists of very deep, moderately well drained, slowly permeable soils formed in sandy, clayey, and loamy residuum derived from sandstone, claystone and shale. These nearly level to moderately sloping soils occur on ridges of inland dissected coastal plains. Slope ranges from 0 to 8 percent. Mean annual precipitation is about 900 mm (35.4 in), and mean annual air temperature is about 20 degrees C (68 degrees F).

TAXONOMIC CLASS: Clayey, mixed, active, thermic Aquic Arenic Paleustalfs

TYPICAL PEDON: Robco-Tanglewood complex, 1 to 5 percent slope in pasture; elevation is 122 m (400 ft) (Colors are for dry soil unless otherwise stated.)

A--0 to 13 cm (0 to 5 in); brown (10YR 5/3) loamy fine sand, brown (10YR 4/3), moist; 80 percent sand; 16 percent silt; 4 percent clay; structureless single grain; slightly hard, loose; very strongly acid, pH 4.9 by pH meter; clear smooth boundary. (Thickness is 7 to 51 cm [3 to 20 in].)

E--13 to 59 cm, (5 to 23 in); pale brown (10YR 6/3) loamy fine sand, brown (10YR 5/3), moist; 77 percent sand; 18 percent silt; 5 percent clay; structureless single grain; slightly hard, very friable; very strongly acid, pH 5.1 by pH meter; abrupt wavy boundary. (Thickness is 16 to 74 cm [6 to 29 in].)

Btg1--59 to 84 cm, (23 to 33 in); sandy clay loam, 55 percent grayish brown (10YR 5/2) reduced and 35 percent yellowish brown (10YR 5/6) oxidized and 10 percent strong brown (7.5YR 5/6) oxidized, moist; 56 percent sand; 17 percent silt; 27 percent clay; moderate medium subangular blocky structure; hard, firm; 10 percent medium distinct cylindrical brown (7.5YR 5/4), moist, iron-manganese masses throughout; very strongly acid, pH 4.9 by pH meter; gradual wavy boundary. (Combined thickness of the Btg horizons is 20 to 150 cm [8 to 59 in].)

Btg2--84 to 124 cm, (33 to 49 in); clay, 55 percent strong brown (7.5YR 5/6) oxidized and 35 percent light brownish gray (10YR 6/2) reduced and 10 percent yellowish brown (10YR 5/4) oxidized, moist; 42 percent sand; 13 percent silt; 45 percent clay; moderate medium angular blocky structure; very hard, very firm; 10 percent medium distinct cylindrical brown (7.5YR 5/4), moist, iron-manganese masses throughout; very strongly acid, pH 5.0 by pH meter; gradual wavy boundary.

Btg3--124 to 173 cm, (49 to 68 in); sandy clay, 55 percent yellowish brown (10YR 5/6) oxidized and 30 percent grayish brown (10YR 5/2) reduced and 15 percent yellowish brown (10YR 5/4) oxidized, moist; 49 percent sand; 14 percent silt; 37 percent clay; moderate medium angular blocky structure; very hard, very firm; moderately acid, pH 5.8 by pH meter; gradual wavy boundary.

Btg4--173 to 210 cm, (68 to 83 in); sandy clay loam, 60 percent light brownish gray (10YR 6/2) reduced and 25 percent yellowish red (5YR 4/6) oxidized and 15 percent strong brown (7.5YR 5/6) oxidized, moist; 59 percent sand; 11 percent silt; 30 percent clay; moderate medium subangular blocky structure; hard, firm; neutral, pH 7.0 by pH meter.

TYPE LOCATION: Caldwell County, Texas (TX); From the intersection of State Highway 183 and Farm to Market Road 1322 in Luling, Texas; about 4.6 miles East and Northeast on Farm to Market Road 1322; about 1.35 miles East on Farm to Market Road 1386; 1.3 miles South on County Road 137 to a gate; approximately .6 miles Northwest along a property line; located about 668 feet North of property line in pastureland.

