LOCATION DERB NY
The Derb series consists of deep and very deep, somewhat poorly drained, slowly permeable soils formed in silty glacial till containing a few soft shale or siltstone fragments. They are nearly level to sloping soils on till plains and glaciated dissected plateaus. Slopes range from 0 to 15 percent. Mean annual precipitation is about 38 inches. Mean annual temperature is about 52 degrees F.
TAXONOMIC CLASS: Fine-silty, mixed, active, acid, mesic Aeric Epiaquepts
TYPICAL PEDON: Derb silt loam - cultivated (Colors are for moist soil unless otherwise stated.)
Ap--0 to 6 inches, dark grayish brown (10YR 4/2) silt loam, moderate medium granular structure; friable; many fine roots; less than 5 percent fine shale fragments; strongly acid; abrupt smooth boundary. (5 to 12 inches thick)
Bw1--6 to 14 inches, brown (10YR 5/3) silt loam, faces of peds are light brownish gray (2.5Y 6/2); moderate medium subangular blocky structure; friable; common roots; 5 percent fine shale fragments; many (30 percent) medium prominent strong brown (7.5YR 5/6) redoximorphic concentrations; strongly acid; clear wavy boundary. (3 to 8 inches thick)
Bw2--14 to 24 inches, brown (10YR 5/3) silt clay loam; moderate coarse prismatic structure parting to moderate medium blocky; firm; few roots; 5 percent weathered shale fragments; many (30 percent) medium prominent strong brown (7.5YR 5/8) redoximorphic concentration; very strongly acid; clear wavy boundary. (5 to 10 inches thick)
BC--24 to 38 inches, olive (5Y 5/4) silty clay loam, faces of peds are light olive gray (5Y 6/2); moderate coarse prismatic structure parting to moderate thin and medium platy; firm; few roots; 5 percent shale fragments; many medium distinct yellowish brown (10YR 5/8) redoximorphic concentrations; very strongly acid; clear smooth boundary. (0 to 16 inches thick)
C--38 to 60 inches, olive (5Y 5/4) silty clay loam; weak medium platy structure; firm; 10 percent shale fragments; common medium distinct light gray (2.5Y 7/1) depletions and yellowish brown (10YR 5/8) redoximorphic concentrations; strongly acid.
TYPE LOCATION: Erie County, New York; Town of Eden; 1,000 feet east of Route NY 75, 150 feet south of Hardt Road, 20 feet east of pond. USGS Hamburg, NY topographic quadrangle; latitude 42 degrees, 40 minutes, 21 seconds N. and longitude 78 degrees, 51 minute, 13 seconds W. NAD 1927.
RANGE IN CHARACTERISTICS: The thickness of the solum ranges from 24 to 40 inches. Depth to shale bedrock ranges from 40 inches to 10 feet or more. Coarse fragment range from 0 to 10 percent in the solum and from 5 to 20 percent in the C horizons. Coarse fragment content in both the solum and substratum include up to 5 percent larger than 3 inches. The soil is very strongly acid or strongly acid. In some pedons, the soil becomes less acid below depths of 40 inches.
The Ap horizon has hue of 10YR or 2.5Y, value of 3 and 4 and
chroma of 2 or 3. It is silt loam or silty clay loam. It has
weak or moderate, fine and medium granular structure and very friable or friable consistence.
The Bw horizon has hue of 10YR through 5Y, value of 4 through 6, and chroma of 2 through 4. Faces of peds dominantly have chroma of 2 or less. High chroma mottles make up 50 percent or more in some subhorizons if the matrix chroma is 2 or less. The Bw horizon is silt loam or silty clay loam. It has weak or moderate structure, ranging from medium or coarse subangular blocky structure to medium, or coarse prismatic parting to fine to coarse blocky. It has friable or firm consistence.
The BC horizon has color and texture ranges similar to the Bw horizons; however, hue is commonly 2.5Y and 5Y. They have a moderate, medium, or coarse prismatic structure parting to weak or moderate, thin or medium platy.
The C horizon has hue of 10YR through 5Y, value of 4 through 6, and chroma of 1 through 4. It is silt loam or light silty clay loam in the fine earth fraction. It is massive or has weak or moderate medium or thick platy structure.
COMPETING SERIES: The Derb series is the only known soil in this family.
Patchin are similar soils in related families. Burdett, Darien, Fremont, Orpark and Patchin have a fine loamy particle size control section. In addition, Burdett and Darien soils have argillic horizons. Hornell and Kanona soils have more than 35 percent clay in the particle size control section.
GEOGRAPHIC SETTING: Derb soils are nearly level to sloping soils on plains and glaciated dissected plateaus where shale bedrock is commonly within depths of 10 feet. Slopes range from 0 to 15 percent. The soils developed in glacial till derived from soft shale and siltstone. The climate is humid and cool temperate. Mean annual precipitation ranges from 30 to 45 inches; mean annual temperature from 46 degrees to 56 degrees F.; and mean growing season from 120 to 180 days.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the competing
Orpark series and the
Manlius soils. Churchville soils formed in clayey lacustrine sediments that overlie glacial till and are on lower lying landscapes. Manlius soils are well drained, have loamy skeletal particle size control sections and shale bedrock at depths of 20 to 40 inches and are on typical bedrock controlled landforms.
DRAINAGE AND PERMEABILITY: Somewhat poorly drained. Runoff is slow to medium. Permeability is moderate or moderately slow in the solum and slow in the substratum. The soils have a perched seasonal high water table at depths of 6 to 18 inches from November through May.
USE AND VEGETATION: Most of the areas have been cleared, and are used for growing corn, small grain, and hay. Native vegetation was sugar maple, beech, white ash, hemlock and white pine.
DISTRIBUTION AND EXTENT: Glaciated dissected Allegheny Plateau and the adjacent areas of the Erie-Ontario Lowlands in New York and possibly Pennsylvania. MLRA's 101 and 140. The series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Amherst, Massachusetts
SERIES ESTABLISHED: Erie County, New York, 1979.
REMARKS: These soils have been considered as inclusions in
Fremont in past mapping. Sample No. S75NY-29-10 (NSSL Nos. 77PO567-77PO571) support this placement.
National Cooperative Soil Survey