LOCATION KATEMCY TX

Established Series
Rev. WHD-ACT-GLL-ALB
04/2011

KATEMCY SERIES

The Katemcy series consists of moderately deep, well drained soils that formed in slope alluvium over schist. These gently sloping to moderately sloping soils are on undulating plains on dissected plateaus. Slope are 1 to 8 percent. Mean annual air temperature is about 19 degrees C (66 degrees F), and mean annual precipitation is about 711 mm (28 in).

TAXONOMIC CLASS: Fine, mixed, superactive, thermic Typic Haplustalfs

TYPICAL PEDON: Katemcy sandy loam, in rangeland. (Colors are for dry soil unless otherwise noted.)

A1--0 to 8 cm (0 to 3 in); reddish brown (5YR 5/3) sandy loam, reddish brown (5YR 4/3) moist; weak coarse platy structure; very hard and massive when dry, very friable; many fine and few coarse roots; common fine and medium tubular pores; 2 percent, 2 to 75 mm, quartz gravel, non-flat, angular; neutral; clear smooth boundary.

A2--8 to 23 cm (3 to 9 in); reddish brown (5YR 5/3) sandy loam, dark reddish brown (5YR 3/3) moist; weak coarse subangular blocky structure; very hard and massive when dry, very friable; many fine and few coarse roots; common fine and medium tubular pores; 2 percent, 2 to 75 mm, quartz gravel, non-flat, angular; neutral; abrupt smooth boundary. (Combined thickness of the A horizon is 20 to 38 cm [8 to 15 in])

Bt1--23 to 28 cm (9 to 11 in); reddish brown (5YR 5/3) sandy clay loam, dark reddish brown (5YR 3/3) moist; weak coarse subangular blocky structure; very hard, firm; common fine and few coarse roots; common fine and medium tubular pores; 25 percent clay films on faces of peds and lining pores; 5 percent, 2 to 75 mm, quartz gravel, non-flat, angular; neutral; clear smooth boundary.

Bt2--28 to 51 cm (11 to 20 in); red (2.5YR 4/6) sandy clay, dark red (2.5YR 3/6) moist; moderate medium prismatic structure parting to moderate medium subangular blocky; very hard, very firm; common fine and few coarse roots; few fine tubular pores; 40 percent distinct clay films on vertical and horizontal ped faces; 10 percent, 2 to 75 mm, quartz and schist gravel, non-flat, angular; 2 percent, 76 to 200 mm, schist cobbles; neutral; gradual smooth boundary.

Bt3--51 to 69 cm (20 to 27 in); reddish brown (2.5YR 5/4) gravelly sandy clay, reddish brown (2.5YR 4/4) moist; moderate medium and coarse prismatic structure parting to weak medium subangular blocky; very hard, very firm; few fine and coarse roots; few fine and medium tubular pores; 40 percent clay films on vertical and horizontal faces of peds; 5 percent, 2 to 40 mm, quartz and schist gravel, non-flat, angular; neutral; abrupt irregular boundary. (Combined thickness of the Bt horizon is 28 to 107 cm (11 to 42 in])

BCt--69 to 97 cm (27 to 38 in); reddish brown (2.5YR 5/4) channery sandy clay loam, reddish brown (2.5YR 4/4) moist; weak medium subangular blocky structure; very hard, firm; few fine and few coarse roots; few fine and medium tubular pores; 5 percent distinct clay films on vertical and horizontal faces of peds; 20 percent, 76 to 100 mm, schist channers, flat, angular; neutral; clear wavy boundary. (Thickness of the BCt horizon is 18 to 30 cm (7 to 12 in])

Cr--97 to 201 cm (38 to 79 in); moderately cemented, weathered schist, tilted and jointed; few fine roots along fractures; clay coatings along some fractures.

TYPE LOCATION: Llano County, Texas; From the intersection of Texas Highway 16 and Ranch Road 2323, south of Llano, 11.3 miles southwest on Ranch Road 2323, 0.6 mile north on County Road 106, 2.2 miles north on local road, and 1.0 mile west in rangeland. (Scotts Crossing USGS topographic quadrangle; Latitude: 30 degrees, 40 minutes, 54.8 seconds N; Longitude: 98 degrees, 50 minutes, 14.9 seconds W; NAD83)

RANGE IN CHARACTERISTICS:
Depth to paralithic contact: 50 to 100 cm (20 to 40 in)
Solum thickness: 50 to 100 cm (20 to 40 in)

Particle-size control section (weighted average):
Clay content: 35 to 45 percent
Coarse fragments: amount-0 to 30 percent by volume; kind-quartz, schist, or gneiss; size-gravel, cobbles, and channers

A horizon
Hue: 5YR to 10YR
Value: 3 to 5, 2 to 4 moist
Chroma: 2 to 4, dry and moist
Texture: Sandy loam, fine sandy loam, loam, sandy clay loam, or clay loam
Coarse fragments: 0 to 10 percent by volume
Reaction: Slightly acid to slightly alkaline
Other features: In pedons where moist value and chroma are 3 or less, the epipedon is not thick enough for a mollic epipedon.

