IDENTIFIERS

Current Taxon Name (Soil Name): Melado

OSD

Series Extent

User Site ID: S2004-TX377-002-copy

User Pedon ID: S2004-TX377-002-copy

Vegetation Plot ID: S2004-TX377-002-copy

Lab Information:

Certified Lab Pedon Description - no

Lab Source ID - TAMU

Lab Pedon # - S04TX377002

Print Date: 11/14/2024

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: 29.6719971

Std. Longitude: -104.4803543

Datum: WGS84

Location Description: Presidio County, Texas; from the intersection of US Highway 67 and FM 170 north of Presidio, 9.6 miles northwest on FM 170 to ranch road, 1.3 miles northeast on ranch road, then 600 feet north in rangeland.

Map Unit: MPB—Melado-Pantera complex, 1 to 5 percent slopes

Country: US—United States

State: Texas

County: TX377—Presidio

MLRA: 42—Southern Desertic Basins, Plains, and Mountains

MLRA Soil Survey Area: SW-MAF—Marfa, Texas

Non-MLRA Soil Survey Area: TX377—Presidio County, Texas

7.5 Minute USGS Quad: 29104-F4—Arroyo Melado, Texas

PEDON

Describers Name: Lynn Loomis, Tom Hallmark, Jim Clausen, and Derek Milner

Current Taxonomic Class: Fine, smectitic, hyperthermic Typic Haplosalids

Current Taxon Kind: series

Pedon Type: OSD pedon

Pedon Purpose: full pedon description

Pedon Record Orgin: NASIS

Correlated Information:

Soil Name - Melado

PSC - 25 to 100 cm.

Classificaton Date - 6/20/2017

Classifier - Lynn Loomis and David Jalali

Soil Taxonomic Edition - twelfth edition

Moisture Class - aridic (torric)

Moisture Subclass - typic

Sampled As Information:

Soil Name - Melado-OSD

Classificaton Date - 1/5/2004

Dynamic Soil Properties:

Pedoderm Loose Cover Indicator - no

Hydric: no

Certification Status: certified

QC Status: level 1

SITE

Parent Material: alluvium derived from mixed

Landscape: semi-bolson

Landform: alluvial flat

Slope Shape Across: linear

Slope Shape Down: linear

Surface Fragments:

Benchmark Soil?: no

VEGETATION

SITE OBSERVATION

Observation Date: 1/5/2004 (actual site observation date)

Surface Cover Properties:

Site Obs. Cover Kind 1 - barren land

Site Obs. Cover Kind 2 - other barren

Pedoderm Loose Cover Indicator - no

Drained? - no

Bedded Soil? - no

Forest Plantation? - no

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			%	%	%	%	%	%		%	%	%	%	%			%	%
A Bw Bz1 Bz2 Bz3 BCz Cyz Cyz	0 9 25 56 89 112 155 155	9 25 56 89 112 155 220 220	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —

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
A Bw Bz1 Bz2 Bz3 BCz Cyz Cyz	0 9 25 56 89 112 155 155	9 25 56 89 112 155 220 220	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —		— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —

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	%
A Bw Bz1 Bz2 Bz3 BCz Cyz Cyz	0 9 25 56 89 112 155 155	9 25 56 89 112 155 220 220	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	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	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	90 52 37 36 37 40 57 47	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —	— — — — — — — —

Vegetation Plot Plants
Plant Symbol	Scientific Name	National Vernacular Name	Plant Type Group	Canopy Cover %	Vegetation Stata Level
ATAC ATOB	Atriplex acanthocarpa Atriplex obovata	tubercled saltbush mound saltbush	— —	— —	— —

Pedon Diagnostic Features
Feature Kind	Feature Depth L-H	Feature Thickness L-RV-H
	cm
ochric epipedon salic horizon cambic horizon	0—9 0—25 25—155	—- —- —-

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
1	—	—	817.7	—	204	265	914	262	21.5	30.3	12.1	—	—	—	—	—	TX7262	Presidio	PRISM

A—0 to 9 centimeters (0.0 to 3.5 inches); yellowish brown (10YR 5/4), brown (10YR 5/3), moist; clay; 16 percent sand; 39 percent silt; 45 percent clay; weak medium platy, and weak medium subangular blocky structure; slightly hard, friable, very sticky, very plastic; high excavation difficulty; fragments; 41 percent of Field estimated clay content; 10 percent of Field estimated sand content; 49 percent of Field estimated silt content; sic of Field estimated texture class; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.2, pH meter; gradual smooth boundary. Lab sample # TAMU6846; dry when described; observed in trench

Bw—9 to 25 centimeters (3.5 to 9.8 inches); brown (10YR 5/3), brown (10YR 4/3), moist; clay; 15 percent sand; 38 percent silt; 47 percent clay; weak coarse prismatic parts to weak medium subangular blocky parts to weak fine subangular blocky, and weak medium platy structure; moderately hard, firm, very sticky, very plastic; high excavation difficulty; fragments; 41 percent of Field estimated clay content; 10 percent of Field estimated sand content; 49 percent of Field estimated silt content; sic of Field estimated texture class; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.0, pH meter; gradual smooth boundary. Lab sample # TAMU6847; dry when described; observed in trench

