LOCATION LOTT TX

Established Series
Rev. GLL-RMR-RM
02/2018

LOTT SERIES

The Lott series consists of very deep to clayey marl, well drained soils that formed in calcareous clayey residuum weathered from chalk, claystone, shale, and siltstone of Cretaceous age. These gently to moderately sloping soils are on ridges on dissected plains. Slopes range from 1 to 8 percent. Mean annual precipitation is about 966 mm (38.03 in) and the mean annual air temperature is about 19.3 degrees C (66.8 degrees F).

TAXONOMIC CLASS: Fine-silty, carbonatic, thermic Udorthentic Haplustolls

TYPICAL PEDON: Lott silty clay--in a cultivated field. (Colors are for dry soil unless otherwise stated.)

Ap--0 to 13 cm (0 to 5 in); dark grayish brown (10YR 4/2) silty clay, very dark grayish brown (10YR 3/2) moist; moderate very fine and fine granular structure; slightly hard, friable; common fine roots; few fine pores; few fragments of snail shells; few fine rounded siliceous pebbles; calcareous, moderately alkaline; clear smooth boundary. (13 to 30 cm [5 to 12 in] thick)

A--13 to 38 cm (5 to 15 in); dark grayish brown (10YR 4/2) silty clay, very dark grayish brown (10YR 3/2) moist; moderate fine subangular blocky and granular structure; hard, firm; common fine roots; common fine pores; calcium carbonate equivalent is 54 percent; few fine and medium fragments of chalk; few fragments of snail shell; few fine siliceous pebbles; calcareous; moderately alkaline; clear smooth boundary. (0 to 33 cm [0 to 13 in] thick)

Bw--38 to 76 cm (15 to 30 in); brown (10YR 5/3) silty clay, brown (10YR 4/3) moist; moderate fine subangular blocky structure; hard, firm; few fine roots; few fine pores; calcium carbonate equivalent is 60 percent; few fine and medium fragments of chalk; few fragments of snail shell; few wormcasts; calcareous; moderately alkaline; clear smooth boundary. (10 to 48 cm [4 to 19 in] thick)

Bk--76 to 119 cm (30 to 47 in); pale brown (10YR 6/3) silty clay, brown (10YR 5/3) moist; few fine faint very pale brown mottles; weak fine subangular blocky structure; hard, firm; few fine roots; common worm casts; calcium carbonate equivalent is 66 percent; common fine and medium fragments of chalk and soft masses of calcium carbonate; calcareous; moderately alkaline; clear smooth boundary. (20 to 51 cm [8 to 20 in] thick)

Cdk--119 to 203 cm (47 to 80 in); light gray (10YR 7/2), yellow (10YR 8/6) and white (10YR 8/1) clayey marl; massive to blocky, fractured; very hard and brittle, firm; few fine roots; many soft masses of calcium carbonate and few fine fragments of chalk in the upper part; calcareous; moderately alkaline.

TYPE LOCATION: Falls County, Texas; From the intersection of Farm To Market Road 1240 and Texas State Highway 6 in Perry, Texas; 6.93 miles east on Farm to Market Road 1240; 3.4 miles north on Farm to Market Road 2603, and 192 feet east in cultivated field.
USGS topographic quadrangle: Otto, TX;
Latitude: 31 degrees, 29 minutes, 20.5 seconds North;
Longitude: 96 degrees, 50 minutes, 33.1 seconds West.
Datum: WGS84

RANGE IN CHARACTERISTICS:

Solum depth: from 102 to 152 cm (40 to 60 in)
Soil Moisture: An ustic soil moisture regime. The soil moisture control section is dry in some or all parts for 90 or more cumulative days per year in normal years.
Mean annual soil temperature: 15 to 22 degrees C (59 to 72 degrees F)
Surface fragments: amount-0 to 2 percent; kind-quartzite, size-gravel

Particle-size control section (weighted average):
Clay content: 35 to 50 percent
Silicate clay content: 25 to 35 percent
Rock fragments: amont-0 to 2 percent; kind-quartzite; size-gravel
Calcium carbonate equivalent: 40 to 80 percent
Texture: Clay, silty clay, or silty clay loam

A horizon
Hue: 7.5YR or 10YR
Value: 2 to 4, dry or moist
Chroma: 2 or 3, dry or moist
Texture: clay, clay loam, silty clay, or silty clay loam
Rock fragments: amont-0 to 6 percent; kind-chalk; size-gravel
Reaction: slightly alkaline

