LOCATION MCCOLL SC+NCEstablished Series
TAXONOMIC CLASS: Fine, kaolinitic, thermic Typic Fragiaquults
TYPICAL PEDON: McColl loam, cultivated. (Colors are for moist soil.)
Ap--0 to 6 inches; very dark gray (10YR 3/1) loam; weak fine granular structure; very friable; many fine roots; medium acid; abrupt wavy boundary. (4 to 8 inches thick)
Btg1--6 to 9 inches; dark grayish brown (10YR 4/2) sandy clay loam; weak fine subangular blocky structure; friable; common fine roots; strong brown stains lining old root channels; few fine pores; strongly acid; clear smooth boundary.
Btg2--9 to 13 inches; light brownish gray (2.5Y 6/2) clay; weak fine subangular blocky structure; firm; sticky; common fine roots; strong brown stains lining old root channels; common fine pores; few distinct clay films; very strongly acid; clear irregular boundary. (Combined thickness of the Btg horizon is 8 to 28 inches)
Btg/Bx--13 to 23 inches; 60 percent light brownish gray (2.5Y 6/2) clay; weak medium subangular blocky structure; firm, sticky; common fine roots; common fine pores; few distinct clay films (Btg part); 40 percent strong brown (7.5YR 5/6) sandy clay loam; strong coarse prismatic structure which is about 1 inch in diameter at the top and about 3 inches at the bottom; prisms part horizontally to coarse platy structure; firm; brittle; common fine and medium pores with the larger pores coated or filled with gray clay (Bx part); few medium prominent red (2.5YR 4/8) iron accumulations; boundary between gray clay and strong brown sandy clay loam is sharp; strongly acid; clear irregular boundary. (0 to 15 inches thick)
Btx--23 to 42 inches; strong brown (7.5YR 5/6) sandy clay loam; moderate coarse prismatic structure parting to strong coarse platy; firm; brittle; many fine and medium pores, some of which are coated or filled with gray clay; common medium prominent red (2.5YR 4/8) iron accumulations; about 20 percent of this horizon is vertical streaks of light gray (10YR 7/1) clay; weak medium subangular blocky structure; firm; moderately sticky, slightly plastic; common fine roots in upper part and few fine roots in lower part; very strongly acid; gradual wavy boundary. (Combined thickness of the Btx horizon is 15 to 32 inches.)
BC1--42 to 63 inches; strong brown (7.5YR 5/6) sandy clay loam; weak medium subangular blocky structure; friable, firm in place; moderately sticky, slightly plastic; common medium prominent pale brown (10YR 6/3) iron depletions, common fine prominent red (2.5YR 4/6) iron accumulations, and many medium and coarse prominent light gray (10YR 7/1) iron depletions that are massive clay; strongly acid; gradual wavy boundary. (15 to 30 inches thick)
BC2--63 to 75 inches; strong brown (7.5YR 5/6) sandy loam; massive; friable; common medium prominent pale brown (10YR 6/3) iron depletions, red (2.5YR 4/6) iron accumulations, and many medium and coarse prominent light gray (10YR 7/1) iron depletions that are sandy clay loam; strongly acid; gradual wavy boundary. (Combined thickness of the BC horizon is 15 to 35 inches.)
Cg--75 to 80 inches; light gray (10YR 7/1) sandy loam; massive; very friable; many coarse prominent yellow (10YR 7/6) iron accumulations; strongly acid.
TYPE LOCATION: Sumter County, South Carolina; from SC Highway 120, 2.0 miles west on County Road 33; site is 700 feet northwest of road, 50 feet north of fence, and 50 feet southwest of drainage ditch.
RANGE IN CHARACTERISTICS: Solum thickness is 60 to 72 inches or more. Depth to fragic soil properties is 12 to 36 inches. Depth to a fragipan is 15 to 40 inches. The soil is extremely acid to moderately acid throughout, except in limed areas. Nodules of plinthite totaling less than 5 percent by volume are in some pedons. Some pedons have few to common concretions of ironstone.
The Ap or A horizon has hue of 10YR, value of 2 to 4, and chroma of 1 or 2. It is loam, sandy loam, fine sandy loam, sandy clay loam, or clay loam.
The Eg horizon, where present, has hue of 10YR, value of 6 or 7, and chroma of 1 or 2. It is sandy loam, fine sandy loam, or loam.
The Btg or B'tg horizon has hue of 10YR or 2.5Y, value of 4 to 7, and chroma of 1 or 2 or it is neutral with vale of 4 to 7. Many pedons have masses of iron accumulation in shades of red, yellow, or brown. It is sandy clay loam in the upper part, or it is clay loam, sandy clay, or clay. The lower boundary of most pedons is clear irregular or abrupt irregular with tongues of the Bt horizon that taper with depth and extend into the Btx horizon.
The Btx horizon has hue of 7.5YR or 10YR, value of 5 or 6, and chroma of 4 to 8. Red masses of iron accumulation, or gray iron depletions are in most pedons. This horizon has moderate to strong coarse prismatic structure parting to platy or blocky. It is sandy clay loam, clay loam, or sandy clay.
