65 52—Timbercrater paragravelly ashy loamy sand, dry, 25 to 60 percent north slopes

52—Timbercrater paragravelly ashy loamy sand, dry, 25 to 60 percent north slopes

 Map Unit Setting

 General location: Side slopes of mountains and ridges on the eastern side of the park

Major land resource area (MLRA): 3

Elevation: 5,000 to 6,500 feet

Average annual precipitation: 40 to 60 inches

Average annual air temperature: 38 to 42 degrees F

Frost-free period: 0 to 50 days

 Map Unit Composition

 Timbercrater and similar soils: 85 percent

Minor components: 15 percent

 Characteristics of the Timbercrater and Similar Soils

 Setting

 Landform: Stratovolcano

Geomorphic position: Side slopes of mountains and ridges

Parent material: Ash and pumice

 Properties and qualities

 Slope: 25 to 60 percent; northwest to northeast aspects

Percentage of surface covered with stones and boulders: None

Restrictive features: None within a depth of 60 inches

Drainage class: Excessively drained

Permeability: Very rapid

Flooding: Not present

Water table: Not present

Ponding: Not present

Available water capacity: About 8.1 inches

 Interpretive groups

 Ecological site: Forestland—(003XY704OR) Abies/Arctostaphylos nevadensis/Carex inops

 Typical profile

 Oi—0 to 2 inches; slightly decomposed plant material

A—2 to 5 inches; paragravelly ashy loamy sand

Bw—5 to 16 inches; very paragravelly ashy loamy sand

C1—16 to 20 inches; extremely paragravelly ashy sand

C2—20 to 62 inches; extremely paragravelly ashy sand

 Characteristics of the Minor Components

 Sunnotch soils

 Percentage of map unit: 5 percent

Landform: Debris flow

Geomorphic position: Debris flows on mountainsides

 Castlecrest soils

 Percentage of map unit: 5 percent

Landform: Stratovolcano

Geomorphic position: Airfall deposits of ash on mountainsides

 Llaorock soils

 Percentage of map unit: 5 percent

Landform: Stratovolcano

Geomorphic position: Ash mixed with residuum and colluvium derived from andesite on side slopes of mountains and ridges

 Major Soil Features and Properties Affecting Management

 Timbercrater soil

 • High pumice content

• Very rapid permeability

 

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