Detailed Soil Map Units
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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
