33—Lava flows, 0 to 15 percent slopes
Map Unit Setting
General location: Lower slopes of Wizard Island
Major land resource area (MLRA): 3
Elevation: 6,100 to 6,300 feet
Average annual precipitation: 60 to 80 inches
Average annual air temperature: 37 to 43 degrees F
Frost-free period: 0 to 30 days
Map Unit Composition
Lava flows: 95 percent
Minor components: 5 percent
Characteristics of the Lava Flows
Landform: Lava flow
Geomorphic position: Andesitic basalt and andesite lava flows on Wizard Island
Parent material: Andesitic basalt
Characteristics of the Minor Components
Sunnotch soils
Percentage of map unit: 5 percent
Landform: Debris flow
Geomorphic position: Residuum derived from andesitic basalt and andesite on Wizard Island
Major Features and Properties Affecting Management
Lava flows
• Rock fragments
• Lack of soil material