USGS topographic quadrangle: Tanglewood, TX
Latitude: 29 degrees, 41 minutes, 27 seconds N
Longitude: 97 degrees, 34 minutes, 28 seconds W

Decimal Degrees
Latitude: 29.6907120
Longitude: -97.5745392
Datum: WGS 84

UTM Easting: 637914 m
UTM Northing: 3285364 m
UTM Zone: 14

RANGE IN CHARACTERISTICS:
Solum depth: 142 cm to greater than 203 cm (56 in to greater than 80 in)
Soil Moisture: aquic ustic soil moisture regime. The soil moisture control section is dry in some or all parts for more than 90 days but less than 150 cumulative days in normal years.
Mean annual soil temperature: 19.4 to 22 degrees C (67 to 71.6 degrees F)
Depth to abrupt textural change: 51 to 83 cm (20 to 33 in)
Depth to albic materials: 8 to 61 cm (3 to 24 in)
Depth to albic horizon: 8 to 61 cm (3 to 24 in)
Depth to argillic horizon: 51 to 87 cm (20 to 34 in)
Depth to aquic conditions: 51 to 68 cm (20 to 27 in)
Depth to redox concentrations: 8 to 66 cm (3 to 26 in)
Depth to redox depletions: 51 to 68 cm (20 to 27 in)
Depth to episaturation: 51 to 68 cm (20 to 27 in)
Thickness of the ochric epipedon: 8 to 87 cm (3 to 34 in)

Particle-size control section (weighted average):
Total clay content: 35 to 60 percent
Silicate clay content: 35 to 60 percent
Sand content: 30 to 65 percent
Rock fragments: 0 to 3 percent
Cation-Exchange Capacity/clay ratio: 0.4 to 0.6

A horizon:
Hue: 10YR
Value: 3 to 4 moist, 3 to 5 dry
Chroma: 2 to 4, dry or moist
Texture: loamy sand, loamy fine sand, or fine sand
Total clay content: 2 to 8 percent
Sand content: 73 to 89 percent
Rock fragments: amount-0 to 5 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemens per meter): 0 to 2
Reaction (pH): Very strongly acid to slightly acid (4.9 to 6.1)

E horizon:
Hue: 10YR
Value: 5 to 6, dry or moist
Chroma: 2 to 4, dry or moist
Texture: loamy sand, loamy fine sand, or fine sand
Total clay content: 3 to 9 percent
Sand content: 73 to 84 percent
Redox concentrations: amount-0 to 15 percent; size-fine or medium; contrast-faint or distinct; color-shades of yellowish brown or strong brown; boundary-clear or diffuse; location-on surfaces along root channels
Iron-manganese concentrations: amount-0 to 2 percent; size-fine; kind-concretions
Rock fragments: amount-0 to 5 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemems per meter): 0 to 2
Reaction (pH): Very strongly acid to slightly acid (4.8 - 6.3)

Btg or Bt horizon (upper part):
Hue: 2.5YR to 10YR
Value: 4 to 6, moist, 4 to 8 dry
Chroma: 1 to 8, dry or moist
Texture: clay, sandy clay, sandy clay loam
Total clay content: 27 to 54 percent
Sand content: 36 to 56 percent
Redox concentrations: amount-2 to 35 percent; size-fine or medium; contrast-faint or distinct; color-shades of red, yellowish red, yellowish brown, or strong brown; boundary-clear or diffuse; location-on surfaces along root channels
Redox depletions: amount-5 to 15 percent; size-fine or medium; contrast-faint or distinct; color-shades of gray or light brownish gray; boundary-clear or diffuse; location-in matrix surrounding redox concentrations
Iron-manganese concentrations: amount-0 to 5 percent; size-fine; kind-concretions
Rock fragments: amount-0 to 3 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemens per meter): 0 to 2
Reaction (pH): Very strongly acid to moderately acid (4.9 - 6)

