IDENTIFIERS

Current Taxon Name (Soil Name): Twichell

OSD

Series Extent

Local Phase: silty clay loam

User Site ID: S1994TX357002

User Pedon ID: S1994TX357002

Lab Information:

Certified Lab Pedon Description - yes

Lab Source ID - KSSL

Lab Pedon # - 94P0655

NCSS Pedon Lab Data NASIS Record ID - 66828

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: 36.2783333

Std. Longitude: -100.9970833

Datum: WGS84

Country: US—United States

State: Texas

County: TX357—Ochiltree

MLRA: 77A—Southern High Plains, Northern Part

MLRA Soil Survey Area: SC-WOD—Woodward, Oklahoma

Non-MLRA Soil Survey Area: TX357—Ochiltree County, Texas

7.5 Minute USGS Quad: 36100-D7—Perryton, Texas

PEDON

Describers Name: Carolyn Olsen, et. al.

Current Taxonomic Class: Fine, mixed, superactive, mesic Aridic Haplusterts

Current Taxon Kind: series

Pedon Type: classifies to current taxon name, full description

Pedon Purpose: research site

Pedon Record Orgin: Converted from PDP 3.x

Pedon #: 2

Correlated Information:

Soil Name - Twichell

PSC - 25 to 100 cm.

Classificaton Date - 1/31/2022

Classifier - Steven McGowen

Soil Taxonomic Edition - twelfth edition

Moisture Class - ustic

Moisture Subclass - aridic (torric)

Sampled As Information:

Soil Name - Pullman

Classificaton Date - 7/16/1994

Classifier - Carolyn Olsen, et. al.

Dynamic Soil Properties:

Erosion Class - 1

Pedoderm Loose Cover Indicator - no

Pedon Vegetation and Crop Cover Information:

Current Crop - wheat, winter

Residue Description - wheat stubble

Hydric: no

Certification Status: certified

QC Status: level 1

QA Status: not reviewed

SITE

Parent Material: silty and clayey calcareous loess

Landscape: High plains

Landform: loess plain

Geomorphic Component Flats: talf

Slope Complexity: simple

Slope Shape Across: linear

Slope Shape Down: linear

Drainage Class: well

Flooding: none flooding

Ponding: none ponding

Surface Fragments:

Benchmark Soil?: no

VEGETATION

Ecological Sites. (Click Ecological Site ID For Link to EDIT.)
Ecological Site ID	Ecological Site Name	Correlation Data	Classifier
R077AY001TX	Deep Hardland 16-22" PZ	Jan 31 2022	Steven McGowen

SITE OBSERVATION

Observation Date: 7/16/1994 (actual site observation date)

Data Collector: Carolyn Olsen, et. al.

Air Photo ID: Sheet #17

Surface Cover Properties:

Site Obs. Cover Kind 1 - crop cover

Site Obs. Cover Kind 2 - close-grown crop

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Site Erosion Accelerated: water erosion

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
mollic epipedon slickensides secondary carbonates lithologic discontinuity calcic horizon lithologic discontinuity redox concentrations lithologic discontinuity calcic horizon	0—20 20—160 51—843 180—325 290—526 325—660 526—577 660—843 660—749	—20— —140— —792— —145— —236— —335— —51— —183— —89—

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
0.2	—	—	888	—	135	—	—	—	—	—	—	—	—	—	—	—	—	—	—

Ap1—0 to 10 centimeters (0.0 to 3.9 inches); gray (10YR 5/1), very dark grayish brown (10YR 3/2), moist; silty clay loam; weak medium subangular blocky structure; very hard, noncoherent, slightly sticky, moderately plastic; brittle; low penetration resistance; moderately slow permeability; 21.0 very fine and fine roots throughout; 0.5 very fine and fine moderate-continuity tubular pores; fragments; noneffervescent, by hcl, 1n; abrupt smooth boundary. Lab sample # 94P04828; dry when described; observed in auger, screw

