LOCATION NOXVILLE                TX

Established Series
THW-AKN-RM
03/2018

NOXVILLE SERIES

The Noxville series consists of shallow, well drained, moderately slowly permeable soils formed in residuum derived from limestone. These gently sloping soils occur on interfluves of ridges on dissected plateaus. Slope ranges from 0 to 5 percent. Mean annual precipitation is about 737 mm (29 in), and mean annual air temperature is about 17.8 degrees C (64 degrees F).

TAXONOMIC CLASS: Clayey, smectitic, thermic, shallow Petrocalcic Paleustolls

TYPICAL PEDON: Noxville clay, 2 percent slope in rangeland; elevation is 680 m (2231 ft) (Colors are for dry soil unless otherwise stated.)

A--0 to 13 cm, (0 to 5 in); very dark gray (7.5YR 3/1) clay, black (7.5YR 2.5/1), moist; moderate medium granular structure; moderately hard, friable, moderately sticky, moderately plastic; common very fine roots throughout and common fine roots throughout; 2 percent nonflat subangular moderately cemented 2 to 75 mm petrocalcic fragments; neutral; clear smooth boundary. (Thickness is 5 to 30 cm [2 to 12 in]).

Bw--13 to 30 cm, (5 to 12 in); dark gray (7.5YR 4/1) gravelly clay, very dark gray (7.5YR 3/1), moist; moderate medium subangular blocky structure; moderately hard, friable, moderately sticky, moderately plastic; common very fine roots throughout and common fine roots throughout; 16 percent nonflat subangular moderately cemented 2 to 75 mm petrocalcic fragments; neutral; abrupt smooth boundary. (Thickness is 12 to 36 cm [5 to 14 in]).

Bkkm--30 to 100 cm, (12 to 39 in); white (10YR 8/1) cemented material, light gray (10YR 7/2), moist; very strongly cemented; strong effervescence; moderately alkaline, 5-6 mm indurated cap

TYPE LOCATION: Kerr County, TX; From the intersection of Interstate 10 and Texas State Highway 16 in Kerrville, about 30.8 miles northwest on Interstate 10; 2.1 miles east on US Highway 290 to ranch entrance; follow ranch road south and east for 2.1 miles; located about 120 feet south in rangeland.

USGS topographic quadrangle: Old Noxville, Texas
Latitude: 30 degrees, 16 minutes, 31.7 seconds N
Longitude: 99 degrees, 28 minutes, 34.4 seconds W

Decimal Degrees
Latitude: 30.2754726
Longitude: -99.4762344
Datum: WGS84.

UTM Easting: 454195.36 m
UTM Northing: 3349406.64 m
UTM Zone: 14

RANGE IN CHARACTERISTICS:
The surface is covered by about 5 percent petrocalcic fragments 2 to 75 mm (1/8 to 3 in) in diameter.

Soil Moisture: Typic ustic soil moisture regime.
Depth to petrocalcic horizon: 12 to 50 cm (5 to 20 in)
Thickness of the mollic epipedon: 12 to 50 cm (5 to 20 in)

Particle-size control section (weighted average)
Clay content: 35 to 60 percent
Rock fragments: 0 to 25 percent

A Horizon
Hue: 7.5YR or 10YR
Value: 2 to 4, 2 or 3 moist
Chroma: 1 or 2 dry or moist
Texture: clay loam or clay and their gravelly counterparts
Clay content: 35 to 56 percent
Rock fragments: 0 to 25 percent, by volume, total; 0 to 20 percent gravels and 0 to 10 percent cobbles; Petrocalcic or limestone fragments
Calcium carbonate equivalent: 0 to 30 percent
Electrical conductivity (dS/m): 0 to 2
Effervescence: none
Reaction (pH): neutral or slightly alkaline (6.6 to 7.8)

Bw Horizon
Hue: 7.5YR or 10YR
Value: 2 to 4, 2 or 3 moist
Chroma: 1 or 2 dry or moist
Texture: clay loam or clay and their gravelly counterparts
Clay content: 39 to 60 percent
Rock fragments: 0 to 30 percent, by volume, total; 0 to 30 percent gravels and 0 to 10 percent cobbles; Petrocalcic or limestone fragments
Calcium carbonate equivalent: 0 to 30 percent
Electrical conductivity (dS/m): 0 to 2
Effervescence: none to slight
Reaction (pH): neutral or slightly alkaline (6.6 to 7.8)

Bkkm Horizon
Hue: 7.5YR or 10YR
Value: 7 to 9 dry or moist
Chroma: 1 to 3 dry or moist
Calcium carbonate equivalent: 40 to 80 percent
Effervescence: strong to violent
Reaction (pH): slightly alkaline to moderately alkaline (7.6 to 8.4)

COMPETING SERIES: These are the Evant series in the same family. Similar soils are the Gruene, Prade, and Slaughter series.
Evant soils: have an argillic horizon
Gruene soils: have a mixed mineralogy and occurs on old stream terraces underlain with gravels
Prade soils: have a clayey-skeletal particle size control section and free carbonates to the surface
Slaughter soils: have an argillic horizon, mixed mineralogy, and is drier in the moisture control section

GEOGRAPHIC SETTING:
Parent material: residuum derived from limestone
Landscape: dissected plateaus
Landform: ridge
Slope: 0 to 5 percent
Mean annual precipitation: 660 to 864 mm (26 to 34 in)
Precipitation Pattern: Bimodal rainfall with May, June, September, and October being the wettest months.
Thornthwaite P-E Index: 35 to 45
Mean annual air temperature: 17.2 to 19.4 degrees C (63 to 67 degrees F)
Frost-free period: 220 to 240 days
Elevation: 594.4 to 708.7 m (1950 to 2325 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bonedraw (T-TX), Harper, Mudgedraw (T-TX), and Prade series.
Bonedraw soils: occur in the drains and are deep with a clayey-skeletal particle size control section
Harper and Prade soils: have a lithic contact within 51 cm (20 in)
Mudgedraw soils: occur on small terraces along the drains and are deep soils with an argillic horizon.

DRAINAGE AND PERMEABILITY:
Drainage class: Well
Permeability class: moderately slow to slow.
Runoff: low on 0 to 1 percent slopes and medium on 1 to 5 percent slopes

USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Native vegetation consists of little bluestem, yellow indiangrass, sideoats grama, plains lovegrass, texas cupgrass, hairy grama, slim tridens, Texas wintergrass, Wright's threeawn, live oak, Ashe's juniper, and white shin oak.

DISTRIBUTION AND EXTENT: TX; Land Resource Region I - Southwest Plateaus and Plains Range and Cotton Region; MLRA 81B; the series is of small extent.

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

SERIES ESTABLISHED: Kerr County, Texas, 2017, Kerr County soil survey area, Texas, 2017. The name is from an USGS topographic quadrangle name Old Noxville, Texas.

REMARKS: The series was formerly included in the Purves series. The series was separated based on the presence of a petrocalcic horizon.

Diagnostic horizons and features recognized in this pedon are:

Particle size control section: 0 to 31 cm (0 to 12 in) (A and Bw horizons)
Mollic epipedon: 0 to 31 cm (0 to 12 in). (A and Bw horizons)
Petrocalcic horizon: 31 to 100 cm (12 to 40 in). (Bkkm horizon)

ADDITIONAL DATA: None

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

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National Cooperative Soil Survey
U.S.A.