Bt horizon
Hue: 2.5YR to 7.5YR
Value: 3 to 6, 2 to 5 moist
Chroma: 3 to 6, dry and moist
Texture: Sandy clay loam, clay loam, sandy clay, or clay, and their gravelly and channery counterparts
Clay content: 27 to 45 percent
Coarse fragments: 0 to 30 percent total by volume; Upper Bt-0 to 15 percent; lower Bt-10 to 30 percent
Reaction: Slightly acid to slightly alkaline

BCt horizon (where present)
Hue: 2.5YR to 7.5YR
Value: 3 to 6, 2 to 5 moist
Chroma: 3 to 6, dry and moist
Texture: Sandy clay loam or sandy clay, and their gravelly and channery counterparts
Clay content: 27 to 40 percent
Coarse fragments: 15 to 30 percent by volume
Reaction: Slightly acid to slightly alkaline

Cr layer
Kind: finely fractured schist and schistose gneiss bedrock
Cementation: Weakly to moderately cemented
Vertical fractures: Greater than 10 cm (4 in) apart horizontally
Bed tilt from horizontal: 10 degrees to 60 degrees

COMPETING SERIES: These include the Acove (TX), Bluegrove (TX), Callahan (TX), and Lindale (TX) soils. Similar soils are Cobb (TX), Castell (TX), Honeycreek (TX), Ligon (TX), and Lou (TX) series.
Acove soils: have sandstone fragments in the solum and are underlain by sandstone bedrock.
Bluegrove soils: are underlain by sandstone bedrock and have less than 5 percent rock fragments in the Bt horizon.
Callahan soils: have identifiable secondary carbonates within 76 cm (30 in) of the soil surface and are underlain by shale bedrock.
Castell soils: have an abrupt textural change between the surface and argillic horizon.
Cobb and Lou soils: have fine-loamy control sections and are underlain by sandstone bedrock and granite grus, respectively.
Honeycreek soils: have fine-loamy control sections and are 100 to 150 cm (40 to 60 in) to schist bedrock.
Ligon soils: have hues of 2.5YR and redder and moist values of 3 or less in the argillic horizon..
Lindale soils: are underlain by limestone and marine clays and do not have a lithic contact within 100 cm (40 in).

GEOGRAPHIC SETTING:
Parent material: Slope Alluvium derived from schist and/or gneiss underlain by pre-Cambrian schist bedrock
Landscape: Undulating plains
Landform: Footslopes of ridges and hills
Slope: 1 to 8 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 air 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: 210 to 240 days
Elevations: 305 to 686 m (1,000 to 2,250 ft)
Thornthwaite P-E Index: 34 to 46

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Castell, Fieldcreek, Honeycreek, Keese, Ligon, and Packsaddle soils.
Castell soils: occur on similar positions.
Fieldcreek soils: have less than 18 percent clay in the control section and occur on floodplains.
Honeycreek soils: occur in similar but slightly lower positions.
Keese soils: Are less than 50 cm (less than 20 in) to granite bedrock and occur on shoulders, summits and backslopes of ridges and hills.
Ligon soils: are on shoulders, backslopes and summits of ridges and hills.
Packsaddle soils: have mollic epipedons and occur on slightly higher, convex positions.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is slow. Runoff is medium on 1 to 5 percent slopes and high on 5 to 8 percent slopes.

USE AND VEGETATION: This soil is used mainly for rangeland; some small areas are used for growing small grain, forage sorghum, and improved pasture grasses. The principal vegetation is blackjack oak, post oak, live oak, lovegrass, whitebrush, grama, and threeawn.

DISTRIBUTION AND EXTENT: Central Texas; Southwest Plateaus and Plains Range and Cotton Region, LRR-I; MLRA 82-Central Basin of Texas. This series is of moderate extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Mason County, Texas Reconnaissance Soil Survey of south-central Texas; 1913.

REMARKS:
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon: 0 to 23 cm (0 to 9 in). (A1 and A2 horizons)
Argillic horizon: 23 to 97 cm (9 to 38 in). (Bt1, Bt2, Bt3, BCt horizons)
Paralithic contact: 97 cm (38 in). (top of Cr layer)

ADDITIONAL DATA: Lab data available for type location from the National Soil Survey Laboratory on pedon number 87TX299004 (samples 87P02417-87P02423) from Llano County, TX.

TAXONOMIC VERSION: Keys to Soil Taxonomy, 11th edition, 2010.

National Cooperative Soil Survey
U.S.A.