IDENTIFIERS

Current Taxon Name (Soil Name): Cornwall

OSD

Series Extent

User Site ID: 1999MO203023M

User Pedon ID: 1999MO203023M

User Site Association ID: 8560

Transect:

Transect Stop Number - 10

Transect Interval - 200.0

Lab Information:

Certified Lab Pedon Description - yes

Lab Source ID - MCL

Lab Pedon # - M9961323

NCSS Pedon Lab Data NASIS Record ID - 31540

User Project ID: 2021-25NCSPR013

Project Name: MLRA 116A - Mark Twain National Forest Update

Print Date: 2/17/2025

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: 36.9238639

Std. Longitude: -91.5014667

Datum: WGS84

Map Unit: 73311—Scholten-Bendavis-Poynor complex, 8 to 15 percent slopes

State: Missouri

County: MO203—Shannon

MLRA: 116A—Ozark Highland

MLRA Soil Survey Area: NC-SPM—Springfield, Missouri

Non-MLRA Soil Survey Area: MO203—Shannon County, Missouri

7.5 Minute USGS Quad: 36091-H5—Montier, Missouri

PEDON

Describers Name: SE, DC,LT and BM

Current Taxonomic Class: Fine-silty, mixed, active, mesic Fragiaquic Hapludults

Current Taxon Kind: taxadjunct

Pedon Type: taxadjunct to the series

Pedon Purpose: laboratory sampling site

Pedon Record Orgin: Converted from PDP 3.x

Correlated Information:

Soil Name - Cornwall

PSC - 36 to 84 cm.

Classificaton Date - 9/25/2018

Classifier - J.R. Perkins

Soil Taxonomic Edition - twelfth edition

Sampled As Information:

Soil Name - Captina

Taxonomic Class - Fine-silty, siliceous, active, mesic Typic Fragiudults

Taxon Kind - series

PSC - 36 to 84 cm.

Classificaton Date - 2/18/1999

Soil Taxonomic Edition - twelfth edition

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

Certification Status: certified

QC Status: level 1

Field Measured Properties: 27.5 percent of pscs clay and 9.7 percent of pscs sand and 5.2 percent of pscs gravel and 0.45 ratio of cec to clay ratio

SITE

Parent Material: slope alluvium over pedisediment over slope alluvium

Landscape: karstland

Landform: sinkhole

Hill Slope Profile: toeslope

Slope Shape Across: linear

Slope Shape Down: linear

Drainage Class: somewhat poorly

Flooding: none flooding

Ponding: none ponding

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 2/18/1999 (actual site observation date)

Surface Cover Properties:

Site Obs. Cover Kind 1 - tree cover

Site Obs. Cover Kind 2 - hardwoods

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon argillic horizon redox depletions with chroma 2 or less fragic soil properties lithologic discontinuity lithologic discontinuity	0—36 36—229 71—229 84—132 84—132 132—229	—36— —193— —158— —48— —48— —97—

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
4	—	—	299	—	234	—	—	—	—	—	—	—	—	—	—	—	—	—	—

A1—0 to 10 centimeters (0.0 to 3.9 inches); 70 percent brown (10YR 5/3) and 30 percent pale brown (10YR 6/3) silt loam; weak fine granular structure; friable; 11.0 fine and medium roots; 7.0 very fine and fine interstitial and tubular pores; 2 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU063800

A2—10 to 20 centimeters (3.9 to 7.9 inches); 60 percent brown (10YR 4/3) and 40 percent brown (10YR 5/3) silt loam; moderate very fine subangular blocky structure; friable; 11.0 fine to coarse roots; 7.0 very fine and fine tubular pores; 2 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU063801

Bt1—20 to 36 centimeters (7.9 to 14.2 inches); 50 percent brown (10YR 4/3) and 50 percent dark yellowish brown (10YR 4/4) silt loam; moderate very fine subangular blocky structure; friable; 7.0 fine to coarse roots; 3.0 very fine and fine tubular pores; 15 percent distinct brown (10YR 4/3) clay films on faces of peds; 1 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; abrupt wavy boundary. Lab sample # MU063802

