LOCATION GLENWILD LAEstablished Series
TAXONOMIC CLASS: Fine-silty, mixed, superactive, hyperthermic Oxyaquic Hapludalfs
TYPICAL PEDON: Glenwild silty clay loam - cropland. (Colors are for moist soil).
Ap--0 to 4 inches; brown (7.5YR 4/3) silty clay loam; weak medium subangular blocky structure; friable; common very fine and fine roots; few medium roots; few very fine and fine pores; very few faint dark brown (7.5YR 3/3) stains on faces of peds; moderately acid; clear smooth boundary (3 to 12 inches thick)
Bt1--4 to 10 inches; red (2.5YR 4/6) silty clay loam; moderate medium subangular blocky structure; firm; few fine and medium roots; few very fine tubular pores; few distinct dark red (2.5YR 3/6) clay films on faces of peds and in pores; few distinct very dark gray (10YR 3/1) organic coats in root channels and in pores; common fine prominent very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation throughout; neutral; clear smooth boundary.
Bt2--10 to 17 inches; red (2.5YR 4/6) silt loam; weak medium subangular blocky structure; friable; few very fine and fine roots; common very fine and fine tubular pores; few distinct dark red (2.5YR 3/6) clay films on faces of peds and in pores; very few faint very pale brown (10YR 7/4) silt coats on faces of peds; few distinct very dark gray (10YR 3/1) organic coats in root channels and in pores; common fine prominent very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation throughout; slightly alkaline; gradual smooth boundary.
Bt3--17 to 22 inches; red (2.5YR 5/8) silt loam; weak medium subangular blocky structure; friable; few very fine and fine roots; few medium tubular pores; many very fine and fine tubular pores; few distinct reddish brown (2.5YR 4/4) clay films on faces of peds and in pores; very few distinct dark brown (10YR 3/3) organic coats in root channels and in pores; common fine and medium distinct reddish yellow (7.5YR 6/6) masses of iron accumulation between peds; moderately alkaline; clear smooth boundary (combined thickness of the Bt horizon is 12 to 36 inches).
2Btk--22 to 30 inches; red (2.5YR 4/6) to brown (7.5YR 4/2) thickly stratified silty clay loam, silty clay, and silt loam (individual strata are 2 to 4 inches thick); moderate medium subangular blocky structure; very firm; few very fine and fine roots; few very fine and fine tubular pores; few distinct clay films on faces of peds and in pores; few distinct very pale brown (10YR 7/4) silt coats on faces of peds; few fine masses of iron-manganese accumulation throughout; few fine and medium hard calcium carbonate concretions; moderately alkaline; clear wavy boundary (0 to 4 inches thick).
2BCk--30 to 35 inches; strong brown (7.5YR 4/6) silt loam; weak medium angular blocky structure; friable; few very fine and fine roots; common very fine and fine tubular pores; very few distinct brown (7.5YR 4/3) clay films on faces of peds and in pores; very few faint pink (7.5YR 7/4) silt coats on faces of peds; few fine prominent very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation throughout; common fine and medium distinct brown (7.5YR 4/4) masses of iron accumulation throughout; few fine and medium prominent light yellowish brown (2.5Y 6/3) iron depletions throughout; few fine and medium slightly hard calcium carbonate concretions throughout; moderately alkaline; clear smooth boundary.
2C1--35 to 42 inches; brown (7.5YR 5/4) silt loam; massive; very friable; few very fine and fine roots; few very fine and fine tubular pores; very few distinct brown (7.5YR 4/3) clay films around root channels and in pores; common fine and medium prominent strong brown (7.5YR 5/8) masses of iron accumulation throughout; few fine distinct very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation throughout; moderately alkaline; clear smooth boundary.
3C2--42 to 45 inches; red (2.5YR 4/6) silty clay; moderate medium platy structure; firm; few very fine and fine roots; few very fine tubular pores; few distinct light reddish brown (5YR 6/4) silt coats on bottoms of plates; common fine prominent weak red (2.5YR 5/2) iron depletions throughout; common fine prominent very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation between plates; moderately alkaline; clear smooth boundary.
3Ck--45 to 52 inches; reddish brown (5YR 5/3) silty clay; weak fine platy structure; firm; few very fine and fine roots; few very fine tubular pores; common fine hard calcium carbonate concretions throughout; common fine and medium prominent grayish brown (2.5Y 5/2) iron depletions throughout; common fine and medium prominent light olive brown (2.5Y 5/6) masses of iron accumulation throughout; few fine distinct very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation between plates; few coarse prominent red (2.5YR 4/8) strata; moderately alkaline; clear smooth boundary.
3C'--52 to 63 inches; red (2.5YR 4/6) silty clay loam; weak fine platy structure; firm; few very fine and fine roots; few very fine and fine tubular pores; common fine and medium prominent grayish brown (2.5Y 5/2) iron depletions between peds; few fine slightly hard iron-manganese concretions between peds; moderately alkaline; clear smooth boundary.
3Ck'1--63 to 67 inches; stratified grayish brown (2.5Y 5/2) and red (2.5YR 4/6) silt loam; weak fine platy structure; friable; few very fine and fine roots; few very fine and fine tubular pores; common fine and medium hard calcium carbonate concretions throughout; common fine and medium prominent strong brown (7.5YR 5/8) masses of iron accumulation throughout; few fine distinct very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation throughout; moderately alkaline; clear smooth boundary.
