Castle on the Cliff - Crater Lake, OR
Posted by: Groundspeak Premium Member saopaulo1
N 42° 54.695 W 122° 08.572
10T E 569964 N 4751352
One of a few signs at Sinnott Memorial Overlook in Crater Lake National Park. Many of the plaque here deal with the lake's geological history.
Waymark Code: WMYXB5
Location: Oregon, United States
Date Posted: 08/05/2018
Published By:Groundspeak Premium Member Volcanoguy
Views: 2

"Not all the caldera features are from flows of lava. The 200 foot high pumice castle is an example of the complex, explosive history of Mount Mazama. It is the result of gas rich volcanic eruption that took place here about 70,000 years ago.

Tuff Times.

A glowing avalacnhe deposited numerous layers of hot pumice. As the other layers accumluated the lower sections, compressed into a hard volcanic rock. Welded tuff is the product of this intense heat and compression."
Historic Topic: Geological

Group Responsible for placement: National Parks Service

Marker Type: Trail

Region: Southern Oregon

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:
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OregonTrailRanger visited Castle on the Cliff - Crater Lake, OR 11/27/2020 OregonTrailRanger visited it