LOCATION CARBENGLE               TX

Established Series
Rev. JJC-RM-CMR
05/2014

CARBENGLE SERIES

The Carbengle series consists of moderately deep, well drained, moderately permeable soils formed in residuum weathered from calcareous sandstone in Fleming and Oakville formations of Miocene age. These gently to strongly sloping soils occur on summits of interfluves and backslopes of side slopes of ridges on inland dissected coastal plain. Slopes range from 1 to 12 percent. Mean annual precipitation is about 1016 mm (40 in) and the mean annual temperature is about 20 degrees C (68 degrees F).

TAXONOMIC CLASS: Fine-loamy, carbonatic, thermic Udic Calciustolls

TYPICAL PEDON: Carbengle clay loam, on a west-facing, convex, 5 percent slope in pasture at an elevation of 114 m (374 ft). (Colors are for dry soil unless otherwise stated.)

A1--0 to 18 cm (0 to 7 in); very dark gray (10YR 3/1) clay loam, black (10YR 2/1), moist; weak fine granular structure; hard, friable; many fine roots; strong effervescence; moderately alkaline; clear smooth boundary.

A2--18 to 30 cm (7 to 12 in); very dark gray (10YR 3/1) clay loam, black (10YR 2/1), moist; weak fine subangular blocky structure; hard, friable; many fine roots; many fine pores; violent effervescence, ; moderately alkaline; abrupt wavy boundary. (Combined thickness of the A horizon is 18 to 46 cm [7 to 18 in])

Bk1--30 to 58 cm (12 to 23 in); light gray (10YR 7/2) loam, light gray (10YR 7/2), moist; moderate fine and medium subangular blocky structure; hard, very friable; common fine roots; common fine pores; common carbonate masses; violent effervescence; moderately alkaline; clear wavy boundary.

Bk2--58 to 86 cm (23 to 34 in); very pale brown (10YR 8/2) loam, light gray (10YR 7/2), moist; weak fine and medium subangular blocky structure; hard, very friable; common fine roots; common fine pores; 30 percent carbonate masses and common carbonate concretions; violent effervescence; moderately alkaline; abrupt wavy boundary. (Combined thickness of the Bk horizon is 18 to 46 cm [7 to 18 in])

Cr--86 to 152 cm (34 to 60 in); weakly cemented calcareous sandstone bedrock; structureless massive; weakly cemented; violent effervescence; interbedded with loamy materials; moderately alkaline.

TYPE LOCATION: Washington County, Texas; about 2 miles north of William Penn; from the intersection of Farm to Market Road 390 and Farm to Market Road 1935 in William Penn; 2 miles north on Farm to Market 1935 to Kettler Road; 0.2 miles west on Kettler Road (County Road 73), 250 ft south in native bluestem meadow. USGS topographic quad: Independence; Latitude: 30 degrees, 20 minutes, 29 seconds N; Longitude: 96 degrees, 16 minutes, 48 seconds W; UTM Easting: 761496 m, UTM Northing: 3359743 m, UTM Zone 14N. Datum: WGS84.

RANGE IN CHARACTERISTICS:
Depth of solum: 50 to 100 cm (20 to 40 in)
Soil moisture: Udic ustic soil moisture regime. The soil moisture control section is dry in some or all parts for four-tenths or less of the consecutive days per year when the soil temperature at a depth of 50 cm below the soil surface is higher than 5 degrees C and moist in some part either for more than 180 cumulative days per year or for 90 or more consecutive days in normal years.
Depth to paralithic contact: 50 to 100 cm (20 to 40 in)
Depth to secondary calcium carbonate: 18 to 46 cm (7 to 18 in)
Depth to calcic horizon: 18 to 46 cm (7 to 18 in)
Thickness of the mollic epipedon: 18 to 46 cm (7 to 18 in)

Particle-size control section (weighted average):
Clay content: 18 to 35 percent
Calcium carbonate equivalent: 40 to 75 percent

A horizon
Hue: 7.5YR or 10YR
Value: 3 or 4
Chroma: 1 to 3
Texture: loam, sandy clay loam, clay loam
Effervescence: strong or violent
Reaction: moderately alkaline

Bk horizon
Hue: 7.5YR to 2.5Y
Value: 4 to 7
Chroma: 2 to 6
Texture: loam, clay loam, sandy clay loam, silty clay loam
Calcium carbonate equivalent: 40 to 75 percent
Identifiable secondary carbonates: amount-5 to 50 percent; size-fine to coarse; kind-masses and concretions
Effervescence: strong or violent
Reaction: moderately alkaline