3Ck'2--67 to 79 inches; light brown (7.5YR 6/3) silt loam; massive structure grading to weak fine platy in the lower part; very friable; few fine roots; few very fine and fine tubular pores; very few prominent red (2.5YR 4/6) clay films in root channels and in pores; many fine and medium prominent yellowish brown (10YR 5/8) to strong brown (7.5YR 5/8 and 7.5YR 4/6) masses of iron accumulation throughout; common fine and medium faint grayish brown (10YR 5/2 and 2.5Y 5/2) iron depletions throughout; few fine prominent very dark grayish brown (10YR 3/2) masses of iron-manganese accumulation between plates in the lower part; few fine slightly hard calcium carbonate concretions throughout; moderately alkaline; gradual smooth boundary.
TYPE LOCATION: St. Mary Parish, Louisiana; 34.5 miles west of Morgan City on U.S. Hgy. 90, then 1.7 miles north on State Road 671 and 200 yards west on State Road 182 to the center of town in Jeanerette, La., then 500 yards north on Rightway Road across bridge to State Road 87, then 7.5 miles east on State Road 87, then 100 yards north on field road, and 40 yards east to edge of cane rows; Spanish Land Grant sec. 31, T. 13 S., R. 9 E.; USGS Charenton, La. quadradrangle; Latitude 29 degrees, 52 minutes, 43.01 seconds N., Longitude 91 degrees, 33 minutes, 04.02 seconds W., NAD 83.
RANGE IN CHARACTERISTICS: Solum thickness is 30 to 60 inches. Depth to a discontinuity ranges from 20 to 60 inches. A clayey layer more than 4 inches thick is between depths of 40 and 60 inches. Clayey strata 1 to 4 inches thick are in most pedons between depths of 20 and 40 inches. Reaction is moderately acid to neutral in the A horizon, moderately acid to moderately alkaline in the Bt horizon, and neutral to strongly alkaline in the 2Btk, 2BC and C horizons.
The A or Ap horizon has hue of 7.5YR or 10YR, value of 4 or 5, and chroma of 2 to 4. Texture is very fine sandy loam, silt loam, or silty clay loam.
The Bt horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 8; or it has hue of 2.5YR or 5YR, value of 3, and chroma of 3 or 4. Texture is silt loam, loam, clay loam, or silty clay loam.
The 2Btk horizon has hue of 2.5YR to 7.5YR, value of 4 or 5, and chroma of 4 to 8. Texture is silty clay loam or silty clay. Calcium carbonate concretions range from few to common.
The 2BCk horizon, where present, has hue of 5YR to 10YR, value of 4 or 5, and chroma of 4 to 6. Texture is silt loam or silty clay loam. Calcium carbonate concretions range from few to common.
The C and Ck horizons consist of stratified layers and lenses of very fine sandy loam, silt loam, silty clay loam, clay and silty clay. Structure is platy or massive. Hues in the individual strata range from 2.5YR to 2.5Y, with value of 4 to 6, and chroma of 2 to 6. Calcium carbonate concretions range from none to common.
COMPETING SERIES: There are no other series in the same family.
GEOGRAPHIC SETTING: Glenwild soils are on nearly level to gently sloping natural levees on the Teche delta plain of the Mississippi River. Slope gradients range from 0 to 5 percent. The soils formed in reddish silty and clayey stratified alluvium deposited in former channels along Bayou Teche and the lower parts of the Achafalaya River. The climate is humid subtropical. Mean annual rainfall ranges from 48 to 60 inches and mean annual temperature ranges from 70 degrees to 73 degrees F. Elevation ranges from 5 to 30 feet. Frost free days range from 290 to 330.
GEOGRAPHICALLY ASSOCIATED SOILS: These are the Baldwin, Iberia, and Galvez series. Baldwin soils are on mid-slope positions between the natural levee and backswamps. Iberia soils are on backswamp positions. These soils formed in black to gray sediments and are clayey throughout. Galvez soils are on similar positions as the Glenwild soils and formed in more grayish sediments.
DRAINAGE AND PERMEABILITY: Moderately well drained; Runoff is negligible on 0 to 1 percent slope, very low on 1 to 3 percent slopes, and low on 3 to 5 percent slopes. Permeability is moderately slow. The soil has a saturated layer beginning at 24 to 40 inches deep that is perched above the clayey strata for more than 30 cumulative days during normal years.
USE AND VEGETATION: Most areas are used for cropland. Sugarcane, sorghum, soybeans, small grain, or corn are the main crops. Some areas are used for improved pasture. Native vegetation was mixed hardwood forest.
DISTRIBUTION AND EXTENT: Southern Mississippi Valley Alluvium (MLRA 131) in South Central Louisiana; the series is of small extent.
MLRA SOIL SURVEY REGIONAL OFFICE (MO) RESPONSIBLE: Temple, Texas
SERIES PROPOSED: St. Mary Parish, Louisiana; 1999.
REMARKS: These soils formerly were included in the Gallion series.
Diagnostic horizons and features recognized in this pedon are:
Ochric epipedon...........0 to 4 inches (Ap horizon)
Argillic horizon..........4 to 30 inches (Bt and 2Btk horizons)
Secondary carbonates......22 to 35 inches (2Btk and 2BCk horizons)
Lithologic discontinuity..at 22 inches deep (top of the 2Btk horizon)
ADDITIONAL DATA: Laboratory data from the typical pedon by NSSL, Lincoln, Ne. (S98-LA101-005)
Taxonomic version: Keys to Soil Taxonomy, Eight Edition, 1998.