LOCATION GARVEN                  TX

Established Series
AKN-THW-RM
03/2018

GARVEN SERIES

The Garven series consists of shallow, well drained, moderately slow permeable soils formed in residuum derived from limestone of the Buda Formation. These nearly level soils occur on shoulders and summits of interfluves on ridges of dissected plateaus. Slope ranges from 0 to 3 percent. Mean annual precipitation is about 762 mm (30 in), and mean annual air temperature is about 18.3 degrees C (65 degrees F).

TAXONOMIC CLASS: Clayey, smectitic, thermic, shallow Entic Haplustolls

TYPICAL PEDON: Garven clay, 1 percent slope in rangeland; elevation is 725 m (2379 ft) (Colors are for dry soil unless otherwise stated.)

A--0 to 10 cm (0 to 4 in); clay, very dark brown (10YR 2/2), moist; weak medium subangular blocky structure parting to moderate fine subangular blocky; moderately hard, firm, very sticky, very plastic; common fine roots throughout; 5 percent nonflat subangular indurated 2 to 75-mm limestone fragments; slightly alkaline; clear smooth boundary. (Thickness is 7 to 20 cm [3 to 8 in].)

Bw--10 to 33 cm (4 to 13 in); clay, very dark grayish brown (10YR 3/2), moist; moderate medium subangular blocky structure; moderately hard, firm, very sticky, very plastic; common very fine roots throughout and common fine roots throughout; slightly alkaline; abrupt smooth boundary. (Thickness is 13 to 41 cm [5 to 16 in].)

Cr--33 to 100 cm (13 to 40 in); moderately cemented paralithic limestone; moderately alkaline

TYPE LOCATION: Kerr County, TX; from the intersection of Interstate 10 and State Highway 41 about 23.4 miles southwest on State Highway 41 to private ranch road; 1 mile southwest on private ranch road; 0.2 miles southwest in rangeland.

USGS topographic quadrangle: Garven Store, Texas;
Latitude: 30 degrees, 3 minutes, 6.52 seconds N;
Longitude: 99 degrees, 40 minutes, 58.58 seconds W;
Datum: WGS84.

Decimal Degrees
Latitude: 30.0518111
Longitude: -99.6829389
Datum: WGS84.

UTM Easting 434165.48 m,
UTM Northing 3324722.95 m,
UTM Zone 14.

RANGE IN CHARACTERISTICS:
Soil Moisture: Typic ustic soil moisture regime.

Depth to paralithic contact: 20 to 50 cm (8 to 20 in)
Thickness of the mollic epipedon: 20 to 50 cm (8 to 20 in)
Surface fragments: 0 to 30 percent; 0 to 20 percent gravels and 0 to 10 percent cobbles; limestone

Particle-size control section (weighted average)
Clay content: 40 to 60 percent
Rock fragments: 0 to 25 percent

A Horizon
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 2
Texture: clay loam or clay and their gravelly phases
Clay content: 37 to 60 percent
Rock fragments: 0 to 25 percent by volume total; 0 to 15 percent gravel, 0 to 10 percent cobbles; limestone
Electrical conductivity (dS/m): 0 to 2
Effervescence: None to strong
Reaction (pH): Neutral to moderately alkaline (6.8 to 8.2)

Bw Horizon
Hue: 7.5YR or 10YR
Value: 2 to 3
Chroma: 1 to 3
Texture: clay and its gravelly or cobbly phase
Clay content: 40 to 60 percent
Rock fragments: 0 to 25 percent by volume total; 0 to 10 percent gravel, 0 to 15 percent cobbles; limestone
Electrical conductivity (dS/m): 0 to 2
Effervescence: None to strong
Reaction (pH): Neutral to moderately alkaline (6.8 to 8.2)

Cr Horizon
Weakly to moderately cemented limestone
Effervescence: strong to violent
Reaction (pH): moderately alkaline

COMPETING SERIES: There are no soils in the same family. Similar soils are the Castephen and Hillco series.
Castephen soils: have a loamy particle size control section and carbonatic mineraology
Hillco soils: are moderately deep, have a fine-loamy particle size control section, and carbonatic minerology

GEOGRAPHIC SETTING:
Parent material: residuum derived from limestone
Landscape: dissected plateau
Landform: ridges
Slope: 0 to 3 percent
Mean annual precipitation: 711 to 813 mm (28 to 32 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: 17.8 to 19.4 degrees C (64 to 67 degrees F)
Frost-free period: 220 to 240 days
Elevation: 701 to 723.9 m (2300 to 2375 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Eckrant, Harper, and Tarpley soils, which all occur on shoulders and sideslopes below the Garven soils.
Eckrant soils: are skeletal and have a lithic contact within 51 cm (20 in).
Harper soils: have a lithic contact within 51 cm (20 in).
Tarpley soils: have an argillic horizon and have a lithic contact within 51 cm (20 in).

DRAINAGE AND PERMEABILITY:
Drainage class: Well.
Permeability class: moderately slow.
Runoff: low on slopes less than 1 percent and medium on 1 to 3 percent slopes.

USE AND VEGETATION: Used for livestock grazing and wildlife habitat. Native vegetation consists of big and little bluestems, indiangrass, sideoats and tall gramas, cane bluestem, plains lovegrass, Texas cupgrass, maximilian sunflower, bushsunflower, engelmanndaisy, orange zexmenia, daleas, gayfeather, sundrops, penstemon, heath aster, prairieclover, prairie bluets, and bundleflower, with scattered live 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 named Garven Store, Texas.

REMARKS: The series was formerly included in the Purves and Prade series. The series was separated based on having paralithic contact.

Diagnostic horizons and features recognized in this pedon are:

Particle size control section: 0 to 33 cm (0 to 13 in). (A and Bw horizons)
Mollic epipedon: 10 to 33 cm (4 to 13 in). (A and Bw horizons)
Paralithic contact: contact at 33 cm (13 in). (Cr horizon)

ADDITIONAL DATA: None

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

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National Cooperative Soil Survey
U.S.A.