LOCATION EGYPTGROVE MOEstablished Series
TAXONOMIC CLASS: Fine-loamy, siliceous, semiactive, mesic Typic Paleudults
TYPICAL PEDON: Egyptgrove gravelly silt loam - on a convex ridge top of 5 percent slope in a hardwood forest of blackjack oak and hickory at an elevation of 1,320 feet. (Colors are for moist soil unless otherwise stated)
Oi--0 to 3 inches; slightly decomposed leaf litter.
A--3 to 8 inches; yellowish brown (10YR 5/4) gravelly silt loam, light yellowish brown (10YR 6/4), dry; weak fine granular structure; friable; common fine and medium roots and a few coarse roots throughout; many very fine, fine and medium irregular pores; 15 percent subrounded chert gravel and 10 percent subrounded sandstone gravel; extremely acid (pH 4.4); clear smooth boundary. (3 to 8 inches thick)
Bt1--8 to 12 inches; 70 percent strong brown (7.5YR 5/6) and 30 percent yellowish brown (10YR 5/8) silt loam; weak fine subangular blocky structure; friable; common medium and a few fine and coarse roots throughout; common very fine, fine and medium irregular and tubular pores; common discontinuous faint strong brown (7.5YR 5/6) clay films on faces of peds; few discontinuous distinct brown (10YR 4/3) organic coats throughout; 10 percent subangular chert gravel; very strongly acid (pH 4.7); clear smooth boundary.
Bt2--12 to 19 inches; strong brown (7.5YR 5/8) gravelly clay loam; weak medium subangular blocky structure; firm; common medium, few fine and very few coarse roots throughout; many very fine, fine and medium irregular and tubular pores; common discontinuous faint yellowish red (5YR 5/8) clay films on faces of peds; 15 percent subangular chert gravel; very strongly acid (pH 4.7); clear smooth boundary. (combined thickness of the Bt horizons is 10 to 30 inches)
2Btd1--19 to 27 inches; 90 percent strong brown (7.5YR 5/8) and 10 percent brownish yellow (10YR 6/8) clay; weak medium subangular blocky structure; firm; very few very fine, fine and medium roots throughout; many fine and medium tubular pores; common discontinuous faint yellowish red (5YR 4/6) clay films on faces of peds; 5 percent subangular chert gravel; extremely acid (pH 4.4); gradual wavy boundary.
2Btd2--27 to 35 inches; 60 percent strong brown (7.5YR 5/8) and 40 percent brownish yellow (10YR 6/8) clay; moderate medium subangular blocky structure; firm; very few very fine, fine and medium roots throughout; common fine and medium tubular pores; common discontinuous distinct red (2.5YR 5/8) clay films on faces of peds; 2 percent subrounded chert gravel; very strongly acid (pH 4.7); clear wavy boundary.
2Btd3--35 to 48 inches; brownish yellow (10YR 6/8) clay; moderate fine angular blocky structure; very firm; very few fine, medium and coarse roots between peds; many fine tubular pores; common discontinuous distinct yellowish red (5YR 5/8) and common discontinuous prominent light gray (10YR 7/1) clay films on faces of peds; very strongly acid (pH 4.8); clear wavy boundary.
3Btd4--48 to 58 inches; brownish yellow (10YR 6/8) clay; weak very coarse prismatic structure parting to moderate fine angular blocky; very firm; very few very fine roots between peds; few fine tubular and few medium vesicular pores; common continuous prominent red (2.5YR 4/8) and few discontinuous prominent light gray (10YR 7/1) clay films on faces of peds; 10 percent subangular chert gravel; very strongly acid (pH 4.6); clear irregular boundary.
