One Violent Moment
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: WM7QE3
Location: Oregon, United States
Date Posted: 11/22/2009
Published By:Groundspeak Premium Member silverquill
Views: 2

Marker Name: One Violent Moment
Marker Text: If you were standing at this spot 7,700 years ago when Mt. Mazama exploded, you would have been vaporized. A 2000° F fiery avalanche of incandescent rock fragments and gases hit this site at over 200 miles per hour. After the initial blast, a river of pumice ash traveled toward the Rogue River Valley burying everything in its path.

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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Recent Visits/Logs:
Date Logged Log User Rating  
Volcanoguy visited One Violent Moment 08/28/2009 Volcanoguy visited it