IDENTIFIERS

Current Taxon Name (Soil Name): Houston Black

OSD

Series Extent

User Site ID: S09TX3090010

User Pedon ID: S09TX309010

Vegetation Plot ID: S09TX3090010

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - TAMU

Lab Pedon # - S09TX309010

NCSS Pedon Lab Data NASIS Record ID - 45607

Print Date: 1/30/2025

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: 31.6151218

Std. Longitude: -96.8676529

Datum: WGS84

State: Texas

County: TX309—McLennan

MLRA: 86A—Texas Blackland Prairie, Northern Part

7.5 Minute USGS Quad: 31096-E7—Mart, Texas

PEDON

Describers Name: RMR, THW, PDH

Current Taxonomic Class: Fine, smectitic, thermic Udic Haplusterts

Pedon Type: TUD pedon

Pedon Purpose: research site

Pedon Record Orgin: PedonPC

Correlated Information:

Soil Name - Houston Black

PSC - 25 to 100 cm.

Classificaton Date - 5/21/2012

Soil Taxonomic Edition - eleventh edition

Moisture Class - ustic

Moisture Subclass - udic

Sampled As Information:

Soil Name - Houston Black

Classificaton Date - 3/3/2009

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

Certification Status: certified

QC Status: level 1

QA Status: level 1

SITE

Parent Material: clayey residuum weathered from mudstone

Landscape: —Error in Exists On—

Landform: plain

Geomorphic Component Hills: crest

Hill Slope Profile: summit

Slope Shape Across: convex

Slope Shape Down: convex

Runoff: high

Drainage Class: moderately well

Bedrock: noncoherent strong weathered mudstone at 181cm with <10

Geology: Kwc formation.

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 3/3/2009 (actual site observation date)

Air Photo ID:

Surface Cover Properties:

Site Obs. Cover Kind 1 - grass/herbaceous cover

Site Obs. Cover Kind 2 - other grass/herbaceous cover

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

Yield Study ID -

Pedon Horizon Lab Results - 1
Horizon	Top Depth	Bottom Depth	Sample ID	Data Collector	Total Clay	CaCO3 Clay	Total Silt	Fine Silt	Co. Silt	Total Sand	Total Sand Method	VC Sand	Co. Sand	Med. Sand	Fine Sand	VF Sand	VF Sand Method	Texture Class - Field Lab	Rubbed Fiber	Unrubbed Fiber	pH H2O
	cm	cm			%	%	%	%	%	%		%	%	%	%	%			%	%
Ap Ap Ap Bss1 Bss1 Bss1 Bss2 Bss2 Bss2 Bkss Bkss Bkss BCkss BCkss BCkss Cdk Cdk Cdk	0 0 0 22 22 22 56 56 56 99 99 99 151 151 151 181 181 181	— 22 22 — 56 56 — 99 99 — 151 151 — 181 181 — 215 215	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	0.1 — — 0.1 — — 0.1 — — 0.4 — — 0.2 — — 1.1 — —	0.1 — — 0.1 — — 0.2 — — 0.4 — — 0.3 — — 0.9 — —	0.4 — — 0.5 — — 0.4 — — 0.4 — — 0.2 — — 0.5 — —	7.3 — — 6.8 — — 6.3 — — 5.4 — — 4.2 — — 3.8 — —	19 — — 16.4 — — 15.6 — — 12.9 — — 10.2 — — 11 — —	300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — — 300 mesh sieve — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —

Pedon Horizon Lab Results - 2
Horizon	Top Depth	Bottom Depth	Sample ID	pH CaCl2	pH NaF	pH Ox	Delta pH	LL	PL	PI	Atter. Samp. Cond.	COLE	Pot. Acidity	Ca + Mg - Meh 2	K	Ca + Mg - Sat. Paste	KCl Extract. Acidity	Base Sat. - Meh 2	CEC-7	CEC-8.2
	cm	cm						%	%	%		cm/cm	meq/100g	cmol(+)/kg	cmol(+)/kg	mmol(+)/l	cmol(+)/kg	%	cmol(+)/kg	cmol(+)/kg
Ap Ap Ap Bss1 Bss1 Bss1 Bss2 Bss2 Bss2 Bkss Bkss Bkss BCkss BCkss BCkss Cdk Cdk Cdk	0 0 0 22 22 22 56 56 56 99 99 99 151 151 151 181 181 181	— 22 22 — 56 56 — 99 99 — 151 151 — 181 181 — 215 215	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —		— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	34.2 — — 34.1 — — 35.4 — — 54.5 — — 54.2 — — 52.6 — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —

Pedon Horizon Lab Results - 3
Horizon	Top Depth	Bottom Depth	Sample ID	ECEC	Phosphate P	NO3-N	EC	EC Method	EC 1:5 by volume	CaCO3 Equiv.	Equiv. Gypsum	Na	SAR	Gypsum Req.	Humic Color	Fulvic Color	Humic + Fulvic Color	Al	PI	Pyro. Hue	PyrO. Value	Pyro. Chroma
	cm	cm		cmol(+)/kg	mg/kg	mg/kg	dS/m		dS/m	%	%	mmol(+)/l	%	L-pcu/g	L-pcu/g	L-pcu/g	%
Ap Ap Ap Bss1 Bss1 Bss1 Bss2 Bss2 Bss2 Bkss Bkss Bkss BCkss BCkss BCkss Cdk Cdk Cdk	0 0 0 22 22 22 56 56 56 99 99 99 151 151 151 181 181 181	— 22 22 — 56 56 — 99 99 — 151 151 — 181 181 — 215 215	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste ec meter, saturated paste	— — — — — — — — — — — — — — — — — —	— — 1 — — 1 — 1 — — — 2 — — 7 — — 12	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— 1 — — 2 — — — 5 — 9 — — 10 — — 10 —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —	— — — — — — — — — — — — — — — — — —

