Pumice Castle
Posted by: Groundspeak Premium Member Volcanoguy
N 42° 55.649 W 122° 03.349
10T E 577049 N 4753194
Geologic history sign about the Pumice Castle.
Waymark Code: WM7MW5
Location: Oregon, United States
Date Posted: 11/10/2009
Published By:Groundspeak Premium Member TheBeanTeam
Views: 9

Marker Name: Pumice Castle
Marker Text: Mount Mazama, the great volcano that preceded Crater Lake, was built up by successive eruptions of lava over many thousands of years. Some lavas oozed or poured from the volcano’s top or sides. Some erupted as red-hot rocks that flooded down the slopes. Others exploded into the air and fell as cinders or globs.
You can see the variety of Mt. Mazama’s lavas on the steep caldera wall. Pumice Castle, with its pinkish-brown ‘turrets,’ is the most eye-catching feature. It’s made of layers of pumice and other rocks coughed up by Mt. Mazama - some so hot they welded together. These air fall deposits were buried and compacted by other lavas, then exposed when Mt. Mazama collapsed. A firm foundation of andesite lava has kept Pumice Castle intact, while surrounding pumice deposits have eroded away.

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

Visit Instructions:

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Recent Visits/Logs:
Date Logged Log User Rating  
lwestbroetje visited Pumice Castle 07/27/2021 lwestbroetje visited it
gmarkusic visited Pumice Castle 06/16/2018 gmarkusic visited it
ChapterhouseInc visited Pumice Castle 07/13/2013 ChapterhouseInc visited it
Volcanoguy visited Pumice Castle 08/26/2009 Volcanoguy visited it
Queens Blessing visited Pumice Castle 08/08/2007 Queens Blessing visited it

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