LOCATION SANLUIS                 TX

Established Series
JKW-SAK-AKS
09/2020

SANLUIS SERIES

The Sanluis series consists of very deep, somewhat excessively drained, rapid saturated hydraulic conductivity (rapidly permeable) soils that formed in eolian beach sands. These nearly level to very gently sloping soils occur on foredunes on barrier islands. Slope ranges from 0 to 3 percent. Mean annual precipitation is about 1245 mm (49 in) and mean annual air temperature is about 21 degrees C (68 70 degrees F).

TAXONOMIC CLASS: Mixed, hyperthermic Typic Udipsamments

TYPICAL PEDON: Sanluis fine sand, on a south facing; elevation is 1.2 m (4ft)(Colors are for moist soil unless otherwise stated.)

A--0 to 22 cm (0 to 9 in); light brownish gray (2.5Y 6/2) fine sand; single grain structure; loose, nonsticky, nonplastic; few very fine and fine roots; many fine interstitial pores; moderately alkaline; gradual smooth boundary. (Thickness is 5 to 48 cm [2 to 19in].)

C1--22 to 70 cm (9 to 28 in); light yellowish brown (2.5Y 6/3) fine sand; single grain structure; loose, nonsticky, nonplastic; few very fine and fine roots; many fine interstitial pores; 1 percent flat angular cohesive 2 to 25-millimeter plastic; moderately alkaline; gradual smooth boundary.

C2--70 to 119 cm (28 to 47 in); light yellowish brown (2.5Y 6/3) fine sand; single grain structure; loose, nonsticky, nonplastic; few very fine and fine roots; many fine interstitial pores; 5 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; 1 percent flat subangular weakly cemented 2 to 5-millimeter shell fragments; slightly alkaline; gradual smooth boundary. Combined thickness is 70 to 160 cm [27 to 63 in].)

C3--119 to 146 cm (47 to 58 in); light olive brown (2.5Y 5/3) fine sand; single grain structure; loose, nonsticky, nonplastic; common fine interstitial pores; 1 percent dark gray (2.5Y 4/1) organic stains between sand grains; 2 percent medium prominent yellowish brown (10YR 5/6) masses of oxidized iron with clear boundaries in matrix; 1 percent flat subangular weakly cemented 2- to 5-millimeter shell fragments; moderately alkaline; gradual smooth boundary.

Cg1--146 to 165 cm (58 to 65 in); 70 percent light brownish gray (2.5Y 6/2) and 25 percent gray (N 6/), fine sand; single grain structure; loose, nonsticky, nonplastic; few fine interstitial pores; 5 percent coarse faint gray (2.5Y 6/1) iron depletions; 1 percent flat subangular weakly cemented 2- to 5-millimeter shell fragments; moderately alkaline; gradual smooth boundary. (Combined thickness is 35 to 112 cm [14 to 44in].)

Cg2--165 to 203 cm (65 to 80 in); dark greenish gray (10Y 4/1) fine sand; single grain structure; loose, nonsticky, nonplastic; few fine interstitial pores; about 3 percent coarse and very coarse sand-size shell fragments; 2 percent flat subangular weakly cemented 5- to 20-millimeter shell fragments and 3 percent flat subangular weakly cemented 2- to 5-millimeter shell fragments; moderately alkaline; about 3 percent coarse and very coarse sand-size shell fragments.

TYPE LOCATION:
Galveston County, TX; from the intersection of 13 Mile Road and FM 3005 (San Luis Pass Rd), about 6.2 miles southwest on FM 3005 to beach access road; 0.1 mile southeast to beach; located about 500 feet northeast on foredune.

USGS topographic quadrangle: Sea Isle, TX
Latitude: 29 degrees, 8 minutes, 43.7 seconds N
Longitude: 95 degrees, 1 minute, 53.2 seconds W
Datum: WGS84

UTM Easting: 302393 m
UTM Northing: 3225810 m
UTM Zone: 15

RANGE IN CHARACTERISTICS:

Soil moisture: A udic soil moisture regime. The soil moisture control section is moist in some or all parts for more than 275 days in normal years. Mean annual soil temperature: 71 to 72 degrees C (21.7 to 22.2 degrees F)
Depth to endosaturation: 122 to 183 cm (48 to 72 in)

Particle-size control section (weighted average):
Total clay content: 0.2 to 4 percent
Sand content: 95 to 99 percent
Weatherable minerals: 85 to 90 percent

A horizon:
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 1 to 3
Texture: fine sand
Total clay content: 0.2 to 3 percent
Sand content: 95 to 99 percent
Electrical conductivity (mmhos/cm): 0 to 0.5
Sodium adsorption ratio (SAR): 0 to 2
Reaction (pH): slightly to strongly alkaline (7.4 - 9.2)

