LOCATION MOLLCO TX

Established Series
GWC-CLN-RM
07/2014

MOLLCO SERIES

The Mollco series consists of very deep, very poorly drained, moderately slowly permeable soils that formed in loamy fluviomarine deposits of the Beaumont Formation. These soils are in depressional areas with slope less than 1 percent. Mean annual temperature is about 20.0 degrees C (68 degrees F), and mean annual precipitation is about 1422 mm (56 in).

TAXONOMIC CLASS: Fine-loamy, siliceous, superactive, thermic Typic Glossaqualfs

TYPICAL PEDON: Mollco fine sandy loam--woodland. (Colors are for moist soil unless otherwise stated.)

A--0 to 8 cm, (0 to 3 in); very dark grayish brown (10YR 3/2) fine sandy loam; weak medium granular structure; loose, nonsticky, nonplastic; many fine roots; many fine roots; 0.5 in of leaf litter on surface; very strongly acid; clear smooth boundary. (5 to 15 cm [2 to 6 in] thick)

Eg1--8 to 25 cm, (3 to 10 in); gray (5Y 6/1) fine sandy loam; weak medium granular structure; soft, very friable, nonsticky, nonplastic; few fine roots; many very fine tubular pores prominent strong brown (7.5YR 5/6) iron accumulations along root channels; extremely acid; clear smooth boundary.

Eg2--25 to 41 cm, (10 to 16 in); gray (5Y 6/1) fine sandy loam; weak medium granular structure; soft, very friable, nonsticky, nonplastic; few fine roots; common fine tubular pores; extremely acid; clear smooth boundary. (combined Eg subhorizons are 15 to 38 cm [6 to 15 in] thick)

Btg/E1--41 to 56 cm, (16 to 22 in); gray (5Y 6/1) sandy clay loam; weak coarse prismatic structure parting to weak medium subangular blocky; friable, firm, slightly sticky, slightly plastic; few fine roots; few fine pores; few distinct clay films; common fine distinct light gray (N 7/0) iron depletions on surface of peds; about 15 percent gray (5Y 6/1) albic material (E); extremely acid; gradual smooth boundary.

Btg/E2--56 to 97 cm, (22 to 38 in); greenish gray (5BG 6/1) sandy clay loam, gray (5Y 6/1) upon exposure to air; moderate coarse prismatic structure parting to weak fine angular blocky; friable, firm, slightly sticky, slightly plastic; few fine roots; few fine tubular pores; few distinct clay films; common fine and medium prominent strong brown (7.5YR 5/6) iron accumulations inside peds; about 20 percent greenish gray (5BG 6/1) albic materials (E), gray (5Y 6/1) upon exposure to air; extremely acid; gradual smooth boundary.

Btg/E3--97 to 157 cm, (38 to 62 in); gray (5Y 6/1) sandy clay loam; moderate coarse prismatic structure parting to weak fine angular blocky; friable, firm, slightly sticky, slightly plastic; few fine roots; few very fine tubular pores; few distinct clay films; common fine and medium prominent strong brown (7.5YR 5/6) iron accumulations inside peds; about 35 percent gray (5Y 6/1) albic materials (E); extremely acid; gradual smooth boundary.

Btg/E4--157 to 203 cm, (62 to 80 in); gray (5Y 6/1) sandy clay loam; moderate coarse prismatic structure parting to weak fine angular blocky; friable, firm, slightly sticky, slightly plastic; few fine roots; few very fine tubular pores; few distinct clay films; common fine and medium prominent brown (7.5YR 5/4) iron accumulations inside peds; about 40 percent gray (5Y 6/1) albic materials (E); extremely acid. (combined thickness of Btg/E subhorizons is 152 to 178 cm [60 to 70 in])

TYPE LOCATION: Jefferson County, Texas; from the intersection of Farm Road 365 and Interstate Highway 10 about 14 miles southwest of Beaumont; 2.0 miles west on Farm Road 365, 2.0 miles north on private road and 100 ft east of road in forest. USGS topographic quadrangle: Fannett West; Latitude 29 degrees, 57 minutes, 20 seconds N; Longitude 94 degrees, 17 minutes, 39 seconds W; WGS84

RANGE IN CHARACTERISTICS:
Soil Moisture: An aquic soil moisture regime.
Mean annual soil temperature: 20.6 to 21.7 degrees C (69 to 71 degrees F)
Particle-size control section (weighted average)
Clay content: 18 to 30 percent

