When the “Dust” Settled...
Posted by: Groundspeak Premium Member Volcanoguy
N 43° 05.447 W 122° 13.292
10T E 563358 N 4771190
One of two geologic history sign at the Crater Rim Viewpoint on Ore. Hwy. 230.
Waymark Code: WM7QED
Location: Oregon, United States
Date Posted: 11/22/2009
Published By:Groundspeak Premium Member silverquill
Views: 2

Marker Name: When the “Dust” Settled...
Marker Text: The fallout from Mount Mazam’s eruption created some of the world’s deepest deposits of pumice soil. Airfall deposits east of Diamond Lake are more than 70 feet deep. Ash-flow rivers of pumice in the Rogue River Valley are up to 300 feet deep. The pumice soil beneath your feet here at Crater Rim Viewpoint is estimated to be 100 feet deep.
From Pumice To Pine
The lodgepole pine (Pinus contorta) forests found in south central Oregon are a result of the deep pumice layers deposited by Mount Mazama. These forests flourish on volcanic ash and pumice soils that are well drained, course-textured, and receive low summer rainfall during a short growing season.

Historic Topic: Geological

Group Responsible for placement: Forest Service

Marker Type: Roadside

Region: Willamette Valley

County: Douglas

State of Oregon Historical Marker "Beaver Board": Not listed

Web link to additional information: Not listed

Visit Instructions:

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Volcanoguy visited When the “Dust” Settled... 08/28/2009 Volcanoguy visited it