LOCATION MARQUEZ TXEstablished Series
TAXONOMIC CLASS: Fine, mixed, semiactive, thermic Typic Haplustults
TYPICAL PEDON: Marquez very fine sandy loam--on east facing convex 2 percent slope in pasture; elevation is 448 feet. (Colors are for dry soil unless otherwise stated.)
A--0 to 7 inches; light yellowish brown (10YR 6/4) very fine sandy loam, dark yellowish brown (10YR 4/4) moist; weak fine granular structure; slightly hard, friable; many fine roots; about 2 percent by volume ironstone gravel; very strongly acid; clear smooth boundary. (3 to 8 inches thick)
E--7 to l3 inches; brownish yellow (10YR 6/6) very fine sandy loam, light yellowish brown (10YR 6/4) moist; weak fine granular structure; soft, very friable; many fine roots; about 7 percent ironstone gravel; strongly acid; clear smooth boundary. (2 to 8 inches thick)
Bt1--l3 to 24 inches; reddish yellow (5YR 6/6) clay, yellowish red (5YR 5/6) moist; strong fine and medium angular blocky structure; very hard, very firm; common fine roots; common medium pores, common distinct clay films on surfaces of peds; about 2 percent ironstone gravel; strongly acid; clear wavy boundary. (7 to 20 inches thick)
Bt2--24 to 42 inches; variegated matrix with 50 percent yellowish red (5YR 5/8) and 50 percent red (2.5YR 4/8) clay; moderate and strong medium angular blocky structure; very hard, very firm; few fine roots; common medium pores; common distinct clay films on surfaces of peds; about 2 percent ironstone gravel; strongly acid; gradual wavy boundary. (l0 to 20 inches thick)
BCt--42 to 50 inches; variegated matrix with 35 percent light gray (10YR 7/2), 35 percent red (2.5YR 5/6), and 30 percent brownish yellow (10YR 6/8) clay; weak medium angular blocky structure; hard, firm; few distinct clay films on surfaces of peds; few fine flakes of mica; about 2 percent ironstone gravel; very strongly acid; gradual wavy boundary. (5 to l5 inches thick)
Cd1--50 to 65 inches; stratified red (2.5YR 5/8) and light gray (10YR 7/2) clay loam and weakly cemented sandstone that can be cut with spade; hard, firm; few fine flakes of mica; about 1 percent ironstone gravel; very strongly acid; gradual smooth boundary.
Cd2--65 to 80 inches; stratified red (2.5YR 5/8) and light gray (10YR 7/2) very fine sandy loam and weakly cemented sandstone that can be cut with spade; hard, firm; few fine flakes of mica; about 1 percent ironstone gravel; very strongly acid. (Combined thickness of the Cd horizon is 20 to 40 inches)
TYPE LOCATION: Leon County, Texas; from intersection of U. S. Highway 79 and County Road 336 in Jewett, 2.3 miles northwest and north on County Road 336, 0.5 mile east and 400 feet south on private road, 50 feet east in pasture. Donie, Texas USGS 7.5 Minute Quadrangle; Latitude: 31 degrees, 23 seconds, 20.00 minutes North; Longitude: 96 degrees, 09 minutes, 35.00 seconds West; NAD 83.
RANGE IN CHARACTERISTICS:
Soil Moisture: an ustic moisture regime bordering on udic. The soil moisture control section is dry in some or all parts more than 90 but less than 110 cumulative days in normal years.
Solum thickness: ranges from 40 to 60 inches.
Base saturation: 50 inches below the top of the argillic horizon or immediately above the Cd horizon ranges from 15 to 35 percent.
Mean annual soil temperature: 68 to 70 degrees F.
Depth to abrupt textural change: 5 to 16 inches
Depth to albic horizon: 3 to 8 inches
Depth to argillic horizon: 5 to 16 inches
Particle-size control section (weighted average)
Clay content: 35 to 60 percent
Coarse Fragments: 0 to 10 percent
CEC/clay ratio: 0.24 to 0.40 (semiactive)
A horizon
Hue: 5YR, 7.5.YR, or 10YR
Value: 4 to 6
Chroma: 2 to 4
Texture: Fine sandy loam, very fine sandy loam, gravelly fine sandy loam, or gravelly loamy fine sand
Coarse fragments: 0 to 35 percent
Reaction: Very strongly acid to slightly acid
E horizon
Hue: 5YR, 7.5YR, or 10YR
Value: 5 to 8
Chroma: 3 to 6
Texture: Fine sandy loam, very fine sandy loam, gravelly fine sandy loam, or gravelly loamy fine sand
Coarse fragments: 0 to 35 percent
Reaction: Very strongly acid to slightly acid
Bt horizon
Hue: 2.5YR or 5YR
Value: 4 to 6
Chroma: 6 to 8
Texture: Clay, sandy clay, or clay loam
Redoximorphic features: Red, yellow or brown iron concentrations and relic gray mottles inherited from the partially weathered gray shale or claystone, range from none to few in the upper part and few to many in the lower part in some pedons
Coarse fragments: 0 to 10 percent
Reaction: Extremely acid to strongly acid
BCt horizon
Hue: 2.5YR, 5YR, 7.5YR or 10YR
Value: 5 to 7
Chroma: 2 to 8
Redoximorphic features: Red, yellow or brown iron concentrations and relic gray mottles inherited from the partially weathered gray shale or claystone, range from none to few in the upper part and few to many in the lower part in some pedons
Texture: Sandy clay loam, clay loam, or clay
Coarse fragments: 0 to 10 percent
Reaction: Extremely acid or very strongly acid
Cd horizon
Hue: 2.5YR, 5YR, 7.5YR or 10YR
Value: 5 to 7
Chroma: 2 to 8
Redoximorphic features: None
Texture: very fine sandy loam, fine sandy loam, or sandy clay loam in the sandstone materials, and clay loam or clay in the shale or claystone materials. The amount of sandstone or shale is variable and either may be absent in some pedons.
