Natural Resources
Conservation Service
Major Land Resource Area 077A
Major Land Resource Area
Accessed: 04/24/2026
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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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Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
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i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
-
i
Key Characteristics
- Sites concentrated around the east flanks of Crater lake
- Not as above
- Site occupying ash flows or alluvial fans
- Not as above
- Site found on all aspects
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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
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interactive key
precipitation
frost free days
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Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material kind
Soil texture
Site that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
Site does NOT receive additional moisture from runoff
Fine-textured soils with high shrink swell and wetness features (redoximorphic features) in the upper part of the soil. Site occurs in dips and swales that accumulate additional moisture into closed depressions with potential or apparent ponding. Site is very deep, with poorly drained, very slowly permeable soils on playas
R077AY005TX – Playa 16-22" PZ
R077AY005TX – Playa 16-22" PZ
Soils with greater than 18% and less than 35% clay in the subsoil. Site is very deep with well drained, moderately permeable soils on draws adjacent to uplands, on smaller drainageways without a defined flood plain
R077AY002TX – Draw 16-22" PZ
R077AY002TX – Draw 16-22" PZ
Loamy soils with depth to restrictive layer of very shallow (<25 cm (<10 in)) or shallow (25 to 50 cm (10 to 20 in)) over petrocalcic. Site is very shallow, well drained, and with moderately permeable soils on plains and interfluves
R077AY013TX – Very Shallow 16-22" PZ
R077AY013TX – Very Shallow 16-22" PZ
Coarse-loamy soils formed in calcareous mixed eolian deposits with highly calcareous subsoils (calcic horizons) within 100 cm (40 in) of the soil surface. Site is moderately deep to very deep, well drained, and moderately to slowly permeable soils on plains and interfluves
R077AY006TX – Limy Upland 16-22" PZ
R077AY006TX – Limy Upland 16-22" PZ
Fine-silty soils formed in calcareous silty parna with weakly developed subsoils (argillic horizons) in the subsoil, and with highly calcareous subsoils (calcic horizons) within 100 cm (40 in) of the soil surface. Site is very deep, well drained, and moderately permeable and occurs on parna dunes
R077AY004OK – Parna Dune 16-22" PZ
R077AY004OK – Parna Dune 16-22" PZ
Fine-silty and fine-loamy soils formed in calcareous loess and loamy eolian deposits with well-developed subsoils (argillic horizon) and loam or silt loam surface textures. Site is very deep, well drained, moderately permeable soils on plains and interfluves
R077AY015KS – Loamy Upland 16-22" PZ
R077AY015KS – Loamy Upland 16-22" PZ
Fine soils with formed in calcareous loess with well-developed subsoils (argillic horizon) and clay loam, silty clay loam, and silt loam surface textures. Site is very deep, well drained, moderately slowly to very slowly permeable soils on plains and interfluves
R077AY001TX – Deep Hardland 16-22" PZ
R077AY001TX – Deep Hardland 16-22" PZ
Soils with a surface texture of sandy loam or fine sandy loam and a well-developed subsoil (argillic horizon) of sandy loam, sandy clay loam, loam, or clay loam. Site is very deep with well drained, moderately permeable soils on sand sheets
R077AY012TX – Sandy Loam 16-22" PZ
R077AY012TX – Sandy Loam 16-22" PZ
Soils with a surface texture of loamy sand or loamy fine sand, and a well-developed and a well-developed subsoil (argillic horizon) of sandy loam, sandy clay loam, loam, or clay loam. Site is very deep with well drained, moderately permeable soils on sand sheets and low dunes
R077AY666TX – Sandy 16-22" PZ
R077AY666TX – Sandy 16-22" PZ
Soils with a surface texture of loamy fine sand, loamy sand, fine sand, or sand that have little or no subsoil accumulation of clay (no argillic horizon). Site is very deep with excessively drained, rapidly permeable soils on dunes
R077AY011TX – Sand Hills 16-22" PZ
R077AY011TX – Sand Hills 16-22" PZ
Long term average mean annual precipitation
- No filter
- 40 – 50cm (16 – 20in)
—
cm
Long term average frost free days
- No filter
—
days
- No filter
- 600 – 800m (2000 – 2600ft)
- 800 – 1000m (2600 – 3300ft)
- 1000 – 1200m (3300 – 3900ft)
- 1200 – 1400m (3900 – 4600ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
—
%
- No filter
- Draw
- Dune
- Escarpment
- Interdune
- Interfluve
- Parna dune
- Plain
- Playa
- Playa lake
- Playa rim
- Sand sheet
- No filter
- Alluvium
- Eolian deposits
- Eolian sands
- Lacustrine deposits
- Loess
- Loess, calcareous
- Parna
Soil surface texture
- No filter
- Clay
- Clay loam
- Fine sand
- Fine sandy loam
- Loam
- Loamy fine sand
- Loamy sand
- Silty clay
- Silty clay loam
- Silt loam
- Sandy loam
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Ecological site keys
MLRA 77A ES Key
I.
