From the Depth - Crater Lake, OR
Posted by: 
saopaulo1
N 42° 54.695 W 122° 08.578
10T E 569956 N 4751353
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: WMYXB1
Location: Oregon, United States
Date Posted: 08/05/2018
Views: 2
The dark rock spine that juts from the cliff visible to the left of Wizard Island is called the Devil's Backbone. This 1300 foot long ribbon of lava, reaching from the lake to the rim, is about 50000 years old. Breaking through the older layers of rock, this vertical lava flow arose from the depth of the magma chamber that created Mount Mazama.
Exposed Plumbing?
As Mount Mazama formed, lava rose up in many places through feeder vents or dikes, which serve as the plumbing system for the volcano. When the volcano collapsed the solififed magma in the Devil's Backbone dike was exposed. As with all dikes, its rock is more resistant to eroision than the surrounding material, because it cooled more slowly within the vent underground.
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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