LOCATION SHAW                    MO

Tentative Series
IRD. RET-RSA
06/2026

SHAW SERIES

Depth class: Very deep
Drainage class: Somewhat poorly drained
Saturated hydraulic conductivity: Moderately high to high
Parent material: Human-transported material derived from nearby loess deposits and overlies Peoria loess, where it is present.
Geomorphic location: Leveled land and mechanically graded areas on interfluves and ridges of hills
Slope range: 0 to 3
Mean annual temperature: 12 degrees C
Mean annual precipitation: 1050 millimeters

TAXONOMIC CLASS: Fine-silty, spolic, mixed, superactive, mesic Aquic Hapludolls
Fine-silty, spolic, mixed, superactive, mesic Aquic Hapludolls

TYPICAL PEDON: Shaw silt loam, 1 percent slopes on a residential lot under sod grass in an area reshaped by heavy equipment. (Colors are for moist soil unless otherwise noted.)

^Au1--0 to 14 centimeters; 85 percent very dark gray (10YR 3/1) and 15 percent dark grayish brown (10YR 4/2) silty clay loam; moderate thick platy parting to moderate medium granular structure; friable; common very fine and fine roots throughout; common very fine dendritic tubular and very fine interstitial pores; 3 percent gravel sized brick fragments, 2 percent gravel sized concrete fragments, and 2 percent glass gravel sized fragments; neutral (pH 6.9); clear smooth boundary

^Au2--14 to 44 centimeters; 80 percent very dark gray (10YR 3/1) and 20 percent brown (10YR 4/3) silty clay loam; weak medium subangular blocky parting to moderate fine subangular blocky structure; friable; common very fine and fine roots throughout; common very fine dendritic tubular and very fine interstitial pores; 2 percent gravel sized brick fragments, 2 percent gravel sized concrete fragments, and 1 percent bitumen (asphalt) gravel sized fragments; neutral (pH 7.2); clear smooth boundary. (Combined thickness of the ^A horizons is 25 to 47 cm thick)

^Cu1--44 to 68 centimeters; black (10YR 2/1) silty clay loam; relict moderate medium subangular blocky structure; firm; common very fine interstitial pores; 3 percent fine faint irregular dark grayish brown (10YR 4/2), moist, iron depletions in matrix; 1 percent gravel sized brick fragments and 1 percent gravel sized bitumen (asphalt) fragments; slightly acid (pH 6.3); gradual smooth boundary

^Cu2--68 to 94 centimeters; black (N 2.5/), silty clay loam; relict moderate medium subangular blocky structure; firm; common (1.0) very fine interstitial pores; 5 percent fine faint irregular dark gray (10YR 4/1), moist, iron depletions in matrix; 1 percent gravel sized brick fragments; moderately acid (pH 6.0); clear smooth boundary. (Combined thickness of ^C horizons is 35 cm or more thick)

2Btgb1--94 to 119 centimeters; black (10YR 2/1) silty clay loam; moderate medium prismatic structure; firm; common very fine roots throughout; common very fine vesicular and very fine dendritic tubular and very fine interstitial pores; 8 percent faint black (10YR 2/1), moist, clay films on all faces of peds; 15 percent fine faint irregular dark grayish brown (10YR 4/2), moist, iron depletions in matrix; fragments; slightly acid (pH 6.2); gradual wavy boundary

2Btgb2--119 to 129 centimeters; very dark gray (10YR 3/1) silty clay loam; moderate coarse prismatic structure; firm; few very fine roots throughout; common very fine vesicular and very fine interstitial pores; 6 percent faint very dark gray (10YR 3/1), moist, clay films on all faces of peds; 3 percent fine prominent irregular yellowish brown (10YR 5/6), moist, iron-manganese masses in matrix and 35 percent fine faint irregular dark grayish brown (10YR 4/2), moist, iron depletions in matrix; fragments; slightly acid (pH 6.5); gradual wavy boundary

2Btgb3--129 to 146 centimeters; 80 percent dark grayish brown (10YR 4/2) and 20 percent dark gray (10YR 4/1) silty clay loam; moderate coarse prismatic structure; firm; few medium roots throughout; common very fine vesicular and interstitial pores; 2 percent faint dark gray (10YR 4/1), moist, clay films on all faces of peds; 16 percent fine prominent irregular strong brown (7.5YR 5/8), moist, iron-manganese masses in matrix; neutral (pH 6.7); clear wavy boundary; dry when described

2Btgb4--146 to 175 centimeters; 90 percent grayish brown (10YR 5/2) and 10 percent gray (10YR 5/1) silt loam; 2 percent sand; weak very coarse prismatic structure; firm; common very fine vesicular pores; 22 percent fine prominent irregular yellowish brown (10YR 5/8), moist, iron-manganese masses in matrix; neutral (pH 6.9); gradual wavy boundary; dry when described

2Btgb5--175 to 192 centimeters; gray (10YR 5/1) silt loam; weak coarse prismatic structure; firm; common very fine vesicular pores; 30 percent fine prominent irregular yellowish brown (10YR 5/8), moist, iron-manganese masses in matrix; dry when described; neutral (pH 6.9); clear smooth boundary. (Combined thickness of Btgb horizons is 0 to 150 cm thick)

2Cg--192 to 200 centimeters; light gray (10YR 7/1) silt loam; massive; friable; common very fine vesicular pores; 8 percent fine prominent irregular yellowish brown (10YR 5/8), moist, iron-manganese masses in matrix; neutral (pH 7.1); dry when described

TYPE LOCATION:
St. Louis County, Missouri; located 112 feet north and 195 feet west of the intersection between Anderson Ave and North Newstead Ave, in the side yard of a residential lot.

