LOCATION DRYRUN MD+PAEstablished Series
TAXONOMIC CLASS: Loamy-skeletal, mixed, active, mesic Aquic Hapludults
TYPICAL PEDON: Dryrun gravelly silt loam, 1 percent slope in a crop field. (Colors are for moist soil.)
Ap1-- 0 to 6 inches; brown or dark brown (10YR 4/3) gravelly silt loam; weak medium platy structure, parting to weak fine granular; friable; many fine roots; common medium vesicular pores and few medium tubular pores; waterworn rock fragments are 12 percent mixed pebbles, 3 percent cobbles and 5 percent channers; neutral; clear smooth boundary.
Ap2--- 6 to 12 inches; brown or dark brown (10YR 4/3) gravelly silt loam; weak medium platy structure parting to weak fine subangular blocky; friable; many fine roots; many fine tubular and vesicular pores, few medium vesicular pores, and common medium tubular pores; waterworn rock fragments are 10 percent pebbles, and 3 percent cobbles and 5 percent channers; neutral; abrupt smooth boundary. (combined thickness 7 to 12 inches)
BE---- 12 to 21 inches; yellowish brown (10YR 5/6) gravelly silt loam; common medium distinct brown or dark brown (10YR 4/3) surface material in pores; moderate medium subangular blocky structure; friable; many fine roots; many fine tubular and vesicular pores, common medium tubular pores, and few medium vesicular pores; waterworn rock fragments 10 percent pebbles, 5 percent channers and 3 percent cobbles; neutral; clear smooth boundary. (5 to 7 inches thick)
Bt1--- 21 to 27 inches; yellowish brown (10YR 5/6) very gravelly loam; common medium prominent red (5YR 4/6) accumulations; moderate medium subangular blocky structure parting to moderate medium platy in the lower portion of the horizon; friable; common fine roots; many fine tubular and vesicular pores, common medium tubular and vesicular pores, few coarse vesicular pores; common faint discontinuous clay films on faces of peds; waterworn rock fragments are 20 percent pebbles, 10 percent channers, 3 percent cobbles and 3 percent flagstones; slightly acid; gradual irregular boundary.
Bt2-- 27 to 43 inches; strong brown (7.5YR 5/6) extremely gravelly sandy clay loam; many medium distinct light gray (7.5YR 7/1) depletions, many medium faint and prominent strong brown (7.5YR 5/8) and reddish brown (5YR 4/4) iron concentrations, and many coarse prominent pale brown (10YR 6/3) mottles; many medium iron and maganesse stains on faces of peds, surrounding rock fragments and lining pores; moderate medium platy structure in upper part parting to a weak medium platy in the lower part of the horizon; firm; few fine roots; common fine tubular pores, few medium tubular pores, many fine vesicular pores, and common coarse vesicular pores; waterworn rock fragments are 55 percent pebbles, 5 percent flagstone and 5 percent cobbles; many prominent discontinuous clay skins on faces of peds and in pores; moderately acid; clear wavy boundary. (combined thickness of the Bt horizons is 20 to 35 inches)
BC---- 43 to 61 inches; strong brown (7.5YR 5/6) extremely gravelly sandy clay loam; many medium iron maganesse stains; weak fine subangular blocky structure; friable; many fine vesicular pores; many fain patchy clay films on faces of peds and around rock fragments; waterworn rock fragments are 60 percent pebbles, 15 percent channers, 3 percent flagstones, and 5 percent cobbles; strongly acid; clear wavy boundary. (thickness is 10 to 20 inches)
C----- 61 to 74 inches; dark brown (7.5YR 4/4) extremely gravely sandy clay loam; common medium distinct strong brown (7.5YR 5/8) accumulations and few medium light brown (7.5YR 6/4) mottles; massive; friable; many fine vesicular pores; few distinct discontinuous clay films surrounding rock fragments and in pores; water worn rock fragments are 60 percent pebbles, 15 percent channers, 3 percent flagstones, and 5 percent cobbles; moderately acid. (thickness is 10 to 30 inches)
TYPE LOCATION: Washington County, MD; in crop field, .5 miles east of Fairview Road and St. Paul Church Road intersection, and 200 feet north of Fairview Road near the community of Dry Run. Latt. 39 42' 47" Long. 77 52' 28"
RANGE IN CHARACTERISTICS: Solum thickness ranges from 40 to 60 inches. Depth to bedrock is greater then 80 inches, and depth to limestone residuum is greater then 70 inches. Depth to redoximorphic features is greater than 24 inches. Rock fragments are quartzitic sandstone, shale and limestone and range from 10 to 25 percent in the Ap and BE horizons, and 35 to 75 percent in the subsoil and substratum. The reaction ranges from neutral to very strongly acid.