The BC horizon has hue of 7.5YR or 10YR, value of 5 or 6, and chroma of 4 to 8. Red masses of iron accumulation, or gray iron depletions are in most pedons. It is sandy clay loam, or sandy loam. Most pedons have pockets of gray coarser or finer textures.
The BCg horizon has hue of 10YR or 2.5Y, value of 4 to 7, and chroma of 1 or 2 or it is neutral with vale of 4 to 7. It is sandy clay loam, or sandy loam. Most pedons have pockets of gray coarser or finer textures.
The Cg horizon of most pedons has hue of 10YR or 2.5Y, value of 5 to 7, and chroma of 1 or 2, or is neutral with value of 4 to 8. Most pedons have many masses of iron accumulation in shades of brown, yellow, or red. Some pedons are a combination of iron accumulations and depletions in shades of gray, yellow, brown, or red. It is sandy loam, sandy clay loam, or sandy clay. Some pedons have pockets of coarser or finer textures.
COMPETING SERIES: There are no other known series in this family. Similar series in other families are Argent, Coxville, Gourdin, Rains, Ogeechee, Rembert, Wadmalaw, Williman, and Yemassee. None of these soils except Gourdin exhibits episaturation. Gourdin soils are fine-loamy. In addition, Argent soils have mixed clay mineralogy. Coxville and Rains soils do not have a 20 percent clay decrease within 60 inches of the surface. Wadmalaw soils have an umbric epipedon. Williman soils have an arenic epipedon. Ogeechee and Yemassee soils are fine-loamy.
GEOGRAPHIC SETTING: McColl soils are on nearly level, concave, oval-shaped depressions with no natural drainage outlets. They formed in loamy marine sediments. Near the type location, mean annual rainfall is 47 inches, and mean annual temperature is 64 degrees F.
GEOGRAPHICALLY ASSOCIATED SOILS: In addition to the similar Coxville, Rains, and Rembert soils, these are the Byars, Dunbar, Duplin, Goldsboro, Lynchburg, Noboco, Norfolk, Pantego, and Plummer soils. Byars, Pantego, and Plummer soils do not exhibit episaturation. The remaining soils, except the similar soils, are better drained.
DRAINAGE AND PERMEABILITY: Poorly drained. Surface runoff is very slow or is ponded. Permeability is slow. In undrained areas, the high water table is near or above the surface for as much as 6 months per year.
USE AND VEGETATION: Drained areas are used for growing corn, soybeans, hay, and pasture. Native vegetation is pond pine, blackgum, and baldcypress, with an understory of gallberry, alder, and sedge.
DISTRIBUTION AND EXTENT: North Carolina and South Carolina. The series is of minor extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Raleigh, North Carolina
SERIES ESTABLISHED: Marlboro County, South Carolina; 1963.
REMARKS: Diagnostic horizons and other diagnostic soil characteristics recognized in this pedon are:
Ochric epipedon--the zone from the surface of the soil to a depth of 6 inches (Ap horizon)
Argillic horizon--the zone between a depth of 6 and 42 inches (Bg1, Btg2, Btg/Bx, and Btx horizons)
Fragic soil properties--the zone between a depth of 13 and 42 inches (Btg/Bx and Btx horizons)
Fragipan horizon--the zone between a depth of 23 and 42 inches (Btx horizon)
Aquic conditions--the zone from 6 inches to a depth of 23 inches is periodically saturated (Btg1, Btg2, and Btg/Bx horizons)
MLRA(s): 133A, 137, 153A
SERIES INTERPRETATION RECORD(S): SC0011
TABULAR SERIES DATA:
SOI-5 Soil Name Slope Airtemp FrFr/Seas Precip Elevation SC0011 MCCOLL 0- 2 62- 66 220-240 42- 48 75- 220SOI-5 FloodL FloodH Watertable Kind Months Bedrock Hardness SC0011 NONE +1.0-1.0 PERCHED - >60
SOI-5 Depth Texture 3-Inch No-10 Clay% -CEC- SC0011 0- 9 SL FSL 0- 0 95-100 8-18 1- 4 SC0011 0- 9 SCL CL L 0- 0 95-100 15-35 2- 6 SC0011 9-13 CL SC C 0- 0 95-100 35-60 3- 8 SC0011 13-42 SCL CL SC 0- 0 95-100 25-45 2- 6 SC0011 42-80 SCL SL SC 0- 0 95-100 15-40 1- 6
SOI-5 Depth -pH- O.M. Salin Permeab Shnk-Swll SC0011 0- 9 4.5- 7.3 1.-8. 0- 0 0.6- 2.0 LOW SC0011 0- 9 4.5- 7.3 1.-8. 0- 0 0.6- 2.0 LOW SC0011 9-13 4.5- 5.5 0.-.5 0- 0 0.2- 0.6 LOW SC0011 13-42 4.5- 5.5 0.-.5 0- 0 0.06- 0.2 LOW SC0011 42-80 4.5- 5.5 0.-.5 0- 0 0.2- 2.0 LOW