Ap2—10 to 20 centimeters (3.9 to 7.9 inches); gray (10YR 5/1), very dark grayish brown (10YR 3/2), moist; silty clay loam; weak medium subangular blocky structure; very hard, noncoherent, slightly sticky, moderately plastic; brittle; high penetration resistance; slow permeability; 21.0 very fine and fine roots throughout; 0.5 very fine and fine low-continuity tubular pores; fragments; noneffervescent, by hcl, 1n; abrupt smooth boundary. Lab sample # 94P04829; dry when described; observed in auger, screw

Btss1—20 to 64 centimeters (7.9 to 25.2 inches); light brownish gray (10YR 6/2), dark grayish brown (10YR 4/2), moist; silty clay; moderate fine and medium angular blocky structure; firm, noncoherent; semideformable; low penetration resistance; moderately slow permeability; 21.0 very fine and fine roots throughout; 3.0 very fine and fine low-continuity tubular pores; faint clay bridges on faces of peds and faint pressure faces on faces of peds; fragments; slight effervescence, by hcl, 1n; clear smooth boundary. Lab sample # 94P04830; moist when described; observed in auger, screw. Could not decide if clay bridging was strong enough to be argillic - my opinion - No! Two CaCO3 concretions at approximately 20 inches. One 1/4"""" diameter round, one 1/4 x 1/2 cylindrical. Both degrading.; discontinuous - phpvsfiid 390007; discontinuous - phpvsfiid 390008; discontinuous - phpvsfiid 390007; discontinuous - phpvsfiid 390008

Btss2—64 to 97 centimeters (25.2 to 38.2 inches); light brownish gray (10YR 6/2), dark grayish brown (10YR 4/2), moist; silty clay; moderate fine and medium angular blocky structure; firm, noncoherent, moderately sticky, moderately plastic; semideformable; low penetration resistance; moderately slow permeability; 3.0 very fine and fine roots between peds; 3.0 very fine and fine low-continuity tubular pores; faint pressure faces and faint clay bridges; fragments; slight effervescence, by hcl, 1n; clear smooth boundary. Lab sample # 94P04831; moist when described; observed in auger, screw. Same as horizon above.; patchy - phpvsfiid 390009; patchy - phpvsfiid 390010; patchy - phpvsfiid 390009; patchy - phpvsfiid 390010

Btkss1—97 to 160 centimeters (38.2 to 63.0 inches); light brownish gray (10YR 6/2), dark grayish brown (10YR 4/2), moist; silty clay; moderate fine and medium subangular blocky structure; friable, noncoherent, moderately sticky, moderately plastic; semideformable; moderate penetration resistance; 0.5 very fine and fine roots between peds; 0.5 very fine and fine low-continuity tubular pores; faint pressure faces; fine threadlike extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate nodules throughout; fragments; violent effervescence, by hcl, 1n; clear smooth boundary. Lab sample # 94P04832; moist when described; observed in auger, screw. patchy - phpvsfiid 390011; patchy - phpvsfiid 390011

Btk—160 to 180 centimeters (63.0 to 70.9 inches); light brownish gray (10YR 6/2), dark grayish brown (10YR 4/2), moist; silty clay loam; moderate fine and medium subangular blocky structure; friable, noncoherent, moderately sticky, moderately plastic; semideformable; 0.5 very fine and fine low-continuity tubular pores; 35 percent distinct very pale brown (10YR 8/2) carbonate coats throughout; 15 percent fine threadlike extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate threads throughout and 1 percent fine spherical carbonate concretions throughout; fragments; violent effervescence, by hcl, 1n; clear smooth boundary. Lab sample # 94P04833; observed in auger, screw. discontinuous - phpvsfiid 390012; discontinuous - phpvsfiid 390012

2Btkb—180 to 290 centimeters (70.9 to 114.2 inches); light brown (7.5YR 6/4), brown (7.5YR 4/4), moist; silty clay loam; moderate fine and medium angular blocky parts to moderate medium prismatic structure; friable, noncoherent, moderately sticky, moderately plastic; semideformable; 0.5 very fine and fine moderate-continuity tubular pores; 2 percent faint carbonate coats on faces of peds and in pores and 15 percent black (10YR 2/1) black stains on faces of peds and 40 percent faint clay films on faces of peds; 1 percent threadlike extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate threads throughout; fragments; gradual smooth boundary. Lab sample # 94P04834; observed in auger, screw. patchy - phpvsfiid 390013; patchy - phpvsfiid 390014; patchy - phpvsfiid 390015; patchy - phpvsfiid 390013; patchy - phpvsfiid 390014; patchy - phpvsfiid 390015