Btg or Bt horizon (lower part):
Hue: 2.5YR to 10YR
Value: 4 to 6, dry or moist
Chroma: 1 to 8, dry or moist
Texture: clay, clay loam, sandy clay, sandy clay loam
Total clay content: 34 to 54 percent
Sand content: 30 to 54 percent
Redox concentrations: amount-2 to 20 percent; size-fine or medium; contrast-faint or distinct; color-shades of red, yellowish brown, yellowish red, or strong brown; boundary-clear or diffuse; location-on surfaces along root channels
Redox depletions: amount-10 to 25 percent; size-fine or medium; contrast-faint or distinct; color-shades of gray or light brownish gray; boundary-clear or diffuse; location-in matrix surrounding redox concentrations
Iron-manganese concentrations: amount-0 to 5 percent; size-fine; kind-concretions
Rock fragments: amount-0 to 3 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemens per meter): 0 to 2
Reaction (pH): Very strongly acid to slightly alkaline (4.6 - 7.4)

BCt, BCtg, CBtg, CBt horizon(s) (where present):
Hue: 2.5YR to 10YR
Value: 4 to 6, dry or moist
Chroma: 1 to 8, dry or moist
Texture: clay, sandy clay, sandy clay loam, sandy loam
Total clay content: 19 to 45 percent
Sand content: 37 to 77 percent
Redox concentrations: amount-5 to 30 percent; size-fine or medium; contrast-faint or distinct; color-shades of red, yellowish red, or strong brown; boundary-clear or diffuse; location-on surfaces along root channels
Redox depletions: amount-0 to 5 percent; size-fine or medium; contrast-faint or distinct; color-shades of gray or light brownish gray; boundary-clear or diffuse; location-in matrix surrounding redox concentrations
Iron-manganese concentrations: amount-0 to 5 percent; size-fine; kind-concretions
Rock fragments: amount-0 to 3 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemens per meter): 0 to 2
Reaction (pH): Very strongly acid to neutral (4.9 - 7.3)

C horizon (where present):
Hue: 5YR to 10YR
Value: 4 to 6, dry or moist
Chroma: 1 to 8, dry or moist
Texture: clay, sandy clay, sandy clay loam, or sandy loam. Some pedons have stratified layers of sandy loam or clay loam.
Total clay content: 18 to 42 percent
Sand content: 45 to 70 percent
Redox concentrations: amount-0 to 30 percent; size-fine or medium; contrast-faint or distinct; color-shades of red, yellowish red, or strong brown; boundary-clear or diffuse; location-on surfaces along root channels
Redox depletions: amount-0 to 20 percent; size-fine or medium; contrast-faint or distinct; color-shades of gray or light brownish gray; boundary-clear or diffuse; location-in matrix surrounding redox concentrations
Iron-manganese concentrations: amount-; size-; kind-
Rock fragments: amount-0 to 3 percent; size-fine or medium; kind-quartzite
Electrical conductivity (decisiemens per meter): 0 to 2
Reaction (pH): Very strongly acid to neutral (4.5 - 7.0)

COMPETING SERIES:
These are the Demona series in the same family. Similar soils are the Antosa, Coving, Ellen, Garcitas, Nimrod, Rehburg, Robco, and the Tremona series.
Demona soils: have a soil temperature that is 19 to 20 degrees C (66.2 to 68 degrees F), occur where the mean annual precipitation is 610 to 889 mm (24 to 35 in, occur where the mean annual air temperature is 17.2 to 18.9 (63 to 66 degrees F), and are formed in slope alluvium and residuum of Cretaceous age. Additionally, these soils are less acidic in the A and E horizons.
Antosa soils: have a loamy particle size control section, have siliceous mineralogy, and occur in a hyperthermic soil temperature regime
Coving soils: have a loamy particle size control section, have siliceous mineralogy, and have a superactive cation exchange capacity activity class
Ellen soils: have a loamy-skeletal particle size control section and have siliceous mineralogy
Garcitas soils: occur in a hyperthermic soil temperature regime and do not have red argillic horizons
Nimrod and Robco soils: have a loamy particle size control section and siliceous mineralogy
Rehburg soils: are 102 to 152 cm (40 to 60 in) deep to paralithic contact and have a loamy particle size control section
Tremona soils: occur in a hyperthermic soil temperature regime and do not have red argillic horizons

