Natural Resources
Conservation Service
Major Land Resource Area 067B
Major Land Resource Area
Accessed: 04/24/2026
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1
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Select an ecological site using the list, keys, photos, briefcase, or quick search option located on this page. -
2
Explore the ecological site description
Next, learn more about the selected ecological site and its characteristic dynamics by browsing the ecological site description and exploring alternative state and transition model formats.
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Zoom in to display soil survey map units for an area of interest, and zoom out to display MLRAs. Select a map unit polygon to view ecological sites correlated to that map unit. View a brief description of an ecological site by clicking on its name in the map popup. Soil survey correlations may not be accurate, and ecological site classification of a location should always be verified in the field. Each selection may require the transfer of several hundred KB of data.
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Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
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Type
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Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
Parent material kind
Soil texture
Additional run-on moisture
No additional run-on moisture
Redoximorphic features and/or a water table within 4 feet of the soil surface
No redoximorphic features and/or water table within 4 feet of the soil surface
Visible salts present in the soil profile or on the soil surface
R067BY035CO – Salt Meadow
R067BY035CO – Salt Meadow
No visible salts present in the soil profile or on the soil surface
Subsoil textures of coarse sand, fine sand, loamy coarse sand, loamy sand, and/or loamy fine sand
R067BY029CO – Sandy Meadow
R067BY029CO – Sandy Meadow
Subsoil textures other than sandy
R067BY038CO – Wet Meadow
R067BY038CO – Wet Meadow
Subject to flooding (rare, occasional, frequent, or very frequent)
Not subject to flooding
Subsoil textures of coarse sand, sand, loamy coarse sand, loamy sand, or loamy fine sand
R067BY031CO – Sandy Bottomland
R067BY031CO – Sandy Bottomland
Subsoil textures other than sandy
Visible salts present in the soil profile or on the soil surface
R067BY037CO – Saline Overflow
R067BY037CO – Saline Overflow
No visible salts present in the soil profile or on the soil surface
R067BY036CO – Overflow
R067BY036CO – Overflow
Closed depression or playa that may pond water
R067BY010CO – Closed Depression
R067BY010CO – Closed Depression
'Slickspots' or bare areas of high sodium and surface textures of loam, clay loam, or clay
R067BY033CO – Salt Flat
R067BY033CO – Salt Flat
Bedrock within 40 inches of the soil surface
Bedrock deeper than 40 inches from the soil surface
Shale bedrock
Sandstone bedrock
R067BY056CO – Sandstone Breaks
R067BY056CO – Sandstone Breaks
Limestone bedrock
R067BY060CO – Limestone Breaks
R067BY060CO – Limestone Breaks
Siltstone bedrock
R067BY039CO – Shallow Siltstone
R067BY039CO – Shallow Siltstone
<6% slope
R067BY045CO – Shaly Plains
R067BY045CO – Shaly Plains
>6% slope
R067BY044CO – Shale Breaks
R067BY044CO – Shale Breaks
>15% rock fragments on the surface and/or in the subsoil
R067BY063CO – Gravel Breaks
R067BY063CO – Gravel Breaks
<15% rock fragments on the surface and/or in the subsoil
Sandy surface and subsoil textures (sand, loamy sand, sandy loam)
Surface and subsoil textures other than sandy
Rough, steep, dune-type appearance (cat-steps or terracettes are typically apparent)
R067BY022CO – Choppy Sands
R067BY022CO – Choppy Sands
No rough, steep, dune-type appearance
>5% slope with undulating/rolling topography
R067BY015CO – Deep Sand
R067BY015CO – Deep Sand
<5% slope with nearly level topography
R067BY024CO – Sandy Plains
R067BY024CO – Sandy Plains
Visible salts present in the soil profile or on the soil surface
R067BY047CO – Alkaline Plains
R067BY047CO – Alkaline Plains
No visible salts present in the soil profile or on the soil surface
>6% slope
R067BY008CO – Loamy Slopes
R067BY008CO – Loamy Slopes
<6% slope
Surface texture of clay loam, clay, or silty clay
R067BY042CO – Clayey Plains
R067BY042CO – Clayey Plains
Other surface texture
Calcium carbonates at the surface
R067BY009CO – Siltstone Plains
R067BY009CO – Siltstone Plains
No calcium carbonates at the surface
R067BY002CO – Loamy Plains
R067BY002CO – Loamy Plains
Long term average mean annual precipitation
- No filter
- 35 – 40cm (14 – 16in)
—
cm
Long term average frost free days
- No filter
- 110 – 130days
—
days
- No filter
- 1000 – 1200m (3300 – 3900ft)
- 1200 – 1400m (3900 – 4600ft)
- 1400 – 1600m (4600 – 5200ft)
- 1600 – 1800m (5200 – 5900ft)
- 1800 – 2000m (5900 – 6600ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
- 45 – 50%
- 50 – 60%
—
%
- No filter
- Depression
- Drainageway
- Draw
- Dune
- Escarpment
- Fan
- Flood plain
- Flood-plain step
- Hill
- Hillslope
- Interdune
- Interfluve
- Knob
- Playa
- Ridge
- Scarp
- Stream terrace
- Swale
- Terrace
- No filter
- Limestone and sandstone
- Sandstone, unspecified
- Shale, unspecified
- Siltstone, unspecified
- No filter
- Alluvium
- Eolian deposits
- Eolian sands
- Loess
- Outwash
- Residuum
Soil surface texture
- No filter
- Clay
- Clay loam
- Fine sand
- Fine sandy loam
- Loam
- Loamy fine sand
- Loamy sand
- Sand
- Sandy clay
- Silty clay loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 67B Key
I.
