Major Land Resource Area 040X

Sonoran Basin and Range

Accessed: 12/28/2024

Home / Esg catalog / MLRA 040X

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

040XESG01

Bottoms
i
Key Characteristics
1. Additional water
2. Ephemeral water
3. Subsurface EC <4
4. Sand <50% or Clay >25% for surface and subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG02

Breaks
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope >35% & >40% surface rock
Add to briefcase

Quick view
Download pdf
Provisional

040XESG03

Clay Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay >30% surface or >35% subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG04

Deep Rocky
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth >55cm
8. Rock >30% surface or >30% subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG05

Finer Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay <30% surface and <35% subsurface
10. Sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
11. Clay >20% or texture is Fine Sandy Loam or finer in surface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG06

Gypsum
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum >5% surface or >10% subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG07

Loamy Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay <30% surface and <35% subsurface
10. Sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface
11. Clay <20% or texture is Sandy Loam or sandier in surface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG08

Outcrops
i
Key Characteristics
1. Uplands
2. >75% bedrock outcrop
Add to briefcase

Quick view
Download pdf
Provisional

040XESG09

Riparian
i
Key Characteristics
1. Additional water
2. Perennial water
Add to briefcase

Quick view
Download pdf
Provisional

040XESG10

Saline Bottoms
i
Key Characteristics
1. Additional water
2. Ephemeral water
3. Subsurface EC >4
Add to briefcase

Quick view
Download pdf
Provisional

040XESG11

Saline Hills
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR >8, or Subsurface EC >8, or Surface EC >4
Add to briefcase

Quick view
Download pdf
Provisional

040XESG12

Saline Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC >1.5 surface or >2 subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG13

Sandy Bottoms
i
Key Characteristics
1. Additional water
2. Ephemeral water
3. Subsurface EC <4
4. Sand >50% & Clay <25% for surface and subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG14

Sandy Uplands
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth >55cm
8. Rock <30% surface and <30% subsurface
9. Clay <30% surface and <35% subsurface
10. Sand >75% or texture is Loamy Sand or sandier in surface & subsurface
Add to briefcase

Quick view
Download pdf
Provisional

040XESG15

Shallow
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth: 30-55cm
Add to briefcase

Quick view
Download pdf
Provisional

040XESG16

Very Shallow
i
Key Characteristics
1. Uplands
2. <75% bedrock outcrop
3. Surface SAR <8, or Subsurface EC <8, or Surface EC <4
4. Gypsum <5% surface and <10% subsurface
5. EC <1.5 surface and <2 subsurface
6. Slope <35% or <40% surface rock
7. Depth <30cm
Add to briefcase

Quick view
Download pdf

Ecological site group keys

MLRA 40

I. Additional water

A. Perennial water ... 040XESG09 – Riparian

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. >75% bedrock outcrop ... 040XESG08 – Outcrops

B. <75% bedrock outcrop

1 Surface SAR >8, or Subsurface EC >8, or Surface EC >4 ... 040XESG11 – Saline Hills

2 Surface SAR <8, or Subsurface EC <8, or Surface EC <4

i. Gypsum >5% surface or >10% subsurface ... 040XESG06 – Gypsum

ii. Gypsum <5% surface and <10% subsurface

a. EC >1.5 surface or >2 subsurface ... 040XESG12 – Saline Uplands

b. EC <1.5 surface and <2 subsurface

1) Slope >35% & >40% surface rock ... 040XESG02 – Breaks

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

a) Depth <30cm ... 040XESG16 – Very Shallow

b) Depth: 30-55cm ... 040XESG15 – Shallow

c) Depth >55cm

(1) Rock >30% surface or >30% subsurface ... 040XESG04 – Deep Rocky

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

(a) Clay >30% surface or >35% subsurface ... 040XESG03 – Clay Uplands

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

(1) Sand >75% or texture is Loamy Sand or sandier in surface & subsurface ... 040XESG14 – Sandy Uplands

(2) Sand <75% or texture is Loamy Fine Sand or finer in surface & subsurface

(a) Clay <20% or texture is Sandy Loam or sandier in surface ... 040XESG07 – Loamy Uplands

(b) Clay >20% or texture is Fine Sandy Loam or finer in surface ... 040XESG05 – Finer 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