Major Land Resource Area 036X

Southwestern Plateaus, Mesas, and Foothills

Accessed: 12/30/2024

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Land Resource Regions and Major Land Resource Areas of the United States, the Caribbean, and the Pacific Basin

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Ecological site group list

Provisional

036XESG08

Outcrops
i
Key Characteristics
1. >75% bedrock outcrop
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Provisional

036XESG09

Riparian
i
Key Characteristics
1. <75% bedrock outcrop
2. Perennial water
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Provisional

036XESG16(17919)

Arid Cool Breaks
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope >35% & >40% surface rock
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Provisional

036XESG17

Arid Cool Clay Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock <30% surface and <30% subsurface
13. Clay >30% surface or >35% subsurface
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Provisional

036XESG18

Arid Cool Deep Rocky
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock >30% surface or >30% subsurface
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Provisional

036XESG19

Arid Cool Finer Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock <30% surface and <30% subsurface
13. Clay <30% surface and <35% subsurface
14. Sand <75% or texture is sandy loam or finer in surface & subsurface
15. Clay >20% or texture is finer than sandy loam in surface
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Provisional

036XESG20

Arid Cool Gypsum
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum >5% surface or >10% subsurface
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Provisional

036XESG21

Arid Cool Loamy Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock <30% surface and <30% subsurface
13. Clay <30% surface and <35% subsurface
14. Sand <75% or texture is sandy loam or finer in surface & subsurface
15. Clay <20% or texture is sandy loam or sandier in surface
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Provisional

036XESG22

Arid Cool Saline Hills
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR >8
7. <75% bedrock outcrop
8. Ephemeral water or uplands
9. Aridic moisture regime
10. Cryic, frigid, or mesic temperature regimes
11. Uplands
12. Surface SAR <8
13. Gypsum <5% surface and <10% subsurface
14. Subsurface EC >8 or surface EC >4
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Provisional

036XESG23

Arid Cool Saline Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC >1.5 surface or >2 subsurface
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Provisional

036XESG24

Arid Cool Sandy Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Additional water
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Provisional

036XESG25

Arid Cool Sandy Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock <30% surface and <30% subsurface
13. Clay <30% surface and <35% subsurface
14. Sand >75% or texture is loamy sand or sandier in surface & subsurface
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Provisional

036XESG26

Arid Cool Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth: 30-55cm
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Provisional

036XESG27

Arid Cool Very Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% surface and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth <30cm
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Provisional

036XESG28

Arid Warm Saline Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Aridic moisture regime
4. Thermic temperature regime
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Provisional

036XESG29

Semiarid Cool Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Additional water
6. Sand <50% or clay >25% for surface and subsurface
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Provisional

036XESG30

Semiarid Cool Breaks
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope >35% & >40% surface rock
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Provisional

036XESG31

Semiarid Cool Clay Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock <30% surface and <30% subsurface
13. Clay >30% surface or >35% subsurface
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Provisional

036XESG32

Semiarid Cool Deep Rocky
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth >55cm
12. Rock >30% surface or >30% subsurface
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Provisional

036XESG33

Semiarid Cool Gypsum
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum >5% surface or >10% subsurface
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Provisional

036XESG34

Semiarid Cool Saline Hills
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR >8
7. <75% bedrock outcrop
8. Ephemeral water or uplands
9. Ustic or udic moisture regimes
10. Cryic, frigid, or mesic temperature regimes
11. Uplands
12. Surface SAR <8
13. Gypsum <5% and <10% subsurface
14. Subsurface EC >8 or surface EC >4
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Provisional

036XESG35

Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC >1.5 surface or >2 subsurface
10. <75% bedrock outcrop
11. Ephemeral water or uplands
12. Ustic or udic moisture regimes
13. Cryic, frigid, or mesic temperature regimes
14. Uplands
15. Surface SAR <8
16. Gypsum <5% and <10% subsurface
17. Subsurface EC <8 and surface EC <4
18. EC <1.5 surface and <2 subsurface
19. Slope <35% or <40% surface rock
20. Depth >55cm
21. Rock <30% surface and <30% subsurface
22. Clay <30% surface and <35% subsurface
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Provisional

036XESG36(18013)

Semiarid Cool Sandy Bottoms
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Additional water
6. Sand >50% % clay <25% for surface and subsurface
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Provisional

036XESG37

Semiarid Cool Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth: 30-55cm
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Provisional

036XESG38

Semiarid Cool Very Shallow
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Cryic, frigid, or mesic temperature regimes
5. Uplands
6. Surface SAR <8
7. Gypsum <5% and <10% subsurface
8. Subsurface EC <8 and surface EC <4
9. EC <1.5 surface and <2 subsurface
10. Slope <35% or <40% surface rock
11. Depth <30cm
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Provisional

036XESG39

Semiarid Warm Clay Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Thermic temperature regime
5. EC <1.5 surface and <2 subsurface
6. Depth >55cm
7. Rock <30% surface and <30% subsurface
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Provisional

