LOCATION SLIDELL                 TX

Established Series
Rev. CLN:GLL
12/2016

SLIDELL SERIES

The Slidell series consists of very deep, moderately well drained, very slowly permeable soils that formed in calcareous, clayey sediments. These nearly level to gently sloping soils occur on base slopes of ridges on hills. Slope ranges from 0 to 5 percent. Mean annual precipitation is about 940 mm (37 in). Mean annual air temperature is about 18.3 degrees C (65 degrees F).

TAXONOMIC CLASS: Fine, smectitic, thermic Udic Haplusterts

TYPICAL PEDON: Slidell clay--pastureland (At center of microdepression).
(Colors are for dry soil unless otherwise stated)

Ap--0 to 15 cm (0 to 6 in); dark gray (10YR 4/1) clay, very dark gray (10YR 3/1) moist; moderate fine subangular blocky and granular structure; extremely hard, very firm; moderately sticky and moderately plastic; many fine roots; common fine and medium concretions of calcium carbonate; slightly effervescent; moderately alkaline; abrupt smooth boundary. Thickness is 10 to 20 cm (4 to 8 in)

A--15 to 48 cm (6 to 19 in); very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; few fine dark grayish brown redox concentrations in the lower part; moderate medium angular blocky structure; extremely hard, very firm; very sticky and very plastic; common fine roots; few fine pores; common pressure faces; few fine and medium concretions of calcium carbonate; slightly effervescence; moderately alkaline; gradual wavy boundary. Thickness is 15 to 64 cm (6 to 25 in)

Bss--48 to 81 cm (19 to 32 in); very dark gray (10YR 3/1) clay, black (10YR 2/1) moist; moderate medium angular blocky structure; extremely hard, very firm; very sticky and very plastic; few fine roots; few fine pores; common prominent slickensides; few vertical streaks of grayish brown (10YR 5/2); few fine and medium concretions of calcium carbonate; strongly effervescent; moderately alkaline; gradual wavy boundary. Thickness is 0 to 64 cm (0 to 25 in)

Bkss1--81 to 124 cm (32 to 49 in); grayish brown (10YR 5/2) clay, dark grayish brown (10YR 4/2) moist; weak coarse angular blocky structure; extremely hard, very firm; very sticky and very plastic; few fine roots; few fine pores; common prominent slickensides; few vertical streaks of very dark gray (10YR 3/1); common fine and medium concretions of calcium carbonate; strongly effervescent; moderately alkaline; diffuse boundary. Thickness is 15 to 107 cm (6 to 42 in)

Bkss2--124 to 183 cm (49 to 72 in); grayish brown (2.5Y 5/2) clay, dark grayish brown (2.5Y 4/2) moist; few fine distinct yellowish brown (10YR 5/6) masses of oxidized iron; weak coarse angular blocky structure; extremely hard, very firm; moderately sticky and moderately plastic; common prominent slickensides; few vertical streaks of very dark gray (10YR 3/1); common coarse concretions of calcium carbonate; violently effervescent; moderately alkaline; diffuse boundary. Thickness is 0 to 76 cm (0 to 30 in)

Bkss3--183 to 203 cm (72 to 80 in); light brownish gray (2.5Y 6/2) clay, grayish brown (2.5Y 5/2) moist; common fine distinct olive yellow (2.5Y 6/6) masses of oxidized iron; weak coarse angular blocky structure; very hard, very firm; moderately sticky and moderately plastic; common prominent slickensides; few vertical streaks of grayish brown (2.5Y 5/2); common coarse concretions and soft masses of calcium carbonate; violently effervescent; moderately alkaline.

TYPE LOCATION: Denton County, Texas (TX); from intersection of Farm Road 1173 and Farm Road 156 in Krum; 7.2 miles west on Farm Road 1173; 1.4 miles west on county road(Flow Road); about 800 feet south in pasture.
USGS topographic quadrangle: Era SE Texas;
Latitude: 33 degrees, 18 minutes, 01 seconds N;
Longitude: 97 degrees, 21 minutes, 55 seconds W;
Datum: WGS84.
UTM Zone 14, UTM Easting 652767.95 m, UTM Northing 3685743.14 m.

RANGE IN CHARACTERISTICS:
Soil moisture: Udic ustic soil moisture regime
Solum thickness: 152 to more than 203 cm (60 to more than 80 in)
Depth to calcic (where present): 102 to 183 cm (40 to 72 in)
Depth to slickensides: 15 to 64 cm (6 to 25 in)
Vertic features: When dry, cracks up to 1 inch wide extend to a depth of more than 20 inches. Cracks open and close more than once each year and remain open 90 to 150 cumulative days in most years.
Gilgai microrelief: Cycles of microdepressions and microknolls are repeated each 6 to 20 feet. In undisturbed areas, microknolls range from 8 to 41 cm (3 to 16 in) higher than microdepressions. Depth to any subhorizon having matrix colors with chroma more than 1.5, ranges from 51 to 127 cm (20 to 50 in) in more than 60 percent of any pedon (microdepressions). In less than 40 percent of the pedon there are chromas of 2 or more within depths ranging from 20 to 51 cm (8 to 20 in) (microknolls).