Other features: Roots penetrate the materials but are concentrated along fractures or cleavage planes. A few mica flakes are in most pedons typically between plates of shale or claystone. Most pedons have clay flows and films along vertical fractures.
Coarse fragments: 0 to 5 percent
Base saturation: 15 to 35 percent
Reaction: Extremely acid to strongly acid
COMPETING SERIES: These are the
Aubrey (TX),
Hearne (TX),
Rek (TX), and
Stein (TX) series in the same family. Similar soils are the
Birome (TX),
Cuthbert (TX),
Galilee (TX),
Kirvin (TX),
Newco (TX),
Rosanky (TX), and
Urland (TX) series.
Aubrey soils: do not have mica flakes in the lower profile, have sola 20 to 40 inches thick, and have developed in Cretaceous age parent materials.
Birome and Rosanky soils: have base saturation of more than 35 percent.
Cuthbert, Galilee, Kirvin, Newco, and Urland soils: are moist in the moisture control section for longer periods of time.
Hearne soils: have sola 20 to 40 inches thick.
Rek soils: have a paralithic contact within a depth of 60 to 80 inches.
Stein soils: do not have a Cd horizon within 80 inches.
GEOGRAPHIC SETTING:
Parent material: acid stratified loamy and clayey sediments derived from primarily the Reklaw Formation of Tertiary age.
Landform: low rounded hills or summit and shoulder of ridgetops
Slope: 1 to 5 percent
Mean annual air temperature range: 65 to 67 degrees F
Mean annual precipitation range: 33 to 40 inches
Precipitation pattern: May through June, and October are the wettest months, while July and August are the driest months.
Frost-free period: 210 to 260 days
Elevation: 350 to 600 feet
Thornthwaite annual P-E indices: 48 to 68
GEOGRAPHICALLY ASSOCIATED SOILS: These are the
Gasil (TX),
Hearne (TX),
Padina (TX),
Silstid (TX), and
Robco (TX) series.
Gasil soils: have fine-loamy control section and are on slightly lower landscape positions.
Hearne soils: are on narrow ridgetops and steep sideslopes.
Padina and Silstid soils: are on smooth broad areas in positions slightly higher, and have thick sandy surface areas.
Robco soils: are on concave positions slightly lower in the landscape, have sandy surface layers, and contain gray depletions due to wetness.
DRAINAGE AND PERMEABILITY: Well drained; Permeability is slow. Runoff is high.
USE AND VEGETATION: Used for pasture or rangeland grazing. Pastures are commonly hybrid bermudagrass or bahiagrass. Native vegetation is savannah that consists of mostly post oak and blackjack oak with an understory of little bluestem, yellow indiangrass, and longleaf uniola. (Sandy Loam range site, PE 48-68, R087AY237TX.
DISTRIBUTION AND EXTENT: East Central Texas; Land Resource J, Southwestern Prairies; MLRA 87A, Southern Claypan Prairie; the series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES ESTABLISHED: Leon County, Texas l985. The name is from a community near the type location.
REMARKS: This soil was formerly included with the Kirvin or Rosanky soils. The series was separated from the Rosanky series based on lower base saturation, and from the Kirvin series because the series province is in the udic moisture regime.
Diagnostic horizons or features recognized in this pedon are:
Particle size control section: 13 to 33 inches. (Bt1 and Bt2 Horizon)
Ochric epipedon: 0 to 13 inches. (A and E horizons)
Albic horizon: 7 to 13 inches. (E horizon)
Argillic horizon: 13 to 42 inches. (Bt1, Bt2, and BCt horizons)
Abrupt textural change: At the upper boundary of the Bt horizon.
Depth to Densic Contact: At the upper boundary of the Cd horizon.
The assignment of the cation-exchange activity class is supported by laboratory data number S82TX-289-025 from Leon County, Texas.
ADDITIONAL DATA: NSSL Data S82TX-289-25 from the type location for the series.
TAXONOMIC VERSION: Keys to Soil Taxonomy, Ninth Edition, 2003