036XESG40

Semiarid Warm Saline Uplands
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Thermic temperature regime
5. EC >1.5 surface or >2 subsurface
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Provisional

036XESG41

Semiarid Warm Shallow and Deep Rocky
i
Key Characteristics
1. <75% bedrock outcrop
2. Ephemeral water or uplands
3. Ustic or udic moisture regimes
4. Thermic temperature regime
5. EC <1.5 surface and <2 subsurface
6. Depth <55cm
7. <75% bedrock outcrop
8. Ephemeral water or uplands
9. Ustic or udic moisture regimes
10. Thermic temperature regime
11. EC <1.5 surface and <2 subsurface
12. Depth >55cm
13. Rock >30% surface or >30% subsurface
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Ecological site group keys

MLRA 36

I. >75% bedrock outcrop ... 036XESG08 – Outcrops

II. <75% bedrock outcrop

A. Perennial water ... 036XESG09 – Riparian

B. Ephemeral water or uplands

1 Aridic moisture regime

i. Cryic, frigid, or mesic temperature regimes

a. Additional water ... 036XESG24 – Arid Cool Sandy Bottoms

b. Uplands

1) Surface SAR >8 ... 036XESG22 – Arid Cool Saline Hills

2) Surface SAR <8

a) Gypsum >5% surface or >10% subsurface ... 036XESG20 – Arid Cool Gypsum

b) Gypsum <5% surface and <10% subsurface

(1) Subsurface EC >8 or surface EC >4 ... 036XESG22 – Arid Cool Saline Hills

(2) Subsurface EC <8 and surface EC <4

(a) EC >1.5 surface or >2 subsurface ... 036XESG23 – Arid Cool Saline Uplands

(b) EC <1.5 surface and <2 subsurface

(1) Slope >35% & >40% surface rock ... 036XESG16(17919) – Arid Cool Breaks

(2) Slope <35% or <40% surface rock

(a) Depth <30cm ... 036XESG27 – Arid Cool Very Shallow

(b) Depth: 30-55cm ... 036XESG26 – Arid Cool Shallow

(1) Rock >30% surface or >30% subsurface ... 036XESG18 – Arid Cool Deep Rocky

(2) Rock <30% surface and <30% subsurface

(a) Clay >30% surface or >35% subsurface ... 036XESG17 – Arid Cool Clay Uplands

(b) Clay <30% surface and <35% subsurface

(1) Sand >75% or texture is loamy sand or sandier in surface & subsurface ... 036XESG25 – Arid Cool 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 ... 036XESG21 – Arid Cool Loamy Uplands

(b) Clay >20% or texture is finer than sandy loam in surface ... 036XESG19 – Arid Cool Finer Uplands

ii. Thermic temperature regime ... 036XESG28 – Arid Warm Saline Uplands

2 Ustic or udic moisture regimes

i. Cryic, frigid, or mesic temperature regimes

a. Additional water

1) Sand >50% % clay <25% for surface and subsurface ... 036XESG36(18013) – Semiarid Cool Sandy Bottoms

2) Sand <50% or clay >25% for surface and subsurface ... 036XESG29 – Semiarid Cool Bottoms

b. Uplands

1) Surface SAR >8 ... 036XESG34 – Semiarid Cool Saline Hills

2) Surface SAR <8

a) Gypsum >5% surface or >10% subsurface ... 036XESG33 – Semiarid Cool Gypsum

b) Gypsum <5% and <10% subsurface

(1) Subsurface EC >8 or surface EC >4 ... 036XESG34 – Semiarid Cool Saline Hills

(2) Subsurface EC <8 and surface EC <4

(a) EC >1.5 surface or >2 subsurface ... 036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands

(b) EC <1.5 surface and <2 subsurface

(1) Slope >35% & >40% surface rock ... 036XESG30 – Semiarid Cool Breaks

(2) Slope <35% or <40% surface rock

(a) Depth <30cm ... 036XESG38 – Semiarid Cool Very Shallow

(b) Depth: 30-55cm ... 036XESG37 – Semiarid Cool Shallow

(1) Rock >30% surface or >30% subsurface ... 036XESG32 – Semiarid Cool Deep Rocky

(2) Rock <30% surface and <30% subsurface

(a) Clay >30% surface or >35% subsurface ... 036XESG31 – Semiarid Cool Clay Uplands

(b) Clay <30% surface and <35% subsurface ... 036XESG35 – Semiarid Cool Saline, Sandy, Loamy, and Finer Uplands

ii. Thermic temperature regime

a. EC >1.5 surface or >2 subsurface ... 036XESG40 – Semiarid Warm Saline Uplands

b. EC <1.5 surface and <2 subsurface

1) Depth <55cm ... 036XESG41 – Semiarid Warm Shallow and Deep Rocky

2) Depth >55cm

a) Rock >30% surface or >30% subsurface ... 036XESG41 – Semiarid Warm Shallow and Deep Rocky

b) Rock <30% surface and <30% subsurface ... 036XESG39 – Semiarid Warm Clay Uplands

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