BCk horizon (where present)
Hue: 7.5YR to 2.5Y
Value: 5 to 8
Chroma: 2 to 6
Texture: loam, clay loam, sandy clay loam, silty clay loam, fine sandy loam
Mottles: amount-0 to 20 percent; size-fine to coarse; contrast-faint to prominent; colors-brownish yellow, light brownish gray, and pale yellow
Calcium carbonate equivalent: 40 to 75 percent
Identifiable secondary carbonates: amount-5 to 50 percent; size-fine to coarse; kind-masses and concretions
Effervescence: strong or violent
Reaction: moderately alkaline

Cr horizon
Texture: bedrock
Rupture resistance: weakly cemented to moderately cemented
Bedrock: calcareous sandstone that is interbedded with loamy sediments
Other features: Bedrock can be cut with a spade or auger. Roots penetrate only in occasional fractures and in loamy interbedded material.
Effervescence: strong or violent
Reaction: moderately alkaline

COMPETING SERIES: These are the Bolar (TX), Rumley (TX), Sunev (TX) and Topsey (TX) series in the same family.
Bolar soils: have a lithic contact with indurated limestone at a depth of 50 to 100 cm (20 to 40 in)
Rumley and Sunev soils: do not have a paralithic contact at a depth of 50 to 100 cm (20 to 40 in)
Topsey soils: have densic materials at a depth of 50 to 100 cm (20 to 40 in)
Similar soils: These are the Brenham, Engle, and Venus series.
Brenham and Venus soils: do not have a paralithic contact at a depth of 50 to 100 cm (20 to 40 in)
Engle soils: have less than 40 percent calcium carbonate equivalent

GEOGRAPHIC SETTING:
Parent material: residuum weathered from calcareous sandstone in Fleming and Oakville formations of Miocene age
Landscape: inland dissected coastal plain
Landform: summits of interfluves and backslopes of side slopes of ridges
Slope: 1 to 12 percent
Mean annual precipitation: 877 to 1146 mm (35 to 45 in)
Precipitation pattern: Precipitation is mostly even throughout the year with the exception of May, June, and October being the wettest months. July and August are the driest months.
Thornthwaite P-E index: 48 to 64
Mean annual air temperature: 19 to 21 degrees C (67 to 70 degrees F)
Frost-free period: 251 to 290 days
Elevation: 40 to 174 m (131 to 571 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Brenham, Cuero, Frelsburg, Klump, Knolle, Latium, and Renish series.
Brenham soils: occur on similar positions
Cuero soils: have a mollic epipedon greater than 50 cm (40 in) thickness and occur on slightly lower similar positions
Frelsburg soils: have slickensides and occur on similar positions
Klump and Knolle soils: have an argillic horizon and occur on similar positions
Latium soils: have slickensides and occur on similar more sloping positions
Renish soils: have a lithic contact with indurated sandstone at a depth of 25 to 50 cm (10 to 20 in) and occur on similar more sloping positions

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is low on 1 to 5 percent slopes, medium on 5 to 12 percent slopes.

USE AND VEGETATION: The major uses are livestock grazing and hay production. A few areas are used for crop production. Improved bermudagrass and corn are the principal crops. Native vegetation consists of a tall grass prairie of little bluestem, indiangrass, and big bluestem with a few large post oak, elm, and hackberry trees along the draws and in occasional motts. Numerous other grasses and a variety of forbs occur in the native plant community.

DISTRIBUTION AND EXTENT: South Central Texas; Land Resource Region J; MLRA 86B. The series is extensive.

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

SERIES ESTABLISHED: Washington County, Texas; 1978. The name "Carbengle" comes from the combination of the shortened form of the word "carbonatic", referring to the family mineralogy class, and the word "Engle", the name of a similar soil series.

REMARKS: Diagnostic horizon and features recognized in this pedon are:
Particle size control section: 25 to 86 cm (10 to 34 in) [A2, Bk1 and Bk2 horizons]

Mollic epipedon: 0 to 30 cm (0 to 12 in) [A1 and A2 horizons]
Calcic horizon: 30 to 86 cm (12 to 34 in) [Bk1 and Bk2 horizons]
Paralithic contact: The contact with weakly cemented sandstone at 86 cm (34 in) [Cr horizon]
Paralithic materials: 86 to 152 cm (34 to 60 in) [Cr horizon]
Free carbonates: 0 to 152 cm (0 to 60 in) [A1, A2, Bk1, Bk2, and Cr horizons]
Secondary carbonates: 30 to 86 cm (12 to 34 in) [Bk1 and Bk2 horizons]

Additional comments:
Soil Interpretation Record Number: TX0790

ADDITIONAL DATA: KSSL Data: Fayette County, S08TX149001 (08N04384-08N04390); TAMU Data: Austin County, S08TX015001 (TAMU7335-TAMU7339).

Taxonomic version: Keys to Soil Taxonomy, Eleventh Edition, 2010.

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National Cooperative Soil Survey
U.S.A.