Natural Resources
Conservation Service
Major Land Resource Area 077C
Major Land Resource Area
Accessed: 04/20/2026
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1
Select an ecological site
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.
Ecological site list
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interactive key
precipitation
frost free days
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Viewing 12 of 12
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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
-
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
Ecological site map
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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.
Briefcase
Add ecological sites and Major Land Resource Areas to your briefcase by clicking on the briefcase (
) icon wherever it occurs. Drag and drop items to reorder. Cookies are used to store briefcase items between browsing sessions. Because of this, the number of items that can be added to your briefcase is limited, and briefcase items added on one device and browser cannot be accessed from another device or browser. Users who do not wish to place cookies on their devices should not use the briefcase tool. Briefcase cookies serve no other purpose than described here and are deleted whenever browsing history is cleared.
Ecological sites
Major Land Resource Areas
Ecological site photos
Tools
Filter by
interactive key
precipitation
frost free days
more..
clear all
Type
Image size
Done
Filters
Interactive key
Precipitation
Frost free days
Elevation
Slope
Landform
Parent material origin
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
Site moderately to strongly saline (>8mmhos/cm) within 20” (50cm) and dominated by salt tolerant species
R077CY689TX – Wet Saline 16-21" PZ
R077CY689TX – Wet Saline 16-21" PZ
Soils without strong saline soil
loamy soil texture (18-35% clay), along stream flood plains
R077CY023TX – Draw 16-21" PZ
R077CY023TX – Draw 16-21" PZ
clayey soil texture (>35% clay), in closed basin depressions
R077CY027TX – Playa 16-21" PZ
R077CY027TX – Playa 16-21" PZ
Soils are very shallow to shallow (8-20"(20-50cm))
Soil depth moderately deep to very deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
Soils are very shallow (<10”(25cm) to root restricting layer
R077CY037TX – Very Shallow 16-21" PZ
R077CY037TX – Very Shallow 16-21" PZ
Soil depth shallow (10-20” (25-50cm)) with a sandy soil texture
R077CY056NM – Sandy Plains
R077CY056NM – Sandy Plains
Soils affected by chemistry
Soils NOT affected by chemistry
Soils highly calcareous (>15% CCE) violent effervescence. Soils are skeletal (>35% by volume) in the subsoil, below 20”(50cm)
R077CY028TX – Limy Upland 16-21" PZ
R077CY028TX – Limy Upland 16-21" PZ
Soils highly calcareous (>15% CCE) violent effervescence. Soils are NOT skeletal (>35% by volume) in the subsoil, below 20”(50cm)
R077CY026TX – High Lime 16-21" PZ
R077CY026TX – High Lime 16-21" PZ
Loamy Fine Sand and fine Sand Surface, slopes 5 percent or less, uplands and shallow swales
R077CY035TX – Sandy 16-21" PZ
R077CY035TX – Sandy 16-21" PZ
Loam and clay loam Surface, slopes 0 to 5 percent or less, moderately alkaline, Deep to Very Deep, nearly level to moderately sloping upland plateau.
R077CY022TX – Deep Hardland 16-21" PZ
R077CY022TX – Deep Hardland 16-21" PZ
Fine Sand and Loamy Fine Sand Surface, slopes 0 to 5 percent or less, Duned ridges, little structure
R077CY034TX – Sand Hills 16-21" PZ
R077CY034TX – Sand Hills 16-21" PZ
Fine Sand and Loamy Fine Sand Surface, slopes 2 percent or less, nearly level to gently undulating plains
R077CY052NM – Loamy Sand
R077CY052NM – Loamy Sand
Fine Sandy Loam surface, slopes 5 percent or less, uplands and in shallow playas or depressions and swales
R077CY036TX – Sandy Loam 16-21" PZ
R077CY036TX – Sandy Loam 16-21" PZ
Long term average mean annual precipitation
- No filter
- 40 – 50cm (16 – 20in)
—
cm
Long term average frost free days
- No filter
- 150 – 170days
- 170 – 190days
—
days
- No filter
- 600 – 800m (2000 – 2600ft)
- 800 – 1000m (2600 – 3300ft)
- 1000 – 1200m (3300 – 3900ft)
- 1200 – 1400m (3900 – 4600ft)
- 1400 – 1600m (4600 – 5200ft)
- 1600 – 1800m (5200 – 5900ft)
—
m
- No filter
- 0 – 3%
- 3 – 5%
- 5 – 10%
- 10 – 15%
- 15 – 20%
- 20 – 25%
- 25 – 30%
- 30 – 35%
- 35 – 40%
- 40 – 45%
—
%
- No filter
- Closed depression
- Depression
- Drainageway
- Draw
- Dune
- Escarpment
- Flood plain
- Hill
- Interdune
- Plain
- Playa
- Playa dune
- Playa floor
- Playa slope
- Playa step
- Pluvial lake (relict)
- Valley flat
- Valley side
- No filter
- Limestone and sandstone
- Limestone and shale
- Limestone, sandstone and shale
- Metamorphic and sedimentary
- No filter
- Alluvium
- Eolian deposits
- Lacustrine deposits
- Residuum
Soil surface texture
- No filter
- Clay
- Clay loam
- Fine sand
- Fine sandy loam
- Loam
- Loamy fine sand
- Sandy clay
- Sandy clay loam
- Silty clay loam
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Ecological site keys
MLRA 77C ES Key
I.
Site that receives significant additional moisture from runoff of adjacent slopes or intermittent/perennial streams or a water table
A.
Site moderately to strongly saline (>8mmhos/cm) within 20” (50cm) and dominated by salt tolerant species
... R077CY689TX – Wet Saline 16-21" PZ
B.
Soils without strong saline soil
II.
Site does NOT receive additional moisture from runoff
A.
Soils are very shallow to shallow (8-20"(20-50cm))
1
Soils are very shallow (<10”(25cm) to root restricting layer
... R077CY037TX – Very Shallow 16-21" PZ
B.
Soil depth moderately deep to very deep (>20” (50cm)) without root restricting layer that inhibits the productivity potential
1
Soils affected by chemistry
i.
Soils highly calcareous (>15% CCE) violent effervescence. Soils are skeletal (>35% by volume) in the subsoil, below 20”(50cm)
... R077CY028TX – Limy Upland 16-21" PZ
ii.
Soils highly calcareous (>15% CCE) violent effervescence. Soils are NOT skeletal (>35% by volume) in the subsoil, below 20”(50cm)
... R077CY026TX – High Lime 16-21" PZ
2
Soils NOT affected by chemistry
i.
Loamy Fine Sand and fine Sand Surface, slopes 5 percent or less, uplands and shallow swales
... R077CY035TX – Sandy 16-21" PZ
ii.
Loam and clay loam Surface, slopes 0 to 5 percent or less, moderately alkaline, Deep to Very Deep, nearly level to moderately sloping upland plateau.
... R077CY022TX – Deep Hardland 16-21" PZ
iii.
Fine Sand and Loamy Fine Sand Surface, slopes 0 to 5 percent or less, Duned ridges, little structure
... R077CY034TX – Sand Hills 16-21" PZ
iv.
Fine Sand and Loamy Fine Sand Surface, slopes 2 percent or less, nearly level to gently undulating plains
... R077CY052NM – Loamy Sand
v.
Fine Sandy Loam surface, slopes 5 percent or less, uplands and in shallow playas or depressions and swales
... R077CY036TX – Sandy Loam 16-21" 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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