Bt2—36 to 53 centimeters (14.2 to 20.9 inches); dark yellowish brown (10YR 4/4) silty clay loam; moderate very fine subangular blocky structure; friable; 5.0 fine and medium roots; 3.0 very fine and fine tubular pores; 15 percent distinct brown (10YR 4/3) clay films on faces of peds and 15 percent distinct yellowish brown (10YR 5/4) silt coats on faces of peds; 1 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU063803

Bt3—53 to 71 centimeters (20.9 to 28.0 inches); yellowish brown (10YR 5/4) silty clay loam; moderate fine subangular blocky structure; friable; 5.0 fine and medium roots; 3.0 very fine and fine tubular pores; 15 percent faint dark yellowish brown (10YR 4/4) clay films on faces of peds and 35 percent distinct pale brown (10YR 6/3) silt coats on faces of peds; 2 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU063804

Bt4—71 to 84 centimeters (28.0 to 33.1 inches); strong brown (7.5YR 5/6) gravelly silty clay loam; moderate fine subangular blocky structure; friable; 7.0 fine to coarse roots; 3.0 very fine and fine tubular pores; 15 percent faint brown (10YR 5/3) clay films on faces of peds and 60 percent distinct light brownish gray (10YR 6/2) silt coats on faces of peds; 15 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; abrupt wavy boundary. Lab sample # MU063805

2Btx—84 to 132 centimeters (33.1 to 52.0 inches); pale brown (10YR 6/3) extremely gravelly silt loam; massive; very firm; brittle; 0.1 fine interstitial and tubular pores; 5 percent distinct grayish brown (10YR 5/2) clay films on rock fragments and 15 percent faint brown (10YR 5/3) clay films on faces of peds and 35 percent distinct light brownish gray (10YR 6/2) silt coats on faces of peds; 70 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; abrupt wavy boundary. Lab sample # MU063806

3Bt1—132 to 152 centimeters (52.0 to 59.8 inches); pale brown (10YR 6/3) silt loam; weak thin platy parts to moderate very fine subangular blocky structure; friable; 0.9 fine interstitial and tubular pores; 35 percent distinct light gray (10YR 7/2) silt coats on faces of peds and 35 percent distinct brown (10YR 5/3) clay films on faces of peds and 35 percent distinct light brownish gray (10YR 6/2) silt coats on faces of peds; 1 percent spherical black (N 2/0) iron-manganese masses and 20 percent brownish yellow (10YR 6/6) masses of oxidized iron; 5 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; gradual smooth boundary. Lab sample # MU063807

3Bt2—152 to 203 centimeters (59.8 to 79.9 inches); yellowish brown (10YR 5/6) silt loam; moderate fine subangular blocky structure; friable; 0.9 fine interstitial and tubular pores; 5 percent distinct brown (7.5YR 5/2) clay films on faces of peds and 15 percent distinct light yellowish brown (2.5Y 6/4) silt coats on faces of peds and 40 percent distinct yellowish brown (10YR 5/6) clay films on faces of peds; 5 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; clear smooth boundary. Lab sample # MU063808

3Bt3—203 to 229 centimeters (79.9 to 90.2 inches); light yellowish brown (2.5Y 6/4) silt loam; weak coarse platy parts to moderate fine subangular blocky structure; friable; 0.9 fine interstitial and tubular pores; 10 percent distinct light brownish gray (2.5Y 6/2) silt coats on faces of peds and 25 percent distinct dark yellowish brown (10YR 4/6) clay films on faces of peds; 2 percent fine irregular brownish yellow (10YR 6/8) masses of oxidized iron; 5 percent by volume nonflat indurated 2-40-75 millimeter chert fragments; very strongly acid, pH 4.7, hellige-truog. Lab sample # MU063809