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
