LOCATION BROOKE WV+OH PA
Established Series
Rev. KOS-WJE-AWD
04/2025
BROOKE SERIES
The Brooke series consists of moderately deep, well drained soils with low saturated hydraulic conductivity formed in residuum weathered from fractured limestone. Slope ranges from 3 to 35 percent. Mean annual precipitation is about 1000 millimeters and mean annual air temperature is about 1.0 degrees C.
TAXONOMIC CLASS: Fine, mixed, active, mesic Mollic Hapludalfs
TYPICAL PEDON: Brooke silty clay loam - cultivated
(Colors are for moist soils.)
Ap--0 to 18 centimeters; very dark grayish brown (10YR 3/2) heavy silty clay loam; strong coarse granular structure; firm; slightly sticky; many roots; neutral; abrupt smooth boundary. (15 to 25 centimeters thick.)
AB--18 to 23 centimeters; dark brown (10YR 4/3) heavy silty clay loam; moderate medium and fine subangular blocky structure; firm; plastic and slightly sticky; many roots; neutral; clear smooth boundary. (O to 10 centimeters thick).
Bt--23 to 56 centimeters; dark brown (7.5YR 4/4) clay; moderate and strong medium subangular blocky structure; firm; very plastic and sticky; common discontinuous clay films on some vertical and horizontal faces of peds; few strong brown (7.5YR 5/6) remnants of silty impure limestone and a few soft fragments of shale; common roots; neutral; clear wavy boundary. (18 to 50 centimeters thick.)
C--56 to 97 centimeters; mixed dark brown (10YR 4/3) and olive gray (5Y 5/2) clay; massive; firm; plastic and sticky; common small fragments of limestone; occasional manganese coatings on surfaces of cracks; 5 to 10 percent weathered small fragments of shale; calcareous. (0 to 70 centimeters thick.)
R--97 centimeters; fractured limestone.
TYPE LOCATION: Brooke County, West Virginia; 1 mile north of Ohio-Brooke County line, 1-1/2 miles north of West Liberty, on State Route 28/3; 100 feet east of the road.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 45 to 99 centimeters. Depth to lithic contact ranges from 51 to 99 centimeters. Coarse fragments of limestone and soft shale range from 0 to 15 percent in the A horizon, 0 to 30 percent in the B horizon, and 5 to 50 percent in the C horizon. They may make up as much as 40 percent of individual subhorizons of the B horizons. Reaction ranges from medium acid to mildly alkaline in the A and B horizons, and from slightly acid to moderately alkaline in the C horizon.
The A or Ap horizons have hues of 10YR, 7.5YR, or 2.5Y, with values and chroma of 3.5 or less. A2 or A3 horizons have hues of 10YR, 7.5YR, or 2.5Y, values of 2 through 5, and chroma of 2 through 4. The A horizon is silty clay loam, clay loam, or silty clay.
The B horizon has hues mostly of 10YR or 7.5YR, values of 3 through 5, anc chroma of 3 through 8. Some pedons have hues of 2.5Y or 5Y, values of 4 or 5, and chroma of 3 or 4. Color variegation included hue of 5Y, values of 3 through 5, and chroma of 2 or 3 and may occur within subhorizons of the B horizon in some pedons. The B horizon is silty clay or clay.
The C horizon has hues mostly of 10YR, 2.5Y or 5Y, values of 4 or 5, and chroma of 2 or 3. The C horizon is silty clay or clay. Most pedons have lithochromic mottles in the C horizon.
COMPETING SERIES: The
Basco,
Belpre,
Caleast,
Fleming, McAfee, and
Salvisa series are in the same family. The Basco, Belpre, Caleast, and Fleming soils lack a lithic contact within depths of 20 to 40 inches; in addition, the Basco soils have textures of silt loam and silty clay loam in the upper part of the B2t horizon and the Belpre soils have free carbonates in the lower part of the solum. The McAfee soils have a subhorizon in the B2t with hue of 5YR. The Salvisa soils typically have low chroma mottles in the lower of the Bt horizon but the 10YR
Cynthiana.
Lowell,
Opequon, Tumbez, and
Upshur series are in related families.
Chilhowie, Cynthiana, Lowell, Opequon, Tumbez, and Upshur series are in related families. Chilhowie soils have more than 60 percent clay and depth to bedrock does not exceed 25 inches. Cynthiana and Opequon soils have a lithic contact within 20 inches of the surface. Lowell soils are more than 40 inches to bedrock. Tumbez soils lack an argillic horizon and have materials with more than 40 percent calcium carbonate equivalent immediately below the surface layer. The Upshur soils have hues redder than 7.5YR and have lighter colored A horizons, and have a paralithic or lithic contact at depths greater than 40 inches.
GEOGRAPHIC SETTING: The Brooke soils typically occur on ridges, saddles between ridges and rounded knolls. Slopes range from 3 to 35 percent. They are formed in residuum weathered from limestone or interbedded limestone and calcareous shales. The climate is humid temperature with average annual rainfall of 36 to 50 inches and average annual temperature of 50 to 57 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: In addition to the competing
Brookside and
Upshur soils, these are the
Clarksburg,
Gilpin,
Guernsey, and
Westmoreland soils. The Clarksburg, Gilpin and Westmoreland soils all have less than 35 percent clay in the texture control section. The Guernsey soils have mottling with chromas of 2 or less in the upper part of the argillic horizon.
DRAINAGE AND PERMEABILITY: Well drained; surface runoff is medium to rapid, depending on slope; permeability is slow.
USE AND VEGETATION: Mainly used for pasture, especially bluegrass, with alfalfa hay mixtures or more gentle slopes. Native vegetation is mixed hardwoods. Black locust trees are common in pasture.
DISTRIBUTION AND EXTENT: Western West Virginia, eastern Ohio and southwestern Pennsylvania. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Wheeling area, West Virginia, 1906.
REMARKS: Brooke soils are currently only correlated in 5 Soil Survey areas in MLRA 126 that are all over 40 years old and in need of revision. All recent soil survey work within the last 20 years in areas that had Brooke mapped has recorrelated these soils to Lowell or small areas of Faywood. The Brooke series is a candidate for deactivation.
Diagnostic horizons and features in this pedon are:
a. Ochric epipedon--the zone from 0 to 18 centimeters (Ap horizon).
b. Argillic horizon--the zone from 23 to 56 centimeters. (Bt horizon)
c. Lithic contact-- 97 centimeters. (top of R horizon).
Previous revision dates: 5/77
National Cooperative Soil Survey
U.S.A.