LOCATION BOLAR                   TX

Established Series
Rev. GLL:CLN
04/2022

BOLAR SERIES

The Bolar series consists of moderately deep, well drained, moderately permeable soils formed in interbedded limestones and calcareous marls formed in residuum. These occur on summits, shoulders, and backslopes of ridges on hills. The slopes range is 1 to 15 percent. Mean annual precipitation is about 711 to 914 mm (28 to 36 in) and mean annual air temperature is about 17.8 to 20 degrees C (64 to 68 degrees F).

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

TYPICAL PEDON: Bolar clay loam--cultivated. (Colors are for dry soil unless otherwise stated.)

Ap--0 to 15 cm (0 to 6 in); brown (10YR 4/3) clay loam; dark brown (10YR 3/3) moist; weak fine subangular blocky and granular structure; hard, friable; few fine strongly cemented calcium carbonate concretions; moderately alkaline; calcareous; abrupt smooth boundary. (Thickness is 10 to 20 cm [4 to 8 in])

A--15 to 41 cm (6 to 16 in); dark brown (10YR 3/3) clay loam, very dark brown (10YR 2/2) moist; moderate fine subangular blocky and granular structure; hard, friable; few strongly cemented calcium carbonate concretions; moderately alkaline; calcareous; clear smooth boundary. (Thickness is 7 to 30 cm [3 to 12 in])

Bk1--41 to 71 cm (16 to 28 in); pale brown (10YR 6/3) clay loam, brown (10YR 5/3) moist; moderate fine subangular blocky and granular structure; hard, firm; common fine strongly cemented concretions and few threads and films of calcium carbonate; moderately alkaline; calcareous; gradual smooth boundary. (Thickness is 20 to 38 cm [8 to 15 in])

Bk2--71 to 81 cm (28 to 32 in); very pale brown (10YR 7/3) clay loam, pale brown (10YR 6/3) moist; moderate fine subangular blocky and granular structure; hard, firm; common fine strongly cemented concretions and common films and threads of calcium carbonate; few fragments of limestone less than 8 cm (3 in) across; moderately alkaline; calcareous; clear smooth boundary. (Thickness is 0 to 20 cm [0 to 8 in])

Bk3--81 to 91 cm (32 to 36 in); interbedded yellowish brown (10YR 5/4) clay loam and limestone; weak fine subangular blocky structure; 30 percent by volume of limestone fragments up to 13 cm (5 in) across the long axis; common soft masses, films and threads of calcium carbonate; moderately alkaline; calcareous; abrupt smooth boundary. (Thickness is 0 to 18 cm [0 to 7 in])

R--91 to 112 cm (36 to 44 in); indurated limestone bedrock, that is fractured and interbedded with calcareous marly clay.

TYPE LOCATION: Erath County, Tx; from the intersection of Loop 195 and Farm Road 914, in the south part of Stephenville, Texas; 5.6 miles south on Farm Road 914, then 80 yards east of the road in the north edge of a cultivated field. USGS topographic quadrangle: Stephenville, Texas; Latitude: 32 degrees, 8 minutes, 52.37 seconds N; Longitude: 98 degrees, 11 minutes, 20.17 seconds W; Datum: WGS84. UTM Easting 576487.14 m, UTM Northing 3557115.31 m, UTM Zone 14.

RANGE IN CHARACTERISTICS:
Soil Moisture: Ustic soil moisture regime. The soil moisture control section is dry in some or all parts for more than 90, but less than 120 days in normal years.
Depth to lithic contact: 51 to 102 cm (20 to 40 in)
Depth to secondary calcium carbonate: 33 to 51 cm (13 to 20 in)
Thickness of the mollic epipedon: 33 to 51 cm (13 20 in)
Particle-size control section (weighted average)
Clay content: 20 to 35 percent
Rock fragments: 1 to 35 percent
CCE: 40 to 75



A Horizon
Hue: 7.5YR or 10YR
Value: 2 to 5
Chroma: 2 or 3
Texture: loam, clay loam, silty clay loam, or their gravelly counterparts.
Clay content: 20 to 35 percent
Rock fragments: 1 to 35 percent; 2 to 457 mm; limestone fragments
Effervescence: strong
Reaction(pH): moderately alkaline (7.9 to 8.4)



Bk Horizons
Hue: 7.5YR, 10YR, or 2.5Y
Value: 4 to 7
Chroma: 2 to 6
Texture: loam, clay loam, or silty clay loam, or their gravelly counterparts.
Clay content: 20 to 35 percent
Rock fragments: 1 to 35 percent; 2 to 457 mm; limestone fragments and indurated carbonate concretions
Calcium carbonate equivalent: 40 to 75 percent
Effervescence: strong to violent
Reaction(pH): moderately alkaline (7.9 to 8.4)



R Layer
Indurated fractured limestone interbedded with chalky limestone, marl, or marly clay at vertical intervals of about 2 to 5 cm (6 to about 12 in).

COMPETING SERIES: These are the Carbengle, Rumley, Sunev, and Topsey series in the same family.
Carbengle, Rumley, Sunev, and Topsey soils: lack a lithic contact within 102 cm (40 in).

GEOGRAPHIC SETTING:
Parent material: residuum derived from interbedded limestones and calcareous marls of cretaceous age mainly in the Georgetown, Denton clay, Fort Worth limestone, Duck Creek limestone, and Kiamichi clay formations
Landscape: Hills
Landform: Summits, shoulders, and backslopes of ridges
Slope: 1 to 15 percent
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 precipitation: 711 to 914 mm (28 to 36 in)
Thornthwaite P-E Index: 44 to 56
Mean annual air temperature: 18 to 20 degrees C (64 to 68 degrees F)
Frost-free period: 197 to 263 days
Elevation: 198.1 to 463 m (650 to 1519 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Denton, Purves, Somervell, Venus, Brackett, Dugout, Karnes, and Tarrant series.
Denton soils: more clay in surface horizons
Purves soils: more clay and a lithic contact at 20 to 51 cm
Somervell soils: contain more than 35 percent coarse fragments in the control section
Venus soils: less than 40 percent carbonates in the control section
Brackett and Dugout soils: are shallow soils with light colored surface layers.
Karnes soils: have a light-colored surface layer and a coarse-loamy control section.
Tarrant soils: are shallow and have a clayey-skeletal control section.

DRAINAGE AND PERMEABILITY: Well drained. Permeability is moderate. Runoff is medium to rapid.

USE AND VEGETATION: Mostly used for pasture or range. Some areas are used for growing small grains, sorghums, cotton, and corn. Native vegetation is dominantly midgrasses, including little bluestem and sideoats grama.

DISTRIBUTION and EXTENT: moderate
In Texas; mostly in the Grand Prairie area of central and north-central Texas; LRR J; MLRA 85
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Eastland County, Texas; 1972.

REMARKS: The Bolar series formerly was included in the Denton series.

Diagnostic features and horizons recognized in this pedon are:
Particle size control section: 25 to 91 cm (10 to 36 in). (A, Bk1, Bk2, and Bk3 horizons)

Mollic epipedon - 0 to 41 cm (0 to 16 in). (Ap and A horizons)Calcic horizon - 41 to 91 cm (16 to 36 in). (Bk1, Bk2, and Bk3 horizons)Lithic contact - at 91 cm (36 in) contact with indurated limestone bedrock

Additional Comments: Classification was changed 11/89 from Typic Calciustolls to Udic Calciustolls.

ADDITIONAL DATA: 96TX143011, 96TX143014
Taxonomic Version: Keys to Soil Taxonomy, Twelfth Edition, 2014

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National Cooperative Soil Survey
U.S.A.