Natural Resources
Conservation Service
Major Land Resource Area 041X
Major Land Resource Area
Accessed: 04/30/2026
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Next, learn more about the selected ecological site group and its characteristic dynamics by browsing the ecological site group description and exploring alternative state and transition model formats.
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Ecological site groups
Major Land Resource Areas
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Nauman criteria
Flooded (bottom position, flooded from the valley-side or over-bank)
Not Flooded (upland position, receives only precipitation)
Soils with a perennial high water-table (3-15 ft.)
Soils with seasonal (summer) water table (3-15 ft.)
Soils without a high water table (3-15 ft)
Soils sandy and gravelly with redox features
Soils loamy to clayey with redox features
Soils sandy loam to clay loam
Soils sandy
Soils sandy loam to clay loam
Soils clayey (vertic)
Slopes less than 15%
Slopes greater than 15%
Soils calcareous throughout
Soils non calcareous in upper 10 inches
Soils shallow (less than 20 inches deep)
Soils moderately deep to deep (30 to 60 inches)
Soils with a lime cemented hardpan
Soils with an argillic horizon
Soils shallow (less than 20 inches deep)
Soils moderately deep to deep (30 to 60 inches)
Soils underlain by granite, schist, rhyolite bedrock
Soils without an argillic horizon
Soils with an argillic horizon
Soils loamy fine sand to sandy loam
Soils with sandy loam surface 4 in. or thicker
Soils with sandy loam surface less than 4 in.
Soils with clay loam surface (not vertic)
Soils with a clayey surface (vertic)
Soils shallow (less than 20 inches deep)
Soils moderately deep and deep (30 to 60 inches)
Soils calcareous throughout
Soils non calcareous
Soils over limestone parent materials
Soils over granite, schist, gneiss, rhyolite (acid igneous)
Soils over basalt, andesite, welded tuff (basic igneous)
Soils calcareous throughout
Soils non calcareous in the upper 10 inches
Soils dark colored in the surface 5 inches (10YR, 4/2)
Soils sandy loam to clay loam
Soils clayey
Add criteria
Additional water
Uplands
Perennial water
041XESG09 – Riparian
041XESG09 – Riparian
Ephemeral water
Subsurface EC>4
041XESG10 – Saline Bottoms
041XESG10 – Saline Bottoms
Subsurface EC <4
Sand >50% & Clay <25% for surface and subsurface
041XESG13 – Sandy Bottoms
041XESG13 – Sandy Bottoms
Sand <50% & Clay >25% for surface and subsurface
041XESG01 – Bottoms
041XESG01 – Bottoms
>75% bedrock outcrop
041XESG08 – Outcrops
041XESG08 – Outcrops
<75% bedrock outcrop
Surface SAR >8, or Subsurface EC >8, or Surface EC >4
041XESG11 – Saline Hills
041XESG11 – Saline Hills
Surface SAR <8, or Subsurface EC <8, or Surface EC <4
Gypsum >5% surface or >10% subsurface
041XESG06 – Gypsum
041XESG06 – Gypsum
Gypsum <5% surface and <10% subsurface
EC >1.5 surface or >2 subsurface
041XESG12 – Saline Uplands
041XESG12 – Saline Uplands
EC <1.5 surface or <2 subsurface
slope >35% & >40% surface rock
041XESG02 – Breaks
041XESG02 – Breaks
slope <35% or <40% surface rock
Depth <30cm
041XESG16 – Very Shallow
041XESG16 – Very Shallow
depth: 30-55cm
041XESG15 – Shallow
041XESG15 – Shallow
depth >55cm
Rock >30% surface or >30% subsurface
041XESG04 – Deep Rocky
041XESG04 – Deep Rocky
Rock <30% surface and <30% subsurface
Clay >30% surface or >35% subsurface
041XESG03 – Clay Uplands
041XESG03 – Clay Uplands
Clay <30% surface and <35% subsurface
sand >75% or texture is Loamy Sand or sandier in surface & subsurface
041XESG14 – Sandy Uplands
041XESG14 – Sandy Uplands
sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
Clay <20% or texture is Sandy Loam or sandier in surface
041XESG07 – Loamy Uplands
041XESG07 – Loamy Uplands
Clay >20% or texture is Fine Sandy Loam or finer in surface
041XESG05 – Finer Uplands
041XESG05 – Finer Uplands
Additional water
Uplands
Perennial water
041XESG09 – Riparian
041XESG09 – Riparian
Ephemeral water