2Bk—290 to 325 centimeters (114.2 to 128.0 inches); light gray (10YR 7/2), light brownish gray (10YR 6/2), moist; silty clay; moderate fine and medium subangular blocky parts to moderate medium prismatic structure; friable, noncoherent, moderately sticky, moderately plastic; semideformable; 0.5 very fine and fine low-continuity tubular pores; 40 percent prominent very pale brown (10YR 8/2) carbonate coats throughout; 15 percent fine threadlike noncoherent cemented very pale brown (10YR 8/2) carbonate threads throughout and 15 percent fine and medium irregular weakly coherent cemented very pale brown (10YR 8/2) carbonate nodules throughout and 15 percent fine and medium spherical extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate concretions throughout; fragments; noneffervescent, by hcl, 1n; gradual smooth boundary. Lab sample # 94P04835; observed in auger, screw. discontinuous - phpvsfiid 390016; discontinuous - phpvsfiid 390016

3Btkb1—325 to 376 centimeters (128.0 to 148.0 inches); pink (7.5YR 7/4), brown (7.5YR 5/4), moist; clay loam; moderate fine and medium angular blocky parts to moderate medium prismatic structure; friable, noncoherent; 0.5 very fine and fine low-continuity tubular pores; 75 percent distinct clay films on faces of peds; 10 percent fine threadlike noncoherent cemented very pale brown (10YR 8/2) carbonate threads throughout; fragments; strong effervescence, by hcl, 1n; gradual smooth boundary. Lab sample # 94P04836; observed in auger, screw. discontinuous - phpvsfiid 390017; discontinuous - phpvsfiid 390017

3Btkb2—376 to 526 centimeters (148.0 to 207.1 inches); pink (7.5YR 7/3), brown (7.5YR 5/4), moist; clay; moderate medium prismatic parts to moderate fine and medium subangular blocky structure; friable, noncoherent; 0.5 very fine and fine low-continuity tubular pores; 30 percent distinct clay films on faces of peds; 20 percent fine threadlike extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate threads throughout and 15 percent medium irregular extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate nodules throughout; fragments; strong effervescence, by hcl, 1n; gradual smooth boundary. Lab sample # 94P04837; observed in auger, screw. discontinuous - phpvsfiid 390018; discontinuous - phpvsfiid 390018

3Btkb3—526 to 577 centimeters (207.1 to 227.2 inches); light brown (7.5YR 6/4), strong brown (7.5YR 4/6), moist; clay loam; weak medium subangular blocky structure; friable, noncoherent; 0.5 very fine and fine low-continuity tubular pores; 15 percent distinct clay films on faces of peds; 1 percent fine spherical black (10YR 2/1) iron-manganese concretions between peds; 10 percent fine threadlike extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate threads throughout and 10 percent medium irregular extremely weakly coherent cemented very pale brown (10YR 8/2) carbonate nodules throughout; fragments; strong effervescence, by hcl, 1n; gradual smooth boundary. Lab sample # 94P04838; observed in auger, screw. discontinuous - phpvsfiid 390019; discontinuous - phpvsfiid 390019

3Btkb4—577 to 660 centimeters (227.2 to 259.8 inches); clay loam; friable, noncoherent; fragments. Lab sample # 94P04839; observed in auger, screw

4Btkb1—660 to 749 centimeters (259.8 to 294.9 inches); pale brown (10YR 6/3), brown (10YR 4/3), moist; clay loam; moderate medium prismatic parts to moderate fine and medium angular blocky structure; friable, noncoherent; 0.5 very fine and fine low-continuity tubular pores; 25 percent distinct clay films on faces of peds; fragments; strong effervescence, by hcl, 1n. Lab sample # 94P04840; observed in auger, screw. discontinuous - phpvsfiid 390020; discontinuous - phpvsfiid 390020

4Btkb2—749 to 843 centimeters (294.9 to 331.9 inches); silty clay loam; noncoherent; fragments. Lab sample # 94P04841; observed in auger, screw