LOCATION LAWRENCEVILLE PA+NJEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, active, mesic Oxyaquic Fragiudalfs
TYPICAL PEDON: Lawrenceville silt loam-cultivated. (Colors are for moist soil unless otherwise noted.)
Ap--0 to 9 inches; dark grayish brown (10YR 4/2) silt loam; weak fine granular structure; friable; few rock fragments; slightly acid; clear smooth boundary. (8 to 12 inches thick)
BA--9 to 13 inches; yellowish brown (10YR 5/4) silt loam; weak medium subangular blocky structure; friable, slightly sticky and slightly plastic; few faint clay films on faces of peds; few rock fragments; slightly acid; clear wavy boundary. (0 to 6 inches thick)
Bt1--13 to 19 inches; dark yellowish brown (10YR 4/4) silt loam; moderate medium subangular blocky structure; friable, slightly sticky and slightly plastic; few faint clay films on faces of peds; 5 percent rock fragments; slightly acid; gradual wavy boundary. (4 to 8 inches thick)
Bt2--19 to 25 inches; dark yellowish brown (10YR 4/4) silt loam; few fine faint brown (10YR 5/3) mottles; moderate medium subangular blocky structure; friable, slightly sticky and slightly plastic; few faint clay films on faces of peds; common black coatings; few rock fragments; slightly acid; gradual wavy boundary. (4 to 10 inches thick)
Bx1--25 to 32 inches; dark yellowish brown (10YR 4/4) silt loam; common medium distinct light gray (10YR 7/2) and strong brown (7.5YR 5/6) mottles; moderate coarse prismatic structure parting to moderate medium subangular blocky; very firm, slightly sticky and slightly plastic; few faint clay films on faces of peds; few black coatings; few rock fragments; very strongly acid; clear wavy boundary. (5 to 12 inches thick)
Bx2--32 to 44 inches; brown (7.5YR 4/4) silt loam; many medium distinct reddish brown (5YR 5/4) and pinkish gray (7.5YR 7/2) mottles; moderate coarse prismatic structure parting to moderate medium platy; very firm, slightly sticky and slightly plastic; few faint clay films; few black coatings; few rock fragments; very strongly acid; gradual wavy boundary. (8 to 16 inches thick)
C1--44 to 68 inches; dark yellowish brown (10YR 4/4) silt loam; common medium distinct grayish brown (2.5Y 5/2) and yellowish red (5YR 5/8) mottles; moderate very coarse prismatic structure parting to moderate medium platy; firm, slightly sticky and slightly plastic; few black coatings; very strongly acid; gradual wavy boundary. (8 to 30 inches thick)
C2--68 to 74 inches; dark yellowish brown (10YR 4/4) silt loam; common medium distinct gray (10YR 6/1) and strong brown (7.5YR 5/6) mottles; moderate very coarse prismatic structure parting to moderate medium platy; firm, slightly sticky and slightly plastic; few rock fragments; strongly acid; abrupt wavy boundary. (0 to 10 inches thick)
2R--74 inches; dusky red (10R 3/4) shale and siltstone.
TYPE LOCATION: Montgomery County, Pennsylvania; Horsham Township, 1 3/4 miles west of Prospectville.
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 80 inches. Depth to bedrock is greater than 48 inches. Depth to fragipan ranges from 24 to 38 inches. The silty mantle ranges in thickness from 36 to 80 inches. Rock fragments in the solum, normally less than 10 percent by volume, have been weathered from shale, siltstone, sandstone or other underlying materials. Reaction throughout the soil ranges from very strongly to moderately acid when unlimed.
The A horizon has hue of 10YR or 7.5YR, value of 3 or 4, and chroma of 2 or 3. Texture is silt loam or loam in the fine-earth fraction.
The Bt horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 4 through 6. Texture is silt loam or silty clay loam with 18 to 34 percent clay in the fine earth fraction. Structure is weak to moderate fine to coarse subangular blocky. The Bx horizon has hue of 10YR or 7.5YR, value of 4 or 5, and chroma of 4 through 6 with many low chroma mottles in hue of 7.5YR through 2.5Y. Texture is silt loam or loam in the fine-earth fraction. Structure is weak to moderate, coarse or very coarse prismatic parting to platy.
The C horizon is similar in color, texture, and structure to the Bx horizon. Some pedons have an unconforming C horizon which varies in thickness, color, and amount of rock fragments depending on the underlying material.
COMPETING SERIES: The Aldino, Ava, Boston, Cincinnati, Grantsburg, Hildebrecht, Hosmer, Mercer, Nicholson, Otwell, Rainsboro, Weisburg, and Zanesville series are in the same family. Aldino soils have rock fragments of serpentine. Ava soils have a BA horizon immediately above the fragipan. Boston, Mercer, and Nicholson soils have more clay and less silt in the lower solum. Cincinnati soils have unconforming loamy glacial material with 40 inches. Grantsburg soils lack a lithologic discontinuity. Hosmer soils have an E' horizon immediately above the fragipan. Otwell soils are formed in a loess mantle overlying lacustrine or old alluvial material. Rainsboro soils have unconforming water deposited or stratified material within 40 inches. Weisburg soils contain glacial erratics. Zanesville soils developed in loess overlying acid sandstone, siltstone, and shale.
GEOGRAPHIC SETTING: These soils occur on nearly level to sloping uplands and terraces with an extreme slope range from 0 to 15 percent. The regolith consists largely of silty materials which mantle a wide range of consolidated and unconsolidated deposits. Climate is humid and temperate with mean annual temperature of 50 to 57 degrees F., mean annual precipitation of 40 to 46 inches, and a growing season of 140 to 200 days.
GEOGRAPHICALLY ASSOCIATED SOILS: Lawrenceville is a member of a drainage sequence which includes the well drained Duncannon, somewhat poorly drained Chalfont and the poorly drained Doylestown soils. The Abbottstown, Chester, Croton, Glenelg, Lansdale, Penn and Readington soils are nearby. Abbottstown, Croton, Penn and Readington soils have reddish hues inherited from parent materials. Chester, Glenelg, and Lansdale are well drained soils which lack fragipans and have loamy textures with more than 15 percent sand coarser than very fine sand. Duncannon soils do not have fragipans.
DRAINAGE AND PERMEABILITY: Moderately well drained with medium runoff and moderately slow permeability.
USE AND VEGETATION: Largely cleared and in cropland. Woodland areas are oak-hickory mixed hardwoods.
DISTRIBUTION AND EXTENT: Southeastern Pennsylvania and central New Jersey. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Stony Brook Watershed, New Jersey, 1951.
REMARKS: Diagnostic horizons and features recognized in this pedon are: 1. Ochric epepidon - the zone from the surface of the soil to a depth of about 13 inches (Ap and BA horizons). 2. Argillic horizon - the zone from 13 inches to a depth of about 25 inches (Bt1 and Bt2 horizons). 3. Fragipan - the zone from 25 inches to a depth of about 44 inches (Bx1 and Bx2 horizons).
ADDITIONAL DATA: Laboratory data for Lawrenceville is available from samples taken from Montgomery County, S60Pa-46-2-(1-8), Pennsylvania.
Classification only was changed in 11/94, competing series and other changes will be made later.