Glacial Valleys
Posted by: Groundspeak Premium Member Volcanoguy
N 42° 57.800 W 122° 09.298
10T E 568918 N 4757089
Geologic history sign at Glacial Valleys Viewpoint on West Rim Drive.
Waymark Code: WM7M4B
Location: Oregon, United States
Date Posted: 11/07/2009
Published By:Groundspeak Regular Member silverquill
Views: 7

Marker Name: Glacial Valleys
Marker Text: The collapsed volcano that now holds Crater Lake once stood more than a mile (1.6 km) above the present lake level. Called Mt. Mazama, this massive mountain of overlapping cones was high enough to support a cap of snow all year. During the Ice Age, snow often blanketed the entire mountain - more snow than the summer sun could melt. The accumulated snow compacted to form glaciers, sluggish rivers of ice that carved out broad valleys as they inched down the slopes.
Eventually, the ice in the valleys melted. When the top of Mt. Mazama caved in about 7,700 years ago, the upper portions of the valleys collapsed with it. Today, you can see the remains of two “U”-shaped glacial valleys on the caldera wall across the lake, Kerr Notch (left) and Sun Notch (right).

Historic Topic: Geological

Group Responsible for placement: National Parks Service

Marker Type: Roadside

Region: Willamette Valley

County: Klamath

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

Web link to additional information: Not listed

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Recent Visits/Logs:
Date Logged Log User Rating  
OregonTrailRanger visited Glacial Valleys 11/27/2020 OregonTrailRanger visited it
Volcanoguy visited Glacial Valleys 08/25/2009 Volcanoguy visited it

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