LOCATION COLLEEN VA
Established Series
Rev. SKT-WJE-MHC; DTA
09/2025
COLLEEN SERIES
MLRA(s): 136 (mesic part)
Soil Survey Regional Office (SSRO) Responsible: Southeast
Depth Class: Very deep
Agricultural Drainage Class: Well drained
Index Surface Runoff: Medium
Saturated Hydraulic Conductivity Class: Moderately low
Shrink-Swell Potential: Low
Landscape Piedmont uplands
Landform: Interstream divides, ridges, and side slopes
Parent Material: Residuum weathered from anorthosite
Slope: 2 to 25 percent
Mean Annual Air Temperature (type location) 13 degrees C (55 degrees F)
Mean Annual Precipitation (type location); 1067 millimeters (42 inches)
TAXONOMIC CLASS: Clayey, kaolinitic, mesic Typic Hapludults
TYPICAL PEDON: Colleen gravelly loam, on a 4 percent slope in a fescue and orchard grass pasture. (Colors are for moist soils.)
Ap--0 to 23 centimeters (0 to 9 inches); dark yellowish brown (10YR 4/4) gravelly loam; many medium prominent yellowish red (5YR 4/6) mottles; moderate fine granular structure; friable, slightly sticky, slightly plastic; many fine roots; 30 percent blue quartz gravel; moderately acid; clear smooth boundary. (0 to 30 centimeters (0 to 12 inches) thick.)
Bt1--23 to 74 centimeters (9 to 29 inches); red (2.5YR 4/8) gravelly clay; moderate fine subangular blocky structure; firm, moderately sticky, moderately plastic; common fine roots; many distinct clay films on faces of peds; 25 percent blue quartz gravel; strongly acid; gradual smooth boundary.
Bt2--74 to 127 centimeters (29 to 50 inches); red (2.5YR 4/8) gravelly clay; many medium prominent reddish yellow (7.5YR 7/8) mottles, and many medium prominent white (N 8/0) relict mottles; moderate fine and medium subangular blocky structure; firm, moderately sticky, moderately plastic; many distinct clay films on faces of peds; few fine flakes of mica; 25 percent blue quartz gravel; strongly acid; clear smooth boundary. (Combined thickness of the Bt horizon is 94 to 137 centimeters (37 to 54 inches.)
C--127 to 183 centimeters (50 to 72 inches); red (2.5YR 5/8), reddish yellow (5YR 6/8) and white (N 8/0) gravelly silty clay loam saprolite; massive; friable, slightly sticky, slightly plastic; common clay flows; few fine flakes of mica; 25 percent blue quartz gravel; strongly acid. (0 to 75 centimeters (0 to 30 inches) thick)
TYPE LOCATION: Nelson County, Virginia; about 0.6 miles southwest (231 degrees) of the intersection of Highways VA-672 and VA-655 and about 1.1 miles east (100 degrees) of the intersection of Highways VA-151 and VA-674, in pasture. USGS Arrington, Virginia topographic quadrangle.
Latitude--37.744
Longitude-- -78.972
Datum--WGS84
RANGE IN CHARACTERISTICS:
Solum thickness: 102 to 152 centimeters (40 to 60 inches) or more
Depth to Bedrock: Greater than 152 centimeters (60 inches)
Depth to Seasonal High Water Table: Greater than 152 centimeters (60 inches)
Rock Fragment Content: 0 to 35 percent, by volume, angular blue quartz and anorthosite gravel throughout
Mica Content: 0 to 20 percent, by volume
Soil Reaction: very strongly acid to slightly acid in the A and Ap horizons, extremely acid to strongly acid in the Bt horizon, and very strongly acid to moderately acid in the C horizon.
RANGE OF INDIVIDUAL HORIZONS:
Ap horizon:
Color--hue of 7.5YR or 10YR, value of 4 or 5, chroma of 3 to 6
Texture (fine-earth fraction)--fine sandy loam, loam, or silt loam
A horizon, where present:
Color--hue of 7.5YR or 10YR, value of 2 or 3, chroma of 2 to 4. Where chroma is less than 4, the horizon is less than 6 inches thick.
Texture (fine-earth fraction)--fine sandy loam, loam, or silt loam
E horizon, where present:
Color--hue of 7.5YR or 10YR, value of 5 to 8, chroma of 4 to 8
Texture (fine-earth fraction)--fine sandy loam, loam, or silt loam
Bt horizon:
Color--hue of 2.5YR through 7.5YR, value of 4 to 6, chroma of 6 or 8.
The lower part of most pedons is mottled, and colors inherited from saprolite range to neutral, value of 8, and chroma of 0.
Texture (fine-earth fraction)--clay, clay loam, or silty clay loam fraction.
C horizon:
Color--hue of 2.5YR to 5Y, or is neutral, value of 4 to 6, chroma of 0 to 8
Texture (fine-earth fraction)--sandy loam, loam, silt loam, silty clay loam, or clay loam saprolite
COMPETING SERIES:
Culpeper soils--contain rock fragments of arkosic sandstone, quartzite, phyllite, and schist and formed in materials weathered from these rocks.
Elioak soils--contain rock fragments of quartz muscovite schist and graywacke sandstone, and formed in materials weathered from these rocks and are moderately permeable.
Minnieville soils--contain rock fragments of hornblende gneiss or schist and formed in materials weathered from these rocks.
GEOGRAPHIC SETTING:
Landscape: Piedmont uplands
Landform: Interstream divides, ridges, and side slopes
Parent Material: Residuum weathered from anorthosite
Mean Annual Air Temperature: 11 to 14 degrees C (52 to 57 degrees F)
Mean Annual Precipitation: 914 to 1118 millimeters (36 to 44 inches)
Frost-free period: 152 to 183 days
GEOGRAPHICALLY ASSOCIATED SOILS:
Pineywoods soils--are poorly drained
Sketerville soils--are moderately well drained
DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Agricultural Drainage Class: Well drained
Index Surface Runoff: Medium
Saturated Hydraulic Conductivity Class: Moderately low
USE AND VEGETATION:
Major Uses: Pasture, hayland, and woodland
Dominant Vegetation: Mixed hardwood and pine
SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Auburn, Alabama
DISTRIBUTION AND EXTENT:
Distribution: Virginia
Extent: Small
SERIES ESTABLISHED: Nelson County, Virginia, 1992.
REMARKS:
The June 2024 revision changed the location of this series to mesic MLRA 136 from MLRA 148. This was due to boundary line changes in the new Ag. Handbook 296.
The September 2025 revision reformatted the description to semi-tabular. No data was changed.
Revised=1/23/92, MHC. Revised=9/2025, DTA
Diagnostic horizon and soil characteristics recognized in this pedon:
Ochric epipedon--the zone from 0 to 23 centimeters (0 to 9 inches). (Ap horizon)
Argillic horizon--the zone from 23 to 127 centimeters (9 to 50 inches). (Bt horizon)
ADDITIONAL DATA:
Typical Data Map Unit:
Typical User Pedon ID:
SIR=VA0292
________________________________________
National Cooperative Soil Survey
U.S.A.