A Horizon
Hue: 10YR, 2.5Y, or N/
Value: 3 to 5
Chroma: 1 or 2
Texture: fine sandy loam
Redox concentrations: amount-none to common, shades-brown
Redox depletions: amount-none to common, shades-gray
Reaction: extremely acid to strongly acid

Eg Horizon
Hue: 10YR, 2.5Y, 5Y, or N/
Value: 4 to 7
Chroma: 1 or 2
Texture: fine sandy loam or loam
Redox concentrations: amount-none to common, shades-brown
Redox depletions: amount-none to common, shades-gray
Reaction: extremely acid to strongly acid

Btg/E Horizon (middle and lower part)
(Btg)
Hue: 10YR, 2.5Y, 5Y, 5BG, or N/
Value: 5 to 7
Chroma: 1 or 2
(E part, which makes up 20 to 45 percent of horizon)
Hue: 10YR, 2.5Y, 5Y, 5BG, 5G, or N/
Value: 6 or 7
Chroma: 1
Texture: loam, sandy clay loam, or clay loam
Redox concentrations: amount-few to common, shades-brown or yellow
Redox depletions: amount-none to common, shades-gray
Reaction: extremely acid to slightly acid.

(Btg)
Hue: 10YR, 2.5Y, 5Y, 5BG, or N/
Value: 5 to 7
Chroma: 1 or 2
(E part, which makes up 15 to 40 percent of horizon)
Hue: 10YR, 2.5Y, 5Y, 5BG, 5G, or N/
Value: 6 or 7
Chroma: 1
Texture: loam or sandy clay loam
Redox concentrations: amount-few to common, shades-brown or yellow
Redox depletions: amount-none to common, shades-gray
Reaction: extremely acid to slightly acid.

COMPETING SERIES: There are no series in the same family. Similar soils are the Colita, Derly, Evadale, Mollville, Vimville, and Waller soils.

Colita soils: paralithic contact at a depth of 102 to 152 cm (40 to 60 in)
Derly, Evadale, Mollville, Vimville and Waller soils: are poorly drained. In addition, Derly soils have a fine particle-size control section.

GEOGRAPHIC SETTING:
Parent material: loamy fluviomarine deposits derived from igneous, metamorphic and sedimentary rock from the Beaumont Formation
Landscape: open depressions on strand plains
Landform: flat coastal plains
Slope: 0 to 1 percent
Mean annual air temperature range: 19.5 to 20.6 degrees C (67 to 69 degrees F)
Mean annual precipitation range: 1219 to 1524 mm (48 to 60 in)
Precipitation Pattern: Rainfall is generally uniform throughout the year with slight peaks in the spring and fall.
Frost-free period: 240 to 300 days
Elevation: 3.0 to 22.9 m (10 to 75 ft)

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Craigen soils.
Craigen soils: have a sandy surface layer; moderately well drained on are on the relic dune adjacent to the Mollco soils

DRAINAGE AND PERMEABILITY: Very poorly drained. Moderately slowly permeable. Runoff is negligible. The soil is ponded to 0.5 ft above the soil surface for 4 to 8 months during most years.

USE AND VEGETATION: Mainly used for wildlife land or hardwood forest of water oak, red maple, and cypress. Understory is mainly bluestem, sedge, panicum, paspalum, Carolina jointail, and rush.

DISTRIBUTION AND EXTENT: Southeast Texas; Land Resource Region- T; MLRA 152B (Western Gulf Coast Flatwoods. The series is of minor extent.

MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas

SERIES ESTABLISHED: Jefferson County, Texas; 1996. The name is coined.

REMARKS: These soils were formerly included with the Byars series.

Diagnostic horizons and features recognized in this pedon are:

Ochric epipedon 0 to 41 cm (0 to 16 in) (A, E1, and E2 horizons).
Argillic horizon 41 to 203 cm (16 to 80 in) (Btg/E1, Btg/E2, Btg/E3, and Btg/E4 horizons).
Glossic horizon 41 to 203 cm (16 to 80 in) (same as argillic horizons).
Aquic soil conditions 0 to 203 cm (0 to 80 in) in normal years.
Reduced matrix 56 to 97 cm (22 to 38 in) (Btg/E2 horizon).

Additional Comments: The Winnie series is similar but is correlated in MLRA 150A.

ADDITIONAL DATA: Soil survey office lab data available on the type location.

Taxonomic Version: Keys to Soil Taxonomy, Eleventh Edition, 2010

National Cooperative Soil Survey
U.S.A.