Bw horizon
Hue: 10YR or 2.5Y
Value: 5 to 7, dry or moist
Chroma: 2 to 4, dry or moist
Texture: clay, silty clay, or silty clay loam
Rock fragments: amont-0 to 6 percent; kind-chalk; size-gravel
Calcium carbonate equivalent: 40 to 60 percent
Reaction: slightly alkaline

Bk horizon
Hue: 10YR or 2.5Y
Value: 6 to 8, dry or moist
Chroma: 3 to 6, dry or moist
Texture: clay, silty clay, or silty clay loam
Rock fragments: amont-0 to 6 percent; kind-chalk; size-gravel
Calcium carbonate equivalent: 45 to 80 percent
Reaction: moderately alkaline
Other features: Some pedons contain a few brownish, yellowish, or whitish streaks and mottles

Cdk, Ck and C horizons
Hue: 10YR or 2.5Y
Value: 6 to 8, dry or moist
Chroma: 1 to 6, dry or moist
Texture: silty clay loam, silt loam, or clayey marl
Rock fragments: amont-0 to 15 percent; kind-chalk; size-gravel
Calcium carbonate equivalent: 60 to 80 percent
Reaction: moderately alkaline
Other features: The consistence is very hard and brittle when dry; however, the material slakes readily in water

COMPETING SERIES: This is the Austin series in the same family. Similar soils are the Altoga, Bolar, Lewisville, Sunev, and Venus series.
Austin soils: have sola 51 to 102 cm (20 to 40 in) thick over a paralithic contact with chalk.
Altoga soils: lack mollic epipedons.
Bolar, Sunev, and Venus soils: have fine-loamy control sections.
Lewisville soils: have mixed mineralogy.

GEOGRAPHIC SETTING:
Parent material: calcareous silty and clayey residuum weathered from chalk, claystone, siltstone, and shale of the Cretaceous Period mainly in the Ozan, Austin, and Grayson Geologic Formations.
Landscape: Dissected plains
Landform: Summits and shoulders on interfluves and backslopes on sideslopes on low ridges
Slope: 1 to 8 percent
Mean annual precipitation: 711 to 1016 mm (28 to 40 in)
Mean annual air temperature: 18 to 21 degrees C (64.4 to 69.8 degrees F)
Frost free days: 230 to 266 days
Elevation: 158.5 to 457 m (520 to 1499 ft)
Thornthwaite P-E Index: 50 to 64

GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing Austin series and the Heiden, Houston Black, Lewisville, Stephen, Ponder, and Sanger series.
Austin soils: are on similar positions and are moderately deep to chalk.
Heiden and Houston Black soils: have intersecting slickensides.
Lewisville soils: are on risers and treads of adjacent stream terraces and are very deep to clayey alluvium
Stephen soils: are on adjacent summits on ridges and are shallow to a paralithic
Ponder and Sanger soils: are typically on lower positions in the landscape. In addition, Ponder soils have a clayey argillic horizon and Sanger soils have intersecting slickensides.

DRAINAGE AND PERMEABILITY:
Drainage class: Well;
Permeability class: Moderately slow
Runoff: medium on slopes of 1 to 5 percent and and high on slopes of 5 to 8 percent;

USE AND VEGETATION: Mostly cultivated to small grains, cotton, and grain sorghum. Original vegetation was mid and tall grasses such as little bluestem, indiangrass, and sideoats grama. Grasses now are mainly gramas and buffalograss.

DISTRIBUTION AND EXTENT: This soil occurs in the Texas Blackland Prairies, Northern Part (MLRA 86A). The series is of moderate extent.

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

SERIES ESTABLISHED: Falls County, Texas; l975.

REMARKS: The Lott series was formerly included in the Austin series.

Classification was changed 11/89 from fine-silty, carbonatic, thermic Entic Haplustolls to fine-silty, carbonatic, thermic Udorthentic Haplustolls.

Diagnostic features and horizons recognized in this pedon are:

Mollic epipedon: 0 to 38 cm (0 to 15 in) (Ap and A horizons)
Cambic horizon: 38 to 119 cm (15 to 47 in) (Bw and Bk horizons)
Densic materials: 119 to 203 cm (47 to 80 in) (Cdk horizon)
Carbonatic: greater than 40 percent calcium carbonate equivalent in control section.

ADDITIONAL DATA: KSSL pedon S1974TX1450003

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

National Cooperative Soil Survey
U.S.A.