Site that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
A.
Fine-textured soils with high shrink swell and wetness features (redoximorphic features) in the upper part of the soil. Site occurs in dips and swales that accumulate additional moisture into closed depressions with potential or apparent ponding. Site is very deep, with poorly drained, very slowly permeable soils on playas
... R077AY005TX – Playa 16-22" PZ
B.
Soils with greater than 18% and less than 35% clay in the subsoil. Site is very deep with well drained, moderately permeable soils on draws adjacent to uplands, on smaller drainageways without a defined flood plain
... R077AY002TX – Draw 16-22" PZ
II.
Site does NOT receive additional moisture from runoff
A.
Loamy soils with depth to restrictive layer of very shallow (<25 cm (<10 in)) or shallow (25 to 50 cm (10 to 20 in)) over petrocalcic. Site is very shallow, well drained, and with moderately permeable soils on plains and interfluves
... R077AY013TX – Very Shallow 16-22" PZ
B.
Coarse-loamy soils formed in calcareous mixed eolian deposits with highly calcareous subsoils (calcic horizons) within 100 cm (40 in) of the soil surface. Site is moderately deep to very deep, well drained, and moderately to slowly permeable soils on plains and interfluves
... R077AY006TX – Limy Upland 16-22" PZ
C.
Fine-silty soils formed in calcareous silty parna with weakly developed subsoils (argillic horizons) in the subsoil, and with highly calcareous subsoils (calcic horizons) within 100 cm (40 in) of the soil surface. Site is very deep, well drained, and moderately permeable and occurs on parna dunes
... R077AY004OK – Parna Dune 16-22" PZ
D.
Fine-silty and fine-loamy soils formed in calcareous loess and loamy eolian deposits with well-developed subsoils (argillic horizon) and loam or silt loam surface textures. Site is very deep, well drained, moderately permeable soils on plains and interfluves
... R077AY015KS – Loamy Upland 16-22" PZ
E.
Fine soils with formed in calcareous loess with well-developed subsoils (argillic horizon) and clay loam, silty clay loam, and silt loam surface textures. Site is very deep, well drained, moderately slowly to very slowly permeable soils on plains and interfluves
... R077AY001TX – Deep Hardland 16-22" PZ
F.
Soils with a surface texture of sandy loam or fine sandy loam and a well-developed subsoil (argillic horizon) of sandy loam, sandy clay loam, loam, or clay loam. Site is very deep with well drained, moderately permeable soils on sand sheets
... R077AY012TX – Sandy Loam 16-22" PZ
G.
Soils with a surface texture of loamy sand or loamy fine sand, and a well-developed and a well-developed subsoil (argillic horizon) of sandy loam, sandy clay loam, loam, or clay loam. Site is very deep with well drained, moderately permeable soils on sand sheets and low dunes
... R077AY666TX – Sandy 16-22" PZ
H.
Soils with a surface texture of loamy fine sand, loamy sand, fine sand, or sand that have little or no subsoil accumulation of clay (no argillic horizon). Site is very deep with excessively drained, rapidly permeable soils on dunes
... R077AY011TX – Sand Hills 16-22" PZ
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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