The Ap horizon has hue of 7.5YR, or 10YR, value of 3 through 5, and chroma of 3 through 6. Texture in the fine earth fraction is silt loam or loam, and their gravelly or cobbly analogous. Cobble size rock fragments can range up to 15 percent.
The BE horizon when present has hue of 7.5YR or 10YR, value of 3 through 6, and chroma of 3 through 6. Texture in the fine earth fraction is silt loam, loam, clay loam, or their gravelly or cobbly analogous. Cobble size rock fragments can range up to 10 percent.
The Bt horizon has hue of 5YR through 10YR , value of 4 through 6, and chroma of 4 through 8. Texture in the fine earth fraction commonly is clay loam, sandy clay loam or loam, but includes loamy sand and silt loam, in the fine earth fraction. Some pedons have Bt horizons which exhibit some brittle characteristics. Cobble size rock fragments can range up to 15 percent, stone size rock fragments can range up to 5 percent and flagstone size rock fragments can range up to 10 percent.
The C horizon has hue of 7.5YR through 2.5Y, value of 4 through 8, and chroma of 4 through 8. Texture in the fine earth fraction is commonly loam, sandy clay loam or clay loam and their gravelly and cobbly analogues, but also includes silt loam, and sandy loam.
COMPETING SERIES: There are no other known soil in the same family. Soils in closely related families are the Blackthorn, Croom, Elliber, Gainesboro, Hartleton, Irondale, Lew, Mertz, Pattenburg, Trevlec, and Weaverton. These soils are all well drained and do not have redoximorphic features within the upper 20 inches of the argillic.
GEOGRAPHIC SETTING: Dryrun soils occupy alluvial fans at the base of mountain streams flowing onto the valley floor. Slopes range from 0 to 15 percent, but are commonly 0 to 5 percent and landforms are relatively flat or slightly concave. Mean annual precipitation ranges from 38 to 50 inches, and mean annual air temperature ranges from 50 to 54 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Duffield, Funkstown, Hagerstown, Swanpond, Murrill, and Lindside soils. The Duffield and Hagerstown soils are on surrounding uplands along with Swanpond soils which occupies broad flat summits, back slopes, depressions, and upland drainage swales forms from limestone residuum. The Funkstown series occupies upland draws or drainageway and has less than 35 percent gravels in the particle size control section. Lindside contains less than 15 percent sand in the particle size control section.
DRAINAGE AND PERMEABILITY: Moderately well drained. Runoff is slow. Permeability is moderately permeable in the top soil and upper subsoil, moderately slowly to slowly permeable in the lower subsoil and moderately rapid to rapidly permeable soils in the substratum.
USE AND VEGETATING: Most areas are in crops or pasture.
DISTRIBUTION AND EXTENT: Maryland, West Virginia, Pennsylvania, and possibly Virginia. Total extent is moderate.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES PROPOSED: Dryrun, Washington County, Maryland, 1994.
REMARKS:
1. This soil was formerly included in the Murrill soil series.
2. Diagnostic horizons recognized in this pedon are: orchric epipedon, 0 to
12 inches; argilic subhorizon, 12 to 43 inches.
3. Redoximorphic features in the upper 20 inches of argillic.