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

A and Bss horizons
Hue: 10YR
Value: 3 to 5
Chroma: 1
Texture: clay or silty clay
Rock fragments: 0 to 3 percent by volume, fine and medium gravel of quartz and/or limestone
Calcium carbonate equivalent: 0 to 20 percent
Effervescence: very slight to strong, but are noneffervescent in the center of some microdepressions
Reaction (pH): slightly alkaline to moderately alkaline (7.4-8.4)

Upper Bkss horizons
Hue: 10YR or 2.5Y
Value: 3 to 6
Chroma: 1 to 4
Texture: clay or silty clay
Redox features: none to common in shades of brown or yellow
Rock fragments: 0 to 5 percent by volume, fine and medium gravel of quartz and/or limestone
Identifiable secondary carbonates: 2 to 15 percent by volume, masses and concretions and are more common in microknolls
Calcium carbonate equivalent: 5 to 20 percent
Effervescence: slight to strong
Reaction (pH): slightly alkaline to moderately alkaline (7.4-8.4)

Lower Bkss horizons
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 2 to 4
Texture: clay or silty clay
Redox features: few to many in shades of brown, gray, olive, or yellow
Rock fragments: 0 to 5 percent by volume, fine and medium gravel of quartz and/or limestone
Identifiable secondary carbonates: 2 to 25 percent by volume, masses and concretions
Calcium carbonate equivalent: 15 to 60 percent
Effervescence: strong to violent
Reaction (pH): moderately alkaline (7.9-8.4)

BC or C horizon (where present)
Hue: 10YR or 2.5Y
Value: 5 to 7
Chroma: 1 to 4
Texture: clay or silty clay and some pedons have fractured limestone interbedded with marly silty clay or silty clay loam below a depth of 178 cm (70 in)

COMPETING SERIES: These are Bleiblerville, Branyon, Burleson, Clarita, Deport, Dimebox, Ellis, Fairlie, Heiden, Houston Black, Lazare, Leson, Luling, Ovan, Sanger, Sparenberg, and Watonga series in the same family.
Bleiblerville and Houston Black: contain less calcium carbonate in the control section
Branyon: occurs on terraces, have less amplitude of waviness between the A and B horizons and do not have colors with chroma of more than 1.5 within 50 cm (20 in) of the surface in some part of the pedon
Burleson, Deport, Dimebox, and Leson: are noncalcareous to a depth of more than 30 cm (12 in)
Clarita: have hue of 7.5YR or redder in the B horizon
Fairlie: has a paralithic contact with chalk at a depth between 102 to 152 cm (40 and 60 in)
Ellis, Heiden, Luling, Ovan, and Sanger: have chroma of more than 1.5 within 30 cm (12 in) of the soil surface in more than half the pedon
Sparenberg: occurs in a drier climate, in playas and ponds water for long periods
Watonga: has a thinner sola and occurs on flood plains

GEOGRAPHIC SETTING:
Parent material: calcareous clayey slope alluvium and/or residuum derived from clayey marl and shale of lower Cretaceous age
Landscape: hills
Landform: footslopes and toeslopes of ridges
Slope: 0 to 5 percent, but are mainly less than 3 percent
Mean annual precipitation: 711 to 1016 mm (28 to 40 in)
Thornthwaite P-E indices: 44 to 56
Mean annual air temperature: 17.2 to 20.0 degrees C (63 to 68 degrees F)
Frost free days range from 220 to 260
Elevation: 121.9 to 518.2 m (400 to 1700 feet)

GEOGRAPHICALLY ASSOCIATED SOILS: These include the competing Sanger series and the Bolar, Crawford, Denton, San Saba, and Somervell series.
Bolar, Crawford, San Saba, and Somervell soils: are moderately deep, 51 to 102 cm (20 to 40 in), to limestone bedrock and occur on higher positions
Denton soils: have a fine-silty particle-size control section, have carbonatic mineralogy, and occur on slightly higher positions
Sanger soils: occur on slightly higher positions

DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is very slow. Runoff is high on slopes of less than 1 percent and very high on 1 to 5 percent slopes. Water enters rapidly when the soil is dry and cracked, and very slowly when the soil is moist.

USE AND VEGETATION: Used for cropland, pasture, and range. Main crops are cotton, small grain, corn and grain sorghum. Pastures are mainly common and coastal bermudagrass. Native vegetation consists of bluestems, sideoats grama, buffalograss, and Texas wintergrass. Scattered mesquite, elm, and hackberry trees are in some areas.

DISTRIBUTION AND EXTENT: North-central Texas; Land Resource Region J, MLRA 85 (Grand Prairie). The series is extensive.

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

SERIES ESTABLISHED: Denton County, Texas; 1975.

REMARKS: These soils were formerly included in the San Saba and Houston Black series.

Edited 12/2016 (RFG-TRD): Converted to tabular format and added metric units. Updated competing series, geographic setting, and associated soils sections.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 25 to 102 cm (10 to 40 in)
Mollic epipedon - 0 to 81 cm (0 to 32 in) (A & Bss horizons)
Moist chroma of less than 1.5 in the upper 30 cm (12 in) in more than half of each pedon.
Cambic horizon - 81 to 203 cm (32 to 80 in) (Bkss horizons)
Vertic feature - Slickensides at a depth of 48 to 203 cm (19 to 80 in) (Bss & Bkss horizons)

ADDITIONAL DATA: KSSL data for pedons 57TX309090 and S10TX035006

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

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National Cooperative Soil Survey
U.S.A.