Subsurface EC >4 - 040XESG10 Saline Bottoms
Subsurface EC <4
Sand >50% & clay <25% for surface and subsurface - 040XESG13 Sandy Bottoms
Sand <50% or clay >25% for surface and subsurface - 040XESG01 Bottoms
Surface SAR >8
Surface SAR <8
Elevation - 2500-3700 ft
041XESG62 – Thornscrub Saline Hills
041XESG62 – Thornscrub Saline Hills
Elevation - 3700-4500 ft - 042BESG63 Semi-Desert Grassland Saline Hills
Elevation - 4500-6000 ft - 042BESG38 Madrean Woodland Saline Hills
Elevation - >6000 ft - 070BESG64 Temperate Forest Saline Hills
Gypsum >5% surface or >10% subsurface
Gypsum <5% surface or <10% subsurface
Elevation - 2500-3700 ft - 042AESG33 Gypsum Thornscrub
Elevation - 3700-4500 ft - 042BESG55 Gypsum Semi-Desert Grassland
Subsurface EC >8 or surface EC >4
Subsurface EC <8 and surface EC <4
Elevation - 2500-3700 ft
041XESG62 – Thornscrub Saline Hills
041XESG62 – Thornscrub Saline Hills
Elevation - 3700-4500 ft - 042BESG63 Semi-Desert Grassland Saline Hills
Elevation - 4500-6000 ft - 042BESG38 Madrean Woodland Saline Hills
Elevation - >6000 ft - 070BESG64 Temperate Forest Saline Hills
EC >1.5 surface or >2 subsurface
EC <1.5 surface and <2 subsurface
Elevation - 2500-3700 ft
041XESG39 – Thornscrub Saline Uplands
041XESG39 – Thornscrub Saline Uplands
Elevation - 3700-4500 ft
041XESG65 – Semi-Desert Grassland Saline Uplands
041XESG65 – Semi-Desert Grassland Saline Uplands
Elevation - 4500-6000 ft - 042BESG66 Madrean Woodland Saline Uplands
Elevation - >6000 ft - 070BESG67 Temperate Forest Saline Uplands
Slope >35% & >40% surface rock - 038XESG19 Marean Woodland Breaks
Slope <35% or <40% surface rock
Depth <30cm
Depth: 30-55cm
Depth >55cm
Elevation - 2500-3700 ft - 040XESG46 Very Shallow Thornscrub
Elevation - 3700-4500 ft - 042AESG47 Very Shallow Semi-Desert Grassland
Elevation - 4500-6000 ft - 042AESG48 Very Shallow Madrean Woodland
Elevation - >6000 ft - 070BESG49 Very Shallow Temperate Forest
Elevation - 2500-3700 ft - 040XESG42 Shallow Thornscrub
Elevation - 3700-4500 ft - 042AESG43 Shallow Semi-Desert Grassland
Elevation - 4500-6000 ft - 038XESG44 Shallow Madrean Woodland
Elevation - >6000 ft - 070BESG45 Shallow Temperate Forest
Rock >30% surface or >30% subsurface
Rock <30% surface and <30% subsurface
Elevation - 3700-4500 ft - 042AESG26 Deep Rocky Semi-Desert Grassland
Elevation - 4500-6000 ft - 042BESG27 Deep Rocky Madrean Woodland
Clay >30% surface or >35% subsurface
Clay <30% surface and <35% subsurface
Elevation - 2500-3700 ft - 040XESG21 Thornscrub Clay Uplands
Elevation - 3700-4500 ft
041XESG22 – Semi-Desert Grassland Clay Uplands
041XESG22 – Semi-Desert Grassland Clay Uplands
Elevation - 4500-6000 ft - 038XESG23 Madrean Woodland Clay Uplands
Elevation - >6000 ft - 038XESG24 Temperate Forest Clay Uplands
Sand >75% or texture is loamy sand or sandier in surface & subsurface
Sand <75% or texture is sandy loam or finer in surface & subsurface
Elevation - 2500-3700 ft - 042CESG40 Thornscrub Sandy Uplands
Elevation - 3700-4500 ft - 042BESG41 Semi-Desert Grassland Sandy Uplands
Elevation - 4500-6000 ft - 042BESG68 Madrean Woodland Sandy Uplands
Clay <20% or texture is sandy loam or sandier in surface
Clay >20% or texture is finer than sandy loam in surface
Elevation - 2500-3700 ft - 040XESG34 Thornscrub Loamy Uplands
Elevation - 3700-4500 ft
041XESG35 – Semi-Desert Grassland Loamy Uplands
041XESG35 – Semi-Desert Grassland Loamy Uplands
Elevation - 4500-6000 ft - 042BESG36 Madrean Woodland Loamy Uplands
Elevation - >6000 ft - 070BESG37 Temperate Forest Loamy Uplands
Elevation - 2500-3700 ft - 042AESG29 Thornscrub Finer Uplands
Elevation - 3700-4500 ft
041XESG30 – Semi-Desert Grassland Finer Uplands
041XESG30 – Semi-Desert Grassland Finer Uplands
Elevation - 4500-6000 ft - 070BESG31 Madrean Woodland Finer Uplands
Elevation - >6000 ft - 070BESG32 Temperate Forest Finer Uplands
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Ecological site group keys
16-20” PZ within Land Resource Unit 41.AZ1, Mexican Oak-Pine Forest and Oak Savannah
I.
