33 20—Collier-Badland complex, 60 to 100 percent slopes

20—Collier-Badland complex, 60 to 100 percent slopes

 Map Unit Setting

 General location: Ravines in valley ashflows

Major land resource area (MLRA): 6

Elevation: 4,000 to 6,000 feet

Average annual precipitation: 20 to 60 inches

Average annual air temperature: 41 to 44 degrees F

Frost-free period: 0 to 50 days

 Map Unit Composition

 Collier and similar soils: 50 percent

Badland: 45 percent

Minor components: 5 percent

 Characteristics of the Collier and Similar Soils

 Setting

 Landform: Ashflow

Geomorphic position: Forested side slopes of ravines in valleys

Parent material: Ash and cinders

 Properties and qualities

 Slope: 60 to 80 percent

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Somewhat excessively drained

Permeability: Rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 7.1 inches

 Interpretive groups

 Ecological site: Forestland—(006XY703OR) Pinus ponderosa/Symphoricarpos hesperius/Carex inops

 Typical profile

 Oi—0 to 1 inch; slightly decomposed plant material

A—1 inch to 5 inches; ashy sandy loam

BA—5 to 12 inches; ashy loamy sand

Bw—12 to 23 inches; paragravelly ashy loamy sand

C—23 to 62 inches; paragravelly ashy sand

 Characteristics of the Badland

 Setting

 Landform: Ashflow

Geomorphic position: Nonvegetated side slopes of ravines in valleys

Parent material: Ash and cinders

 Properties and qualities

 Slope: 60 to 100 percent

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Excessively drained

 Characteristics of the Minor Components

 Stirfry taxadjunct

 Percentage of map unit: 5 percent

Landform: Stream terrace

Geomorphic position: Springs and seeps near the base of ravines

 Major Soil Features and Properties Affecting Management

 Collier soil

 • Sandy textures

• Low soil strength

• Dustiness if vegetation is removed

• Water erosion

• Steep and unstable slopes

 Badland

 • Dustiness

• Wind erosion

• Steep and unstable slopes

• Low water-holding capacity

• Water erosion

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