General Soil Map Units
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Soils That Are on Uplands and Formed in Airfall-Deposited Ash and Pumice
Number of map units: 3
Percentage of park: 29 percent
1. Lapine-Steiger (ponderosa pine/fir)
Percentage of park: 7 percent
Location in park: Eastern side, primarily on the eastern flank of Timber Crater
Depth class: Very deep
Position on landscape: Pumice- and ash-mantled lava plains, hills, ridges, and cinder cones
Parent material: Pumice and ash
Elevation: 4,200 to 6,500 feet
Average annual precipitation: 25 to 50 inches
Average annual air temperature: 38 to 42 degrees F
Frost-free period: 10 to 50 days
Minor components: 10 percent Wuksi soils and 5 percent Rock outcrop
Present vegetation: Ponderosa pine, white fir, and lodgepole pine
Lapine soils
Drainage class: Excessively drained
Permeability: Very rapid
Surface texture: Paragravelly ashy loamy sand
Subsoil texture: Very paragravelly ashy sand
Substratum texture: Extremely paragravelly ashy sand
Slope range: 2 to 70 percent
Steiger soils
Drainage class: Somewhat excessively drained
Permeability: Rapid
Surface texture: Ashy loamy coarse sand
Subsoil texture: Paragravelly ashy loamy coarse sand
Substratum texture: Paragravelly ashy coarse sand
Slope range: 2 to 25 percent
