45—Redcone-Cinder land complex, 30 to 60 percent south slopes
Map Unit Setting
General location: Side slopes of cinder cones
Major land resource area (MLRA): 3
Elevation: 5,500 to 7,500 feet
Average annual precipitation: 50 to 70 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 0 to 50 days
Map Unit Composition
Redcone and similar soils: 70 percent
Cinder land: 15 percent
Minor components: 15 percent
Characteristics of the Redcone and Similar Soils
Setting
Landform: Cinder cone
Geomorphic position: Side slopes of cinder cones
Parent material: Colluvial material consisting of ash and cinders
Properties and qualities
Slope: 30 to 60 percent; northeast to northwest aspects
Percentage of surface covered with stones and boulders: 3 percent
Restrictive feature: Duripan at a depth of 20 to 40 inches
Drainage class: Somewhat excessively drained
Permeability: Rapid over moderate
Flooding: Not present
Water table: Not present
Ponding: Not present
Available water capacity: About 3.9 inches
Interpretive groups
Ecological site: Forestland—(003XY702OR) Tsuga mertensiana/Arctostaphylos patula-Holodiscus discolor/Carex inops
Typical profile
Oi—0 to 1 inch; slightly decomposed plant material
A—1 inch to 7 inches; very gravelly ashy sandy loam
Bw1—7 to 24 inches; very gravelly ashy coarse sandy loam
Bw2—24 to 27 inches; very gravelly ashy loamy sand
2Bsqm—27 to 38 inches; cemented gravelly ashy loamy sand
2BC—38 to 61 inches; extremely gravelly ashy loamy sand
Characteristics of the Cinder Land
Landform: Cinder cone
Geomorphic position: Cinder deposits on side slopes of cinder cones
Parent material: Andesite
Slope: 30 to 60 percent
Characteristics of the Minor Components
Rock outcrop
Percentage of map unit: 10 percent
Landform: Cinder cone
Geomorphic position: Andesite lava flows on side slopes of cinder cones
Timbercrater soils
Percentage of map unit: 5 percent
Landform: Cinder cone
Geomorphic position: Airfall deposits of pumice and ash on side slopes of cinder cones
Major Features and Properties Affecting Management
Redcone soil
• Steep and unstable slopes
• Rock fragments on surface
• Rock fragments in soil profile
• Dustiness
• Depth to hardpan
• Low soil strength
• Water erosion
• Low water-holding capacity
Cinder land
• Steep and unstable slopes
• Rock fragments
• Dustiness
• Low strength
• Lack of soil material
• Low water-holding capacity
