IDENTIFIERS

Current Taxon Name (Soil Name): Duffau

OSD

Series Extent

Local Phase: loamy fine sand

User Site ID: S2017TX497049

User Pedon ID: S2017TX497049

Vegetation Plot ID: S2017TX497049

Lab Information:

Certified Lab Pedon Description - yes

Lab Source ID - KSSL

Lab Pedon # - 17N0661

User Project ID: CLBJ_011_NEON

Project Name: LBJ National Grassland

Print Date: 12/7/2025

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: 33.4133100

Std. Longitude: -97.6359900

Datum: WGS84

Map Unit: WeC—Duffau-Windthorst complex, 1 to 5 percent slopes, moderately eroded

Country: US—United States

State: Texas

County: TX497—Wise

MLRA: 84B—West Cross Timbers

Non-MLRA Soil Survey Area: TX497—Wise County, Texas

7.5 Minute USGS Quad: 33097-D6—Smyrna, Texas

PEDON

Describers Name: Sidney Paulson

Current Taxonomic Class: Coarse-loamy, siliceous, active, thermic Ultic Paleustalfs

Current Taxon Kind: taxadjunct

Pedon Type: taxadjunct to the series

Pedon Purpose: laboratory sampling site

Pedon Record Orgin: NASIS

Sampled As Information:

Soil Name - Duffau

Taxonomic Class - Fine-loamy, siliceous, active, thermic Udic Paleustalfs

Taxon Kind - series

PSC - 39 to 89 cm.

Classificaton Date - 4/4/2017

Classifier - Chance M. Robinson

Soil Taxonomic Edition - twelfth edition

Moisture Class - ustic

Moisture SUBClass - udic

Dynamic Soil Properties:

Erosion Class - 1

Pedoderm Loose Cover Indicator - no

Hydric: no

Certification Status: certified

QC Status: level 1

QA Status: level 1

SITE

Parent Material: residuum weathered from sandstone

Landscape: undulating very low hills

Landform: moderately dissected ridge

Geomorphic Component Hills: side slope

Hill Slope Profile: backslope

Slope Position: middle third

Slope Shape Across: linear

Slope Shape Down: linear

Drainage Class: well

Bedrock: sandstone and siltstone

Geology: Paluxy member of the Antlers formation in the Trinity group.

Surface Fragments:

Benchmark Soil?: no

RaCA Information:

RaCA Site ID - CLBJ_049

DSP Plot ID - SW

Plot Baseline Azimuth - 2

Plot Baseline Length - 16

Plot Width - 40

Plot/Site Set Up By - Center of pit

Plot or Site Recorder - Alan Deubler

VEGETATION

SITE OBSERVATION

Observation Date: 4/4/2017 (actual site observation date)

Data Collector: Alan Deubler

Surface Cover Properties:

Site Obs. Cover Kind 1 - grass/herbaceous cover

Site Obs. Cover Kind 2 - rangeland, savanna

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
DIOLS JUVI QUMA3 QUST RHCOL2 SCSC SMILA2 TRFL2	Dichanthelium oligosanthes var. scribnerianum Juniperus virginiana Quercus marilandica Quercus stellata Rhus copallinum var. latifolia Schizachyrium scoparium Smilax Tridens flavus	Scribner's rosette grass eastern redcedar blackjack oak post oak winged sumac little bluestem greenbrier purpletop tridens	— — — — — — — —	— — — — — — — —	— — — — — — — —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon abrupt textural change argillic horizon redox concentrations	0—39 39—39 39—155 155—212	—39— —0— —116— —57—

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	—	—	305	—	279	1011	—	221	17	27.1	6.5	—	—	—	—	—	412334	Decatur, TX	Coop

A—0 to 20 centimeters (0.0 to 7.9 inches); brown (7.5YR 4/4), dark brown (7.5YR 3/4), moist; loamy fine sand; 5 percent clay; weak fine subangular blocky structure; soft, very friable; many (5.0) very fine roots throughout and common (1.0) medium roots throughout and common (2.0) fine roots throughout; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03328; moist when described; observed in pit, small

E—20 to 39 centimeters (7.9 to 15.4 inches); strong brown (7.5YR 5/6), strong brown (7.5YR 4/6), moist; loamy fine sand; 6 percent clay; weak fine subangular blocky structure; soft, very friable; common (3.0) very fine roots throughout and common (1.0) medium roots throughout and common (1.0) fine roots throughout; fragments; noneffervescent, by hcl, 1n; clear wavy boundary. Lab sample # 17N03329; moist when described; observed in pit, small

Bt1—39 to 68 centimeters (15.4 to 26.8 inches); red (2.5YR 4/6), dark red (2.5YR 3/6), moist; fine sandy loam; 29 percent clay; strong coarse prismatic parts to moderate medium subangular blocky structure; hard, firm; common (2.0) very fine roots throughout and common (1.0) fine roots throughout; 90 percent distinct clay films on all faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03330; moist when described; observed in pit, small

Bt2—68 to 155 centimeters (26.8 to 61.0 inches); red (2.5YR 5/8), red (2.5YR 4/8), moist; fine sandy loam; 26 percent clay; moderate medium prismatic parts to moderate medium subangular blocky structure; hard, firm; common (1.0) very fine roots throughout and common (1.0) fine roots throughout; 70 percent distinct clay films on all faces of peds; fragments; noneffervescent, by hcl, 1n; clear smooth boundary. Lab sample # 17N03331; moist when described; observed in pit, small

BCt—155 to 212 centimeters (61.0 to 83.5 inches); reddish yellow (5YR 6/8), yellowish red (5YR 5/8), moist; fine sandy loam; 15 percent clay; weak medium subangular blocky parts to weak fine subangular blocky structure; slightly hard, friable; very few (0.2) very fine roots throughout; 10 percent distinct clay films on vertical faces of peds; 15 percent fine distinct irregular noncoherent cemented reddish yellow (7.5YR 6/6), moist, and reddish yellow (7.5YR 7/6), dry, masses of oxidized iron with sharp boundaries throughout; fragments; noneffervescent, by hcl, 1n. Lab sample # 17N03332; dry when described; observed in auger, bucket