Bz1—25 to 56 centimeters (9.8 to 22.0 inches); brown (10YR 5/3), brown (10YR 4/3), moist; clay; 17 percent sand; 36 percent silt; 47 percent clay; weak coarse prismatic parts to weak coarse subangular blocky parts to weak fine subangular blocky structure; moderately hard, firm, very sticky, very plastic; high excavation difficulty; 5 percent fine threadlike noncoherent cemented white (10YR 8/1), dry, salt masses throughout; fragments; 41 percent of Field estimated clay content; 10 percent of Field estimated sand content; 49 percent of Field estimated silt content; strong effervescence, by hcl, 1n; moderately alkaline, pH 7.9, pH meter; gradual smooth boundary. Lab sample # TAMU6848; dry when described; observed in trench

Bz2—56 to 89 centimeters (22.0 to 35.0 inches); brown (10YR 5/3), brown (10YR 4/3), moist; clay; 12 percent sand; 38 percent silt; 50 percent clay; weak coarse prismatic parts to weak coarse subangular blocky parts to weak medium subangular blocky structure; moderately hard, firm, very sticky, very plastic; high excavation difficulty; 2 percent fine threadlike noncoherent cemented white (10YR 8/1), dry, salt masses throughout; fragments; 41 percent of Field estimated clay content; 10 percent of Field estimated sand content; 49 percent of Field estimated silt content; sic of Field estimated texture class; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.1, pH meter; gradual smooth boundary. Lab sample # TAMU6849; dry when described; observed in trench

Bz3—89 to 112 centimeters (35.0 to 44.1 inches); brown (10YR 5/3), brown (10YR 4/3), moist; clay loam; 28 percent sand; 33 percent silt; 40 percent clay; weak coarse prismatic parts to weak medium subangular blocky structure; moderately hard, firm, very sticky, very plastic; high excavation difficulty; 3 percent fine threadlike noncoherent cemented white (10YR 8/1), dry, salt crystals throughout; fragments; 41 percent of Field estimated clay content; 10 percent of Field estimated sand content; 49 percent of Field estimated silt content; sic of Field estimated texture class; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.1, pH meter; gradual smooth boundary. Lab sample # TAMU6850; dry when described; observed in trench

BCz—112 to 155 centimeters (44.1 to 61.0 inches); light yellowish brown (10YR 6/4), yellowish brown (10YR 5/4), moist; stratified stratified sandy clay loam; 50 percent sand; 27 percent silt; 28 percent clay; weak medium subangular blocky structure; moderately hard, firm, moderately sticky, moderately plastic; high excavation difficulty; 2 percent fine threadlike noncoherent cemented white (10YR 8/1), dry, salt masses throughout; fragments; 35 percent of Field estimated clay content; 25 percent of Field estimated sand content; 40 percent of Field estimated silt content; sr- cl of Field estimated texture class; strong effervescence, by hcl, 1n; moderately alkaline, pH 8.2, pH meter; clear wavy boundary. Lab sample # TAMU6851; dry when described; observed in trench

Cyz—155 to 220 centimeters (61.0 to 86.6 inches); brown (10YR 5/3), brown (10YR 4/3), moist; stratified stratified clay; 32 percent sand; 28 percent silt; 40 percent clay; moderate medium subangular blocky structure; moderately hard, firm, very sticky, very plastic; high excavation difficulty; 5 percent fine irregular noncoherent cemented white (10YR 8/1), dry, gypsum masses throughout and 1 percent fine irregular noncoherent cemented white (10YR 8/1), dry, gypsum crystals, unspecified; fragments; 41 percent of Field estimated clay content; 40 percent of Field estimated sand content; 19 percent of Field estimated silt content; sr- c of Field estimated texture class; strong effervescence, by hcl, 1n; strongly alkaline, pH 8.5, pH meter. Lab sample # TAMU6852; dry when described; observed in pit, small. Stratified 50%. Multicolored sand and gravels. Thicker in upper part. Gypsum crystals form in between sand and clay layers

Cyz—155 to 220 centimeters (61.0 to 86.6 inches); brown (10YR 5/3), brown (10YR 4/3), moist; stratified stratified very gravelly coarse sandy loam; 79 percent sand; 8 percent silt; 13 percent clay; structureless single grain; loose, loose, nonsticky, nonplastic; high excavation difficulty; 50 percent by volume subrounded 2-?-75 millimeter mixed fragments; 3 percent of Field estimated clay content; 95 percent of Field estimated sand content; 2 percent of Field estimated silt content; sr- grv-cos of Field estimated texture class; strong effervescence, by hcl, 1n; strongly alkaline, pH 8.5, pH meter. Lab sample # TAMU6853; dry when described; observed in pit, small. Stratified 50%. Multicolored sand and gravels. Thicker in upper part. Gypsum crystals form in between sand and clay layers