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Three Sisters


Three Sisters
Photo Information
Copyright: Chuck Kuhn (ckuh55) Silver Star Critiquer/Silver Workshop Editor/Silver Note Writer [C: 40 W: 13 N: 26] (628)
Genre: Landscapes
Medium: Color
Date Taken: 2004-01-11
Categories: Mountain
Exposure: f/9.5, 1/500 seconds
More Photo Info: [view]
Photo Version: Original Version
Date Submitted: 2005-07-07 0:40
Viewed: 3627
Points: 0
[Note Guidelines] Photographer's Note
located in Sisters, Oregon
The Three Sisters area contains 5 large cones of Quaternary age-- North Sister, Middle Sister, South Sister, Broken Top, and Mount Bachelor. North Sister and Broken Top are deeply dissected and probably have been inactive for at least 100,000 years. Middle Sister is younger than North Sister, and was active in late Pleistocene but not postglacial time. South Sister is the least dissected; its basaltic andesite summit cone has a well preserved crater. Most of South Sister predates late Wisconsin glaciation and is therefore older than 25,000 years; however, eruptions of rhyolite from flank vents have occurred as recently as 2000 years ago


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