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
LOLIU XANTH2	Lolium Xanthium	ryegrass cocklebur	— —	— —	— —

Pedon Restrictions
Kind	Hardness	Restriction Depth L-H	Restriction Thickness L-RV-H
		cm
densic material	noncoherent	181 - 215	—

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
mollic epipedon slickensides secondary carbonates densic materials	0—56 22—181 99—215 181—215	—- —- —- —-

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	—	—	176	—		—	—	—	—	—	—	—	—	—	—	—	—	—	—

Ap—0 to 22 centimeters (0.0 to 8.7 inches); dark gray (10YR 4/1), very dark gray (10YR 3/1), moist; clay loam; 27 percent sand; 33 percent silt; 40 percent clay; moderate medium subangular blocky structure; hard, firm, very sticky, very plastic; 5.0 very fine roots throughout and 2.0 fine roots throughout; 1.0 very fine pores; fragments; 0.3 cmol/kg of Sodium; 38.7 cmol/kg of CEC; 90 percent of Base Saturation; noneffervescent, by hcl, 1n; neutral, pH 7.0, pH meter; clear smooth boundary. Lab sample # TAMU7545; dry when described; observed in trench

Bss1—22 to 56 centimeters (8.7 to 22.0 inches);, very dark gray (10YR 3/1), moist; clay; 24 percent sand; 33 percent silt; 43 percent clay; moderate medium angular blocky structure; friable, very sticky, very plastic; 4.0 very fine roots throughout and 1.0 fine roots throughout; 0.5 very fine pores; 10 percent distinct slickensides (pedogenic); 1 percent by volume nonflat rounded quartzite fragments; 0.7 cmol/kg of Sodium; 40.2 cmol/kg of CEC; 88 percent of Base Saturation; noneffervescent, by hcl, 1n; slightly alkaline, pH 7.5, pH meter; gradual wavy boundary. Lab sample # TAMU7546; moist when described; observed in trench

Bss2—56 to 99 centimeters (22.0 to 39.0 inches);, 15 percent dark gray (10YR 4/1) and very dark gray (10YR 3/1), moist; clay; 23 percent sand; 33 percent silt; 44 percent clay; moderate medium angular blocky structure; firm, very sticky, very plastic; 3.0 very fine roots throughout and 1.0 fine roots throughout; 0.5 very fine irregular pores; 30 percent prominent slickensides (pedogenic); 1 percent by volume nonflat rounded quartzite fragments; 2.2 cmol/kg of Sodium; 41.3 cmol/kg of CEC; 92 percent of Base Saturation; noneffervescent, by hcl, 1n; moderately alkaline, pH 8.0, pH meter; clear wavy boundary. Lab sample # TAMU7547; moist when described; observed in trench

Bkss—99 to 151 centimeters (39.0 to 59.4 inches);, 15 percent very dark gray (10YR 3/1) and 5 percent olive brown (2.5Y 4/3) and very dark grayish brown (10YR 3/2), moist; clay; 20 percent sand; 33 percent silt; 48 percent clay; moderate medium subangular blocky parts to weak medium angular blocky structure; firm, very sticky, very plastic; 2.0 very fine roots throughout; 1.0 very fine pores; 20 percent prominent slickensides (pedogenic); 1 percent fine carbonate concretions throughout and 2 percent medium carbonate concretions throughout; fragments; 4.5 cmol/kg of Sodium; 41.2 cmol/kg of CEC; 100 percent of Base Saturation; very slight effervescence, by hcl, 1n; moderately alkaline, pH 8.0, pH meter; gradual wavy boundary. Lab sample # TAMU7548; moist when described; observed in trench

BCkss—151 to 181 centimeters (59.4 to 71.3 inches);, 20 percent yellowish brown (10YR 5/8) and 10 percent dark gray (10YR 4/1) and olive brown (2.5Y 4/3), moist; clay; 15 percent sand; 35 percent silt; 50 percent clay; weak medium subangular blocky structure; firm, very sticky, very plastic; 0.2 very fine roots throughout; 2.0 very fine high-continuity pores; 10 percent distinct slickensides (pedogenic); 1 percent medium faint carbonate masses throughout; fragments; 4.8 cmol/kg of Sodium; 36.6 cmol/kg of CEC; 100 percent of Base Saturation; slight effervescence, by hcl, 1n; moderately alkaline, pH 8.0, pH meter; clear smooth boundary. Lab sample # TAMU7549; moist when described; observed in trench

Cdk—181 to 215 centimeters (71.3 to 84.6 inches);, 15 percent yellowish brown (10YR 5/8) and 10 percent gray (2.5Y 6/1) and light olive brown (2.5Y 5/3), moist; clay; 17 percent sand; 35 percent silt; 48 percent clay; structureless massive; firm, very sticky, very plastic; 2 percent coarse prominent platy carbonate masses around rock fragments; fragments; 4.4 cmol/kg of Sodium; 30.6 cmol/kg of CEC; 100 percent of Base Saturation; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.1, pH meter. Lab sample # TAMU7550; moist when described; observed in trench