Major Land Resource Area 036X

Southwestern Plateaus, Mesas, and Foothills

Accessed: 11/21/2024

Home / Esg catalog / MLRA 036X

Key publications

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

Next steps

1

Select an ecological site group

Select an ecological site group using the list, keys, photos, briefcase, or quick search option located on this page.
2

Explore the ecological site group description

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.

Ecological site group list

Provisional

036XESG08

Outcrops
i
Key Characteristics
1. >75% bedrock outcrop
Add to briefcase

Quick view
Download pdf
Provisional

036XESG09

Riparian
i
Key Characteristics
1. <75% bedrock outcrop
2. Perennial water
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf
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
Add to briefcase

Quick view
Download pdf

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

Download all keys

Ecological site group photos

Print Options

Sections

General information
Keys

Font

Arial
Times New Roman

Other

Two-column format

Briefcase
Add ecological site groups 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.

Search