Flooded (bottom position, flooded from the valley-side or over-bank)
A.
Soils with a perennial high water-table (3-15 ft.)
1
Soils sandy and gravelly with redox features
2
Soils loamy to clayey with redox features
B.
Soils with seasonal (summer) water table (3-15 ft.)
1
Soils sandy loam to clay loam
C.
Soils without a high water table (3-15 ft)
1
Soils sandy
2
Soils sandy loam to clay loam
3
Soils clayey (vertic)
II.
Not Flooded (upland position, receives only precipitation)
A.
Slopes less than 15%
1
Soils calcareous throughout
a.
Soils shallow (less than 20 inches deep)
1
Soils with a lime cemented hardpan
b.
Soils moderately deep to deep (30 to 60 inches)
1
Soils with an argillic horizon
2
Soils non calcareous in upper 10 inches
a.
Soils shallow (less than 20 inches deep)
1
Soils underlain by granite, schist, rhyolite bedrock
b.
Soils moderately deep to deep (30 to 60 inches)
1
Soils without an argillic horizon
a.
Soils loamy fine sand to sandy loam
2
Soils with an argillic horizon
a.
Soils with sandy loam surface 4 in. or thicker
b.
Soils with sandy loam surface less than 4 in.
c.
Soils with clay loam surface (not vertic)
d.
Soils with a clayey surface (vertic)
B.
Slopes greater than 15%
1
Soils shallow (less than 20 inches deep)
a.
Soils calcareous throughout
1
Soils over limestone parent materials
b.
Soils non calcareous
1
Soils over granite, schist, gneiss, rhyolite (acid igneous)
2
Soils over basalt, andesite, welded tuff (basic igneous)
2
Soils moderately deep and deep (30 to 60 inches)
a.
Soils calcareous throughout
1
Soils dark colored in the surface 5 inches (10YR, 4/2)
b.
Soils non calcareous in the upper 10 inches
1
Soils sandy loam to clay loam
2
Soils clayey
3
Add criteria
Talbot-Nauman Key
I.
Additional water
B.
Ephemeral water
2
Subsurface EC <4
II.
Uplands
B.
<75% bedrock outcrop
2
Surface SAR <8, or Subsurface EC <8, or Surface EC <4
ii.
Gypsum <5% surface and <10% subsurface
b.
EC <1.5 surface or <2 subsurface
2)
slope <35% or <40% surface rock
c)
depth >55cm
(2)
Rock <30% surface and <30% subsurface
(b)
Clay <30% surface and <35% subsurface
(1)
sand >75% or texture is Loamy Sand or sandier in surface & subsurface
... 041XESG14 – Sandy Uplands
(2)
sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
National Park Service
I.
Additional water
B.
Ephemeral water
1
Subsurface EC >4 - 040XESG10 Saline Bottoms
2
Subsurface EC <4
i.
Sand >50% & clay <25% for surface and subsurface - 040XESG13 Sandy Bottoms
ii.
Sand <50% or clay >25% for surface and subsurface - 040XESG01 Bottoms
II.
Uplands
A.
