LOCATION TREGO MD+PA VAEstablished Series
TAXONOMIC CLASS: Fine-loamy, mixed, active, mesic Fragiaquic Hapludults
TYPICAL PEDON: Trego gravelly loam, southwest facing aspect, 3 percent slope, under regeneration shrub, elevation 600 feet. (colors are for moist soil)
Ap--0 to 9 inches; dark yellowish brown (10YR 3/4) gravelly loam; weak fine granular structure; friable; many fine and medium, few coarse roots; few fine tubular pores; 15 percent gravels; very strongly acid; clear smooth boundary. (5 to 10 inches thick)
BE--9 to 15 inches; brownish yellow (10YR 6/6) gravelly loam; weak medium subangular blocky structure; friable; common fine and medium roots, and few coarse roots; many fine vesicular pores, few medium vesicular pores and common fine tubular pores; 5 percent cobbles and 20 percent gravels; strongly acid; clear wavy boundary. (0 to 10 inches thick)
Bt--15 to 21 inches; brownish yellow (10YR 6/6) gravelly loam; moderate fine and medium subangular blocky structure; friable; common fine and medium roots, few coarse roots; common fine vesicular and tubular pores, few medium tubular pores; few faint clay skins on faces of peds; is percent gravels and 5 percent cobbles; strongly acid; abrupt wavy boundary. (0 to 10 inches thick)
Btx--21 to 38 inches; yellowish brown (10YR 5/4) gravelly sandy clay loam; weak coarse prismatic structure parting to moderate fine platy; firm; few fine roots confined to faces of prism; many fine, medium and coarse vesicular pores; many coarse distinct grayish brown (10YR 5/2) iron depletions and many coarse prominent strong brown (7.5YR 5/8) iron accumulation vertical streaks between faces of prism, common distinct clay skins on faces of peds and lining pores; common fine distinct light yellowish brown (2.5Y 6/4) silt coats on faces of prism; 1 percent cobbles and 25 percent gravels; moderately acid; clear irregular boundary. (10 to 20 inches thick)
B't--38 to 64 inches; red (2.5YR 4/6) gravelly sandy clay loam; weak medium subangular blocky structure; friable; few fine roots; common fine and medium vesicular pores and few fine tubular pores; common medium prominent light brownish gray (10YR 6/2) iron depletion in the upper part of the horizon and common coarse prominent brownish yellow (10YR 6/8) iron accumulation throughout, many distinct clay films around rock fragments and in pores; 5 percent cobbles, 15 percent gravels; moderately acid. (combined thickness of Bt is 20 to 35 inches)
BCt--64 to 78 inches; strong brown (7.5YR 5/8) gravelly sandy loam; many coarse distinct yellowish brown (10YR 5/8) mottles; weak medium subangular blocky structure; friable, few fine roots; few fine and medium vesicular pores; common distinct clay films around coarse fragments and lining pores;15 percent gravels and 5 percent cobbles; moderately acid; gradual wavy boundary. (0 to 15 inches thick)
C--78 to 96 inches; reddish yellow (7.5YR 6/8) sandy loam; common medium distinct strong brown (7.5YR 5/8) mottles; massive; friable; few fine vesicular pores; 10 percent gravels; moderately acid.
TYPE LOCATION: Washington County, MD; in a shrub woodlot, 250 feet north of Black Rock Road, and .5 miles west of Crystal Falls and Black Rock Road intersection, north of Mt. Lena. LATITUDE 39 341 5611 LONGITUDE 77 371 0611
RANGE IN CHARACTERISTICS: Solum thickness ranges from '40 to 70' inches. Bedrock is greater than 6 feet. Depth to fragic properties ranges from 20 to 30 inches. Rock fragments of gravels, cobbles and some stones range from 5 to 30 percent in the solum, and 10 to 40 percent in the substratum horizon. Reaction ranges from very strongly acid to moderately acid unless limed.
The A horizon has a hue of 7.5YR or 1OYR, value of 3 through 5, and chroma of 2 through 4. Texture is loam, or silt loam of the fine earth-fraction.
The E, EB, or BE horizon where present has hue of 7.5YR or 10YR, value 4 through 6, and chroma 4 to 8. Texture is loam, fine sandy loam, sandy loam, or silt loam in the fine-earth fraction.
The Bt or B't horizon has a hue of 2.5YR through 1OYR, value 4 through 6, and chroma 4 to 6. Texture is loam, sandy clay loam, or clay loam in the fine-earth fraction.
The Btx horizon has hue of 5YR through 1OYR, value of 4 through 6, and chroma of 4 to 8. Redoximorphic features are common. Texture is sandy loam, loam, or sandy clay loam in the fine-earth fraction.
The BC or BCt horizon has a hue of 2.5YR through 10YR, value 4 through 6, and chroma 4to B. Texture is loam, sandy loam, sandy clay loam, or loamy sand in the fine-earth fraction.
The C horizon has hue of 2.5YR through 1OYR, value 5 or 6, and chroma 4 through 8. Texture is sandy loam, loam, sandy clay loam, or clay loam in the fine-earth fraction.
COMPETING SERIES: There are no other series in the same family. Closely related soils are the Cookport, Glenville, and Raritan soils which have a fragipan, and the Adelphia, Bigpool, Blaiton, Holmdel, Kensington, Trackler, Wharton, Whiteside, and Woodstown soils which lack fragic properties. All of these soils are fine-loamy.
GEOGRAPHIC SETTING: Trego soils are on nearly level to slightly concave alluvial fans, and colluvial footslopes. Slopes ranges from 0 to 25 percent. The soils formed in alluvial materials with colluvial influences weathered from metamorphic crystalline rocks. Average annual temperature is 45 to 55 degrees F, and average annual precipitation is 35 to 45 inches. Climate is temperate and humid.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Bagtown, Braddock, Catoctin, Clymer, Dekalb, Jefferson, Lantz, Lehew, Murrill, Myersville, Rohrersville, Thurmont, and Weverton soils. The Bagtown, Braddock, Catoctin, Clymer, Dekalb, Jefferson, Lehew, Murrill, Myersville, Thurmont and Weverton soils lack a fragipan and are generally mapped on higher landscape positions. Rohrersville is somewhat poorly drained and is mapped in lower landscape positions. Lantz lacks a fragipan, and is very poorly drained.
DRAINAGE AND PERMEABILITY: Moderately well drained. Permeability is moderate above the fragic properties and slow in the fragic properties. Runoff is medium to rapid.
USE AND VEGETATION: Uses for general crops, pasture, and forest production. Native vegetation is mixed hardwood.
DISTRIBUTION AND EXTENT: Maryland, Virginia, and Pennsylvania. The series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Washington County, Maryland, 1938
REMARKS: Diagnostic features in this pedon are:
Ochric epipedon (0 to 15 inches)
Argillic horizon (15 to 64 inches)
Fragic properties (21 to 38 inches)