USGS Quadrangle: Granite City, IL-MO
Latitude: 38.6771520
Longitude: -90.2319500
Datum: WGS84
Coordinate source: From hand-held GPS

RANGE IN CHARACTERISTICS:
Thickness of human-transported materials: 70 to 200 centimeters
Thickness of mollic epipedon: 25 to 47 centimeters
Depth to bedrock: Greater than 200 centimeters
Depth to seasonal high-water table: 40 to 75 centimeters
Soil reaction: slightly acid to moderately alkaline (6.1 to 8.3 pH)
Particle-size control section (weighted average):
Clay content--18 to 35 percent
Sand content--2 to 15 percent
Artifact content--0 to 13 percent
Combined rock and artifact content: 0 to 10 percent

^A(u) horizons:
Hue-- 10YR
Value--2 to 4
Chroma--1 to 3
Texture--silt loam
Rock fragment content--0 to 5 percent
Artifact content--0 to 10 percent

^C(u) horizons:
Hue-- 10YR,7.5YR, 2.5Y, or N
Value--2 to 5
Chroma--1 to 6
Texture--silt loam or silty clay loam
Rock fragments--0 to 5 percent
Artifact content--0 to 13 percent

2Btb horizons (when present):
Hue--10YR or 7.5YR
Value--2 to 5
Chroma--1 to 6
Texture--silt loam or silty clay loam

2Btgb horizons:
Hue--10YR
Value--4 to 6
Chroma--1 or 2
Texture--silt loam or silty clay loam

2Cg horizons are present in some pedons.

COMPETING SERIES:
There are no competing series. The Muscatine and Joy soils are in a similar family but do not have a surface mantle of human-transported material.

GEOGRAPHIC SETTING:
Parent material: Human-transported material derived from nearby loess deposits and overlies Peoria loess, where it is present.
Landscape: Loess hills
Landform: Interfluves in the loess hills
Anthropogenic landform: leveled land where truncation and grading of soil has occurred.
Slope: 0 to 3 percent
Elevation: 120 to 250 meters
Frost-free period: 184 to 228 days
Mean annual temperature: 11 to 14 degrees C
Mean annual precipitation: 940 to 1194 millimeters

GEOGRAPHICALLY ASSOCIATED SOILS: These are the Fishpot, Harvester, and Vandeventer soils which have mantles of human-transported material, and Winfield soils which formed in deep undisturbed loess deposits.

Harvester soils have aquic conditions beginning below 55 centimeters and have an ochric epipedon; found on fills on interfluves, sideslopes, ridges, shoulders, summits, and backslopes of hills.
Vandeventer soils are in the loamy-skeletal particle-size control section; found on fills on interfluves, sideslopes, ridges, summits, shoulders, and backslopes of hills.
Fishpot soils formed in alluvial materials and are subject to frequent flooding; found on fills on stream terraces and flood plains of river valleys.
Winfield soils have aquic conditions beginning below 75 centimeters; found on ridges, sideslopes, summits, shoulders, and backslopes of hills and on treads of high stream terraces.

DRAINAGE AND SATURATED HYDRAULIC CONDUCTIVITY:
Drainage Class: Somewhat Poorly drained
Surface Runoff: Medium
Saturated Hydraulic Conductivity Class: Moderately high except where compacted
Flooding: None
Ponding: None

USE AND VEGETATION:
Major uses are for residential, commercial, and recreational applications in an urban setting. Vegetation may include managed and unmanaged plant communities with a mix of native and non-native species. Many areas are vegetated with non-native ornamental landscaping or turfgrass. Some areas exhibit weedy, invasive, and primary succession vegetation communities (e.g., abandoned lots and other unmanaged areas).

DISTRIBUTION AND EXTENT:
Urban and other areas with human-modified landscapes in the Central Feed Grains and Livestock Region, Major Land Resource Area 115. These soils are of moderate extent.

SOIL SURVEY REGIONAL OFFICE (SSRO) RESPONSIBLE: Raleigh, North Carolina (Special Projects Office)

SERIES PROPOSED: St. Louis County, Missouri, 2025

REMARKS:
Typical Pedon Taxonomic Features:
Mollic epipedon--The zone from 0 to 44 centimeters
Human-transported material--The zone from 0 to 94 cm
Lithologic discontinuity--At a depth of 94 centimeters
Particle-size control section-- The zone from 25 to 100 centimeters
Aquic conditions--Beginning at a depth of 44 centimeters

Taxonomic Version: Keys to Soil Taxonomy, 13th Edition (2022)

Other: Shaw soils are mapped on broad flat divides that supported historic prairies prior to disturbance by earth-moving equipment. The amount of filling, cutting, alteration of existing soil is variable from place to place.

ADDITIONAL DATA:
NASIS User Pedon ID: 2024MO510088

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National Cooperative Soil Survey
U.S.A.