Surface SAR >8
2
Elevation - 3700-4500 ft - 042BESG63 Semi-Desert Grassland Saline Hills
3
Elevation - 4500-6000 ft - 042BESG38 Madrean Woodland Saline Hills
4
Elevation - >6000 ft - 070BESG64 Temperate Forest Saline Hills
B.
Surface SAR <8
1
Gypsum >5% surface or >10% subsurface
i.
Elevation - 2500-3700 ft - 042AESG33 Gypsum Thornscrub
ii.
Elevation - 3700-4500 ft - 042BESG55 Gypsum Semi-Desert Grassland
2
Gypsum <5% surface or <10% subsurface
i.
Subsurface EC >8 or surface EC >4
b.
Elevation - 3700-4500 ft - 042BESG63 Semi-Desert Grassland Saline Hills
c.
Elevation - 4500-6000 ft - 042BESG38 Madrean Woodland Saline Hills
d.
Elevation - >6000 ft - 070BESG64 Temperate Forest Saline Hills
ii.
Subsurface EC <8 and surface EC <4
a.
EC >1.5 surface or >2 subsurface
3)
Elevation - 4500-6000 ft - 042BESG66 Madrean Woodland Saline Uplands
4)
Elevation - >6000 ft - 070BESG67 Temperate Forest Saline Uplands
b.
EC <1.5 surface and <2 subsurface
1)
Slope >35% & >40% surface rock - 038XESG19 Marean Woodland Breaks
2)
Slope <35% or <40% surface rock
a)
Depth <30cm
(1)
Elevation - 2500-3700 ft - 040XESG46 Very Shallow Thornscrub
(2)
Elevation - 3700-4500 ft - 042AESG47 Very Shallow Semi-Desert Grassland
(3)
Elevation - 4500-6000 ft - 042AESG48 Very Shallow Madrean Woodland
(4)
Elevation - >6000 ft - 070BESG49 Very Shallow Temperate Forest
b)
Depth: 30-55cm
(1)
Elevation - 2500-3700 ft - 040XESG42 Shallow Thornscrub
(2)
Elevation - 3700-4500 ft - 042AESG43 Shallow Semi-Desert Grassland
(3)
Elevation - 4500-6000 ft - 038XESG44 Shallow Madrean Woodland
(4)
Elevation - >6000 ft - 070BESG45 Shallow Temperate Forest
c)
Depth >55cm
(1)
Rock >30% surface or >30% subsurface
(a)
Elevation - 3700-4500 ft - 042AESG26 Deep Rocky Semi-Desert Grassland
(b)
Elevation - 4500-6000 ft - 042BESG27 Deep Rocky Madrean Woodland
(2)
Rock <30% surface and <30% subsurface
(a)
Clay >30% surface or >35% subsurface
(1)
Elevation - 2500-3700 ft - 040XESG21 Thornscrub Clay Uplands
(3)
Elevation - 4500-6000 ft - 038XESG23 Madrean Woodland Clay Uplands
(4)
Elevation - >6000 ft - 038XESG24 Temperate Forest Clay Uplands
(b)
Clay <30% surface and <35% subsurface
(1)
Sand >75% or texture is loamy sand or sandier in surface & subsurface
(a)
Elevation - 2500-3700 ft - 042CESG40 Thornscrub Sandy Uplands
(b)
Elevation - 3700-4500 ft - 042BESG41 Semi-Desert Grassland Sandy Uplands
(c)
Elevation - 4500-6000 ft - 042BESG68 Madrean Woodland Sandy Uplands
(2)
Sand <75% or texture is sandy loam or finer in surface & subsurface
(a)
Clay <20% or texture is sandy loam or sandier in surface
(1)
Elevation - 2500-3700 ft - 040XESG34 Thornscrub Loamy Uplands
(3)
Elevation - 4500-6000 ft - 042BESG36 Madrean Woodland Loamy Uplands
(4)
Elevation - >6000 ft - 070BESG37 Temperate Forest Loamy Uplands
(b)
Clay >20% or texture is finer than sandy loam in surface
(1)
Elevation - 2500-3700 ft - 042AESG29 Thornscrub Finer Uplands
(3)
Elevation - 4500-6000 ft - 070BESG31 Madrean Woodland Finer Uplands
(4)
Elevation - >6000 ft - 070BESG32 Temperate Forest Finer Uplands
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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