GEOGRAPHIC SETTING:
Parent material: sandy, clayey, and loamy residuum derived from sandstone, claystone and shale of Eocene Age mainly of the Wilcox, Reklaw, Queen City, and Sparta formations
Landscape: Inland dissected coastal plains
Landform: footslopes and toeslopes on baseslopes on broad ridges; backslopes on sideslopes on broad ridges
Slope: 0 to 8 percent
Mean annual precipitation: 891 to 1153 mm (35 to 45.4 in)
Mean annual air temperature: 19.4 to 20.6 degrees C (67 to 69 degrees F)
Frost-free period: 250 to 280 days
Elevation: 66.3 to 186 m (217.5 to 610 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Arenosa, Padina, Robco, Rosanky, and Silstid series.
Arenosa soils: have a sandy epipedon greater than 203 cm (80 in) thick and occur on convex summits
Padina soils: have a sandy epipedon 100 to 183 cm (40 to 72 in) thick, have a loamy particle size control section, and occur on convex summits and shoulders
Robco soils: have loamy particle size control sections and occur on similar positions
Rosanky soils: have fine particle size control sections, have a base saturation of less than 75 percent throughout the argillic horizon, and occur on convex summits and shoulders of ridges
Silstid soils: have a sandy epipedon 50 to 100 cm (20 to 40 in) thick, have a loamy particle size control section, and occur on sideslopes

DRAINAGE AND PERMEABILITY:
Drainage class: Moderately well
Permeability class: Slow
Runoff: low on less than 1 percent slopes, medium on 1 to 5 percent slopes, and high on 5 to 8 percent slopes
Seasonal water table: Episaturation usually occurs above or near the top of the argillic horizon between depths of 46 to 122 cm (18 to 48 in) of the surface during the months of January to April in most years.

USE AND VEGETATION:
These soils are used mainly for pasture and rangeland. Pastures are improved bermudagrass or native grasses. Tree species are mainly post oak and blackjack oak with an understory of yaupon, grasses, and other shrubs.

DISTRIBUTION AND EXTENT:
General area: South Central Texas
Land Resource Region: J-Southwestern Prairies Cotton and Forage Region
Major Land Resource Area 87A - Texas Claypan Area, Southern Part
Extent: Moderate

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

SERIES PROPOSED: Caldwell County, Texas, 2017, Caldwell County soil survey area, Texas, 2017. The name is from a community near the type location.

REMARKS: The series was formerly included in the Demona series. The series was separated based on having a warmer soil temperature, having a wetter mean annual precipitation range, having a warmer mean annual air temperature range, occurrence in a different major land resource area, and different geologic material.

Diagnostic horizons and features recognized in this pedon are:

Particle-size control section: 59 to 109 cm (23 to 43 in)
Ochric epipedon: 0 to 13 cm (0 to 5 in) (A horizon)
Argillic horizon: 59 to 210 cm (23 to 83 in) (Btg1, Btg2, Btg3, Btg4 horizons)
Redoximorphic concentrations: 59 to 210 cm (23 to 83 in) (Btg1, Btg2, Btg3, Btg4 horizons)
Redoximorphic depletions: 59 to 210 cm (23 to 83 in) (Btg1, Btg2, Btg3, Btg4 horizons)
Episaturation: 59 to 210 cm (23 to 83 in) (Btg1, Btg2, Btg3, Btg4 horizons)
Aquic conditions: 59 to 210 cm (23 to 83 in) (Btg1, Btg2, Btg3, Btg4 horizons)
Reduced matrix: 59 to 210 cm (23 to 83 in)
Abrupt textural change: 59 cm (23 in) (E to Btg1 horizon)

Additional Comments:

The assignment of the cation-exchange activity class is inferred from lab data from S09TX1870016 from Guadalupe County, Texas. This lab data is from a Robco pedon taken in a Demona mapunit.

ADDITIONAL DATA: TAMU Data from Williamson County, Texas taxonomic unit pedon S78TX-491-003. Particle-size analysis, salinity and sodicity tests were performed at the project office on 12 pedons.

Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014

National Cooperative Soil Survey
U.S.A.