IDENTIFIERS

Current Taxon Name (Soil Name): Mahan

OSD

Series Extent

User Site ID: S1945LA061001

User Pedon ID: S1945LA061001

Vegetation Plot ID: S1945LA061001

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - SSL

Lab Pedon # - 40A4122

NCSS Pedon Lab Data NASIS Record ID - 40314

Print Date: 5/20/2024

LOCATION

Location In Web Soil Survey

AOI is roughly a square mile and pedon is marked in the center.

Location in SoilWeb

Location in Google Maps

Std. Latitude: 32.5822220

Std. Longitude: -92.5747223

Datum: WGS84

Township: 18N

Range: 2W

Section: 4

Location Description: 3.75 miles NW of Choudrant, in small forested area immediately S of graveled road.

State: Louisiana

County: LA061—Lincoln

MLRA: 133B—Western Coastal Plain

Non-MLRA Soil Survey Area: LA061—Lincoln Parish, Louisiana

PEDON

Describers Name: L.T. Alexander, I.L. Martin, A.E. Shearin, R.W. Simonson, M.B. Sturgis, and E.H. Templin

Current Taxonomic Class: Clayey, kaolinitic, thermic Typic Paleudults

Current Taxon Kind: series

Pedon Record Orgin: Converted from PDP 3.x

Pedon #: 1

Correlated Information:

Soil Name - Mahan

PSC - 15 to 65 cm.

Classificaton Date - 7/23/2007

Moisture Class - udic

Sampled As Information:

Soil Name - UNNAMED

Classificaton Date - 6/22/1945

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

SITE

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 6/22/1945 (actual site observation date)

Surface Cover Properties:

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
CARYA QUAL QUFA RHUS TORA2 ULAL ULAL	Carya Quercus alba Quercus falcata Rhus Toxicodendron radicans Ulmus alata Ulmus alata	hybrid hickory white oak southern red oak sumac eastern poison ivy winged elm winged elm	— — — — — — —	— — — — — — —	— — — — — — —

Setting and Climate
Slope	Slope Length USLE	Upslope Length	Elev.	Corr. Elev	Aspect	MAP	REAP	FFD	MAAT	MSAT	MWAT	MAST	MSST	MWST	MFFP	PE Index	Climate Station ID	Climate Station Name	Climate Station Type
%	m				degrees	mm	mm		C						mm
6	—	—	—	—	0	1270	—	—	18	—	—	—	—	—	—	—	—	—	—

O2—0 to 2 centimeters (0.0 to 0.8 inches); very dark brown (10YR 2/2) coarse sand, partially decomposed organic matter; fragments; diffuse boundary. Lab sample # 40A31493. some sand grains in organic matter; no plant structures are evident in the mass; moist color speckled with light colored grains of coarse sand.

A1—2 to 7 centimeters (0.8 to 2.8 inches); brown (10YR 5/3) and dark grayish brown (10YR 4/2) and brown (10YR 4/3) oxidized, pale brown (10YR 6/3) and very pale brown (10YR 7/3), dry; fine sandy loam; weak fine granular structure; fragments; diffuse boundary. Lab sample # 40A31494. nearly loose; the horizon contains a few small angular ironstone fragments.

A2—7 to 17 centimeters (2.8 to 6.7 inches); brown (10YR 5/3) and strong brown (7.5YR 5/6), light gray (10YR 7/2), dry; fine sandy loam; weak fine granular structure; fragments. Lab sample # 40A31495. nearly loose; cores and small round pockets of very dark grayish brown (7.5YR 5/6) material are common in the upper part of horizon, and few pockets of olive (5YR 5/6) material are present in the lower part; horizon contains numerous small angular ironstone fragments approximately 10 mm on the long axis; lower boundary is distinct.

B21t—17 to 40 centimeters (6.7 to 15.7 inches); red (2.5YR 4/8), red (2.5YR 4/6), dry; clay; moderate fine and medium subangular blocky structure; hard, firm, very plastic; fragments; diffuse boundary. Lab sample # 40A31496. small ironstone fragments are common, especially in upper part; moist red soil is slightly lighter crushed.

B22t—40 to 58 centimeters (15.7 to 22.8 inches); red (2.5YR 4/6) and pale olive (5Y 6/3) clay; red (2.5YR 4/6) fine distinct and pale olive (5Y 6/3) coarse faint mottles; subangular blocky, and moderate fine granular structure; firm, very plastic; fragments; diffuse boundary. Lab sample # 40A31497. many blocks have glossy or slick surfaces; color of soil when dry is the same as that when moist.

B23t—58 to 83 centimeters (22.8 to 32.7 inches); pale yellow (5Y 7/3) and red (2.5YR 4/8) and yellowish red (5YR 5/6) clay; moderate medium subangular blocky parts to weak fine granular structure; firm, very plastic; fragments; diffuse boundary. Lab sample # 40A31498. structure is less distinct than that of the overlying horizon; some blocks have glossy or slick surfaces; the brown colors are dominant in the upper part of the horizon, whereas the yellow is dominant in the lower part; colors of the dry and moist soil are the same.

B3—83 to 124 centimeters (32.7 to 48.8 inches); light gray (5Y 7/2) and red (2.5YR 4/8) and red (2.5YR 5/6) clay; 25 percent red (2.5YR 4/8) fine prominent and 25 percent red (2.5YR 5/6) fine prominent mottles; weak coarse subangular blocky structure; firm, very plastic; fragments. Lab sample # 40A31499. in places the horizon has a speckled appearance; colors do not change as the soil becomes dry; there are some medium and coarse mottles.

C—124 to 167 centimeters (48.8 to 65.7 inches); pale yellow (5Y 7/3) and red (2.5YR 4/8) clay; 10 percent red (2.5YR 4/8) fine prominent mottles; moderate medium and coarse platy structure; firm, very plastic; fragments. Lab sample # 40A31500. the structure is due to the laminated beds of clay, apparently inherited; midway in the horizon there is a band, about 2 inches thick, in which mottlings are numerous as compared to parts above and below it.