General Soil Map Units
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Soils That Are on Uplands and Formed in Airfall-Deposited Ash and Pumice Over Glacial Deposits
Number of map units: 2
Percentage of park: 10 percent
8. Lapine-Oatman
Percentage of park: 4 percent
Location in park: Southeastern corner 20 Soil Survey of
Slope range: 5 to 60 percent
Elevation: 4,300 to 6,000 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: 5 percent Collier soils
Present vegetation: White fir and ponderosa pine
Lapine soils
Depth class: Very deep
Drainage class: Excessively drained
Permeability: Very rapid
Position on landscape: Pumice- and ash-mantled lava plains and hills
Parent material: Pumice and ash
Surface texture: Paragravelly ashy loamy sand
Subsoil texture: Paragravelly ashy loamy sand and very paragravelly ashy sand
Substratum texture: Extremely paragravelly ashy sand
Oatman soils
Depth class: Deep to a duripan
Drainage class: Well drained
Permeability: Moderate
Position on landscape: Glaciated volcanic uplands
Parent material: Glacial deposits derived from andesite and mantled with ash
Surface texture: Gravelly medial sandy loam
Subsoil texture: Very gravelly medial sandy loam over extremely gravelly medial fine sandy loam