3Btd5--58 to 80 inches; 60 percent yellowish red (5YR 5/8) and 40 percent yellow (10YR 7/8) gravelly clay; weak very coarse prismatic structure parting to moderate fine angular blocky; very firm; very few very fine roots between peds; few fine tubular pores; common continuous prominent red (2.5YR 4/8) and common continuous prominent light gray (10YR 7/1) clay films on faces of peds; few continuous prominent black (N 2/0) coatings of iron and maganese oxides on faces of peds; 20 percent subangular and subrounded chert gravel; very strongly acid (pH 4.7). (Combined thickness of the Btd horizon is 40 inches or more)
TYPE LOCATION: Howell County, Missouri; about 3 miles north of Pomona, Missouri; 1,600 feet north and 800 feet west of the SE corner of section 27, T. 26 N., R. 9 W; USGS Willow Springs South quadrangle; UTM coordinates, Zone 15, Easting: 596700, Northing: 4083780.
RANGE IN CHARACTERISTICS:
Solum thickness: 80 or more inches
Depth to bedrock: more than 80 inches
Depth to the 2Btd horizon: 13 to 38 inches
A or Ap horizon
Hue: 10YR
Value: 3 to 6
Chroma: 2 to 4
Texture: silt loam
Rock fragments: 0 to 50 percent gravel, 0 to 10 percent cobbles
Reaction: slightly acid to extremely acid
Bt horizon
Hue: 10YR or 7.5YR
Value: 4 or 5
Chroma: 3 to 8
Texture: silt loam, silty clay loam, loam, clay loam
Rock fragments: 0 to 30 percent gravel, 0 to 5 percent cobbles
Reaction: moderately acid to extremely acid
2Btd & 3Btd horizon
Hue: 10YR to 2.5YR
Value: 4 to 6
Chroma: 4 to 8
Texture: clay, silty clay
Rock fragments: 0 to 30 percent gravel, 0 to 10 percent cobbles or flagstones
Reaction: strongly acid to extremely acid
Some pedons may have a transitional horizon (BE, BA, or AB) above the argillic horizon with properties similar to the A horizon.
COMPETING SERIES: These are the Cottonbend, Fanchon, McClung, Nolichucky, Taterhill, Topazmill, Trimble, and Wyrick series. These soils do not have a Btd horizon.
GEOGRAPHIC SETTING: Egyptgrove soils are on ridge tops, shoulder slopes and side slopes. Slopes range from 3 to 15 percent. These soils formed in silty colluvium and the underlying residuum weathered from decomposing post-Ordivician age mudstone. Elevations are commonly 700 to 1500 feet. Mean annual temperature ranges from 54 to 58 degrees F., and the mean annual precipitation varies from 40 to 45 inches.
GEOGRAPHICALLY ASSOCIATED SOILS: These are Kenaga, Poynor, Scholten, Tick, and Tonti soils. Kenaga soils are moderately well drained and are on similar positions. Poynor soils are loamy-skeletal over clayey and are on side slopes. Scholten and Tonti soils have fragipans and are on similar positions. Tick soils are fine textured and are also on similar landscape positions as Egyptgrove.
DRAINAGE AND PERMEABILITY: Well drained. Runoff is low to high. Permeability is slow, and the hydraulic conductivity is moderately low.
USE AND VEGETATION: These soils are used mainly for pasture, hay and timber. Native vegetation is mixed hardwoods.
DISTRIBUTION AND EXTENT: The Ozark Highlands region (MLRA 116A) of southern Missouri and possibly northern Arkansas. This series is of moderate extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Morgantown, West Virginia
SERIES ESTABLISHED: Howell County, Missouri, 2004. The name is from a town in the county.
REMARKS: Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon - the zone from the surface to a depth of 8 inches. (A horizon).
Argillic horizon - the zone from 8 to 80 inches (Bt, 2Btd, and 3Btd horizons).
Densic properties - the zone from 19 to 80 inches (2Btd horizons).
This soil is being mapped predominantly in what is believed to be the Cheltenham formation (Pennsylvanian age) in Missouri.
Sampled for the University of Missouri Soil Characterization Lab as M0009103 (Macedonia Variant).