Additional run-on moisture
A.
Redoximorphic features and/or a water table within 4 feet of the soil surface
2
No visible salts present in the soil profile or on the soil surface
i.
Subsoil textures of coarse sand, fine sand, loamy coarse sand, loamy sand, and/or loamy fine sand
... R067BY029CO – Sandy Meadow
B.
No redoximorphic features and/or water table within 4 feet of the soil surface
1
Subject to flooding (rare, occasional, frequent, or very frequent)
i.
Subsoil textures of coarse sand, sand, loamy coarse sand, loamy sand, or loamy fine sand
... R067BY031CO – Sandy Bottomland
ii.
Subsoil textures other than sandy
a.
Visible salts present in the soil profile or on the soil surface
... R067BY037CO – Saline Overflow
2
Not subject to flooding
ii.
'Slickspots' or bare areas of high sodium and surface textures of loam, clay loam, or clay
... R067BY033CO – Salt Flat
II.
No additional run-on moisture
A.
Bedrock within 40 inches of the soil surface
1
Shale bedrock
B.
Bedrock deeper than 40 inches from the soil surface
2
<15% rock fragments on the surface and/or in the subsoil
i.
Sandy surface and subsoil textures (sand, loamy sand, sandy loam)
a.
Rough, steep, dune-type appearance (cat-steps or terracettes are typically apparent)
... R067BY022CO – Choppy Sands
b.
No rough, steep, dune-type appearance
ii.
Surface and subsoil textures other than sandy
a.
Visible salts present in the soil profile or on the soil surface
... R067BY047CO – Alkaline Plains
b.
No visible salts present in the soil profile or on the soil surface
2)
<6% slope
b)
Other surface texture
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Visible Salts . Crystals of salt (usually white, like table salt) or masses of crystals of salt visible with the naked eye.
-
Cat-steps/Terracettes . Small, irregular step-like forms on steep hillslopes, especially in pasture, formed by creep or erosion of surficial materials that may be induced or enhanced by trampling of livestock such as sheep or cattle.
-
Flooding Frequency Classes . *None, No reasonable possibility of flooding; near 0 percent chance of flooding in any year or less than 1 time in 500 years. *Very Rare, Flooding is very unlikely but possible under extremely unusual weather conditions; less than 1 percent chance of flooding in any year or less than 1 time in 100 years but more than 1 time in 500 years. *Rare, Flooding is unlikely but possible under unusual weather conditions; 1 to 5 percent chance of flooding in any year or nearly 1 to 5 times in 100 years.
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Flooding Frequency Classes . *Occasional, Flooding is expected infrequently under usual weather conditions; 5 to 50 percent chance of flooding in any year or 5 to 50 times in 100 years. *Frequent, Flooding is likely to occur often under usual weather conditions; more than a 50 percent chance of flooding in any year or more than 50 times in 100 years, but less than a 50 percent chance of flooding in all months in any year. *Very Frequent, Flooding is likely to occur very often under usual weather conditions; more than a 50 percent chance of flooding in all months of any year.
-
Ponding Frequency Classes . *None, No reasonable possibility of ponding; near 0 percent chance of ponding in any year. *Rare, Ponding unlikely but possible under unusual weather conditions; from nearly 0 to 5 percent chance of ponding in any year or nearly 0 to 5 times in 100 years. *Occasional, Ponding is expected infrequently under usual weather conditions; 5 to 50 percent chance of ponding in any year or nearly 5 to 50 times in 100 years. *Frequent, Ponding is likely to occur often under usual weather conditions; more than a 50 percent chance of ponding in any year or more than 50 times in 100 years.
-
Redoximorphic Features . Features formed by the processes of reduction, translocation, and/or oxidation of Iron (Fe) and Manganese (Mn) oxides; formerly called mottles or low-chroma colors. (Ex. Rust colored features or light-gray colored features on soil peds/faces).
-
Slickspots . Areas having a puddled or crusted (or salt crusted), very smooth, nearly impervious surface. The underlying material is dense and massive or columnar. The material ranges from extremely acid to very strongly alkaline and from sand to clay.
The Ecosystem Dynamics Interpretive Tool is an information system framework developed by the USDA-ARS Jornada Experimental Range, USDA Natural Resources Conservation Service, and New Mexico State University.
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