58 45—Redcone-Cinder land complex, 30 to 60 percent south slopes

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

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