60 47—Rock outcrop-Rubble land complex, 60 to 90 percent slopes

47—Rock outcrop-Rubble land complex, 60 to 90 percent slopes

 Map Unit Setting

General location: Steep side slopes, mainly on the caldera rim

Major land resource area (MLRA): 3

Elevation: 6,000 to 8,000 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

 Rock outcrop: 50 percent

Rubble land: 45 percent

Minor components: 5 percent

Characteristics of the Rock Outcrop

 Landform: Stratovolcano

Geomorphic position: Rock outcroppings on side slopes of mountains and the caldera rim

Parent material: Andesite

 Characteristics of the Rubble Land

 Landform: Talus slope

Geomorphic position: Talus on side slopes of mountains and the caldera rim

Parent material: Colluvium derived from andesite

 Characteristics of the Minor Components

 Llaorock soils

 Percentage of map unit: 5 percent

Landform: Stratovolcano

Geomorphic position: Side slopes of mountains and the caldera rim

 Major Features and Properties Affecting Management

 Rock outcrop

 • Steep slopes

• Lack of soil material

 Rubble land

 • Steep and unstable slopes

• Rock fragments

• Lack of soil material

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