Three fingered jack
| Three-fingered jack | ||
|---|---|---|
 Three Fingered Jack from the east |
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| height | 2391 m | |
| location | Oregon ( USA ) | |
| Mountains | Cascade chain | |
| Notch height | 756 m | |
| Coordinates | 44 ° 28 '44 " N , 121 ° 50' 35" W | |
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| Type | Shield volcano | |
| Age of the rock | > 200,000 years | |
The Three Fingered Jack is a 2391 m high mountain in the US state of Oregon . It is a heavily eroded shield volcano , which with its rugged summit ridge consisting of several rock towers is a striking landmark in the area between the Three Sisters in the south and Mount Jefferson in the north in the central part of the Cascade Mountains .
location
The Three Fingered Jack rises approximately 32 km northwest of the city of Sisters in the US state of Oregon , on the border between Jefferson and Linn Counties , which is also the border between Deschutes and Willamette National Forest . The mountain is located in the south of the Mount Jefferson Wilderness , a nature reserve of the type of a Wilderness Area .
The mountain rises on the main ridge of the Cascade Range, 13 miles south of Mount Jefferson , Oregon's second highest peak. 16 km south is the Mount Washington a genesis historically the Three Fingered Jack very similar mountain while another 20 km to the south, the stratovolcanoes Three Sisters are.
Between Three Fingered Jack and Mount Washington is the Santiam Pass , an important road link between central Oregon with the city of Bend and the fertile Willamette Valley and the urban centers there such as Salem and Portland . US Highway 20 runs over the pass .
geology
The Three Fingered Jack is a shield volcano that formed in the Pleistocene around 250,000 years ago.
During the cold ages, the main ridge of the cascade was heavily glaciated, and a large part of the mountain was eroded by glacial erosion, exposing the mountain's chimney, which was made of hard effluent rock .
In the central cascades there are a number of other peaks with very similar origins and a correspondingly similar appearance, such as the southern neighbor Mount Washington or Mount Thielsen north of Crater Lake .
Web links
Individual evidence
- ^ A b Raymond R. Hatton: Oregon's Sisters Country. Geographical Books, Bend, 1996. ISBN 0-89288-260-3
- ↑ NGS data sheet Three Fingered Jack
- ↑ http://www.peakbagger.com/peak.aspx?pid=2406