C horizon:
Hue: 10YR or 2.5Y
Value: 4 to 7
Chroma: 2 to 4
Texture: fine sand
Total clay content: 0.5 to 4 percent
Sand content: 95 to 99 percent
Shell fragments: amount-0 to 5 percent; size- 2 to 75 mm
Electrical conductivity (mmhos/cm): 0 to 0.6
Sodium adsorption ratio (SAR): 0 to 4
Reaction (pH): slightly alkaline to very strongly alkaline (7.4 - 9.2)

Cg horizon:
(this horizon is absent in some pedons)
Hue: 10YR, 2.5Y, 10Y, 5GY, or N
Value: 4 to 7
Chroma: 0 to 2
Texture: fine sand
Total clay content: 0.9 to 4 percent
Sand content: 95 to 99 percent
Redox concentrations: amount-0 to 15 percent; color-shades of brown, yellow, or red
Shell fragments: amount-0 to 10 percent; size- 2 to 75 mm
Electrical conductivity (mmhos/cm): 0 to 0.6
Sodium adsorption ratio (SAR): 0 to 2
Reaction (pH): moderately alkaline to very strongly alkaline (7.9 - 9.2)

COMPETING SERIES:
This is the Galveston series in the same family. Similar soils are Cheniere, Daggerhill, Falfurrias, and Greenhill series.
Galveston soils: have electrical conductivity values greater than 1 ds/m; endosaturation within 76 cm of the soil surface.
Cheniere soils: have carbonatic mineralogy
Daggerhill and Greenhill soils: have more than 90 percent resistant minerals
Falfurrias soils: are in an ustic soil moisture regime

GEOGRAPHIC SETTING:
Parent material: eolian beach sands derived from igneous, metamorphic, and sedimentary rock
Landscape: barrier island
Landform: foredune
Slope: 0 to 3 percent
Precipitation Pattern: Precipitation is generally uniform throughout the year with slight peaks in the spring and fall months
Mean annual precipitation: 1143 to 1295 mm (45 to 51 in)
Mean annual air temperature: 20.6 to 21.7 C (69 to 71 degrees F)
Frost-free period: 275 to 300 days
Elevation: 0.9 to 2.4 m (1 to 8 ft)

GEOGRAPHICALLY ASSOCIATED SOILS:
These are the Galveston and Nass series.
Galveston soils: are on a back-barrier flat landform
Nass soils: very poorly drained and are in depressions

DRAINAGE AND PERMEABILITY:
Drainage class: somewhat excessive
Permeability class: rapid (rapid saturated hydraulic conductivity)
Runoff: negligible
Flooding: occasional frequency, for brief duration, during the months of June to October due to tropical storms.
Seasonal water table: Endosaturation occurs between depths of 122 to 183 cm (4 to 6 ft) of the surface during the months of November to May in most years.

USE AND VEGETATION:
Major uses: wildlife habitat
Native vegetation: seaoats, sea purslane, beach evening primrose, railroad vine, beach morning glory, and bitter panicum.
Ecological sites assigned to phases and components of this series are listed below. Current ecological site assignments are in Web Soil Survey. Components of this series include the following ecological sites: Northern Coastal Sand (R150BY530TX)

DISTRIBUTION AND EXTENT:
General area: The upper Texas Gulf Coast mostly on Galveston and Follets Island
Land Resource Region: Atlantic and Gulf Coast Lowland Forest and Crop Region(T)
Major Land Resource Areas: 150B - Gulf Coast Saline Prairies
Extent: small

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Temple, Texas

SERIES PROPOSED: Galveston County, Texas, 2020. The name is a derivative of San Luis Pass.

REMARKS: The series was formerly included in the Galveston series. The series was separated based on differences in water table depth, vegetation, and landform.

Diagnostic horizons and features recognized in this pedon are:
Particle-size control section: 25 to 100 cm (10 to 40 in)
Ochric epipedon: 0 to 22 cm (0 to 9 in) (A horizon)
Endosaturation: 146 to 203 cm (58 to 80 in) (Cg1 and Cg2 horizons)

Additional Comments: None

ADDITIONAL DATA: KSSL Data from a representative location S2002TX039001 (lab pedon number 03N0165) which was part of a mineralogy study of selective sandy soils of barrier islands and strand plains. MLRA Soil Survey Office data are available on location S2019TX1677070 at the series type location.

TAXONOMIC VERSION: Keys to Soil Taxonomy, Twelfth Edition, 2014.

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National Cooperative Soil Survey
U.S.A.