IDENTIFIERS

Current Taxon Name (Soil Name): Knobtop

OSD

Series Extent

User Site ID: 1995MO203012M

User Pedon ID: 1995MO203012M

User Site Association ID: 8656

Transect:

Transect Stop Number - 2

Transect Interval - 300.0

Lab Information:

Certified Lab Pedon Description - yes

Lab Source ID - MCL

Lab Pedon # - M9561312

NCSS Pedon Lab Data NASIS Record ID - 31893

Print Date: 11/21/2024

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: 37.1772639

Std. Longitude: -91.2579806

Datum: WGS84

State: Missouri

County: MO203—Shannon

MLRA: 116A—Ozark Highland

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

7.5 Minute USGS Quad: 37091-B3—Eminence, Missouri

PEDON

Describers Name: RLT, SV

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

Current Taxon Kind: series

Pedon Type: map unit inclusion

Pedon Purpose: laboratory sampling site

Pedon Record Orgin: Converted from PDP 3.x

Correlated Information:

Soil Name - Knobtop

PSC - 20 to 70 cm.

Classificaton Date - 1/31/2012

Soil Taxonomic Edition - eighth edition

Moisture Class - udic

Sampled As Information:

Soil Name - Trackler

Taxonomic Class - Fine-loamy, mixed, active, mesic Aquic Hapludults

Taxon Kind - series

PSC - 10 to 60 cm.

Classificaton Date - 4/24/1995

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

Field Measured Properties: 44 Percent rock fragments in the control section (vol) and 29 percent of Percent clay in the control section and 46 Cation exchange capacity to clay ratio

SITE

Parent Material: loess over residuum

Landscape: hills

Landform: ridge

Hill Slope Profile: summit

Slope Position: upper third

Slope Shape Across: convex

Slope Shape Down: linear

Drainage Class: moderately well

Surface Fragments: 0.09 percent

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 4/24/1995 (actual site observation date)

Air Photo ID: 14

Surface Cover Properties:

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Pedon Restrictions
Kind	Hardness	Restriction Depth L-H	Restriction Thickness L-RV-H
		cm
bedrock, lithic	—	71 -	—

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 lithic contact	0—10 10—71 43— 71—	—- —- —- —-

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
8	—	—	341	—	330	—	—	—	—	—	—	—	—	—	—	—	—	—	—

A—0 to 10 centimeters (0.0 to 3.9 inches); dark brown (10YR 3/3) silt loam; moderate medium granular structure; friable; 3.0 medium roots and 3.0 fine roots and 0.5 coarse roots; 7.0 fine interstitial and tubular pores; 3 percent by volume 2-39-75 millimeter rhyolite fragments; very strongly acid, pH 5.0, hellige-truog; clear smooth boundary. Lab sample # MU054337

Bt1—10 to 20 centimeters (3.9 to 7.9 inches); 55 percent yellowish brown (10YR 5/6) and 45 percent yellowish brown (10YR 5/4) silt loam; weak fine subangular blocky structure; friable; 3.0 medium roots and 0.5 fine roots and 0.5 coarse roots; 0.5 fine interstitial and tubular pores; 15 percent faint brown (10YR 4/3), moist, organic stains on faces of peds and 35 percent faint yellowish brown (10YR 5/6), moist, clay films on faces of peds; 5 percent by volume 2-39-75 millimeter rhyolite fragments; very strongly acid, pH 4.7, hellige-truog; clear smooth boundary. Lab sample # MU054338

2Bt2—20 to 30 centimeters (7.9 to 11.8 inches); strong brown (7.5YR 5/6) gravelly silty clay loam; moderate fine subangular blocky structure; firm; 3.0 medium roots and 0.5 fine roots and 0.5 coarse roots; 3.0 fine tubular pores; 15 percent distinct brown (7.5YR 5/3), moist, silt coats on faces of peds and 35 percent faint strong brown (7.5YR 4/6), moist, clay films on faces of peds; 1 percent fine spherical black (N 2/0) iron-manganese concretions throughout; 1 percent by volume 75-162-250 millimeter rhyolite fragments and 20 percent by volume 2-39-75 millimeter rhyolite fragments; very strongly acid, pH 4.7, hellige-truog; clear smooth boundary. Lab sample # MU054339

2Bt3—30 to 43 centimeters (11.8 to 16.9 inches); strong brown (7.5YR 4/6) very gravelly silty clay loam; moderate fine subangular blocky structure; firm; 0.5 medium roots and 0.5 fine roots and 0.5 coarse roots; 3.0 fine tubular pores; 15 percent distinct yellowish brown (10YR 5/8), moist, silt coats on rock fragments and 15 percent distinct black (N 2/0), moist, iron stains and 35 percent faint yellowish red (5YR 4/6), moist, clay films on faces of peds; 5 percent by volume 75-162-250 millimeter rhyolite fragments and 45 percent by volume 2-39-75 millimeter rhyolite fragments; very strongly acid, pH 4.6, hellige-truog; clear wavy boundary. Lab sample # MU054340

2Bt4—43 to 71 centimeters (16.9 to 28.0 inches); light brownish gray (10YR 6/2) very gravelly silt loam; 10 percent gray (10YR 6/1) fine distinct and 10 percent strong brown (7.5YR 5/8) fine prominent mottles; weak fine subangular blocky structure; firm; 0.5 medium roots and 0.5 fine roots; 0.5 fine tubular pores; 15 percent faint light brownish gray (10YR 6/2), moist, clay films on sand and gravel; 2 percent fine spherical noncoherent cemented yellowish red (5YR 5/6) masses of oxidized iron throughout; 15 percent by volume 2-39-75 millimeter rhyolite fragments and 35 percent by volume 75-162-250 millimeter rhyolite fragments; very strongly acid, pH 4.5, hellige-truog; clear wavy boundary. Lab sample # MU054341

2R—71 centimeters (28.0 inches); bedrock; fragments.