Mt. Thielsen - Oregon Historical Markers on Waymarking.com

Marker Name: Mt. Thielsen - Lightning Rod of the Cascades
Marker Text: The distinctive peak of Mt. Thielsen attracts more than just attention from sightseers; this spire is also a tempting target for lightning, which has actually melted rock on the summit! The spire is the hardened core of the old volcano that built Mt. Thielsen. How did it look as a young mountain?
In the Beginning -- Thielsen formed about 300,000 years ago through a series of volcanic eruptions. The result was probably a cone-shaped peak bearing little resemblance to what we see today. What caused the change?
The Sculptors -- During the ice ages following its formation, the mountain was covered by massive sheets of ice that inched down its sides, grinding away the slopes.
A Hardened Core -- Thousands of years of grinding by ice sculpted the mountain to the general shape we see today. Because the central plug was harder than the surrounding material, it survived.

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

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Recent Visits/Logs:

Date Logged Log User Rating   08/28/2009 Volcanoguy visited it