Twin Sisters Mountain

Infobox Mountain
Name = Twin Sisters Mountain
Photo = Twin Sisters Mountain 3433.jpg
Caption = As seen from southern flank of Mount Baker
Elevation = convert|7020|ft|m|0|lk=on [http://www.peakbagger.com/peak.aspx?pid=1620 South Twin] , Peakbagger.com]
Location = Washington, USA
Range = Cascade Range
Prominence = convert|3520|ft|m|abbr=on
Coordinates = coord|48|42|16|N|121|59|15|W|display=inline,title|type:mountain_region:USGnis|1526324]
Topographic
USGS Twin Sisters Mountain 48121-F8
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First ascent =
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Twin Sisters Mountain, commonly called the Twin Sisters, is a mountain in the U.S. state of Washington. Part of the Cascade Range, it lies just southwest of Mount Baker. Of its two main peaks, South Twin is higher, at convert|6940|ft|m|0|lk=on (its elevation is given by Peakbagger.com as "between 7000 and 7040 feet (40-foot closed contour)"). North Twin is convert|6660|ft|m|0 high (its elevation is given by Peakbagger.com as "between 6640 and 6680 feet (40-foot closed contour)"). [http://www.peakbagger.com/peak.aspx?pid=1619 North Twin] , Peakbagger.com] There are several glaciers on the northeast slopes of Twin Sisters Mountain.

ummits

Both of the summits are located within Mount Baker Wilderness. Twin Sisters Mountain as a whole is located southwest of Mount Baker, separated from the volcano by the Middle Fork of the Nooksack River. The South Fork Nooksack River flows around the southern end of Twin Sisters Mountain. Other streams that drain Twin Sisters Mountain include Skookum Creek, Sister Creek, Green Creek, and Howard Creek. All the streams eventually end up in the Nooksack River. [cite book | title = Washington Road & Recreation Atlas | year = 2000 | publisher = Benchmark Maps]

Geology

Twin Sisters Mountain is composed of Twin Sisters dunitecite web|url=http://geomaps.wr.usgs.gov/pacnw/nc/baker2.html|title=Generalized Geological Map of the Mount Baker 1:100,000 Quadrangle|work=North Cascades geological map|publisher=USGS|accessdate=2007-07-16] , an ultramafic rock that is mostly olivine. This dunite is part of the so-called Bell Pass Mélange: the rock originated deep in the mantle, and then was smashed up against the North American plate in a complex process when island arcs and ocean floor were accreted because of a subduction zone.cite web|url=http://www2.nature.nps.gov/geology/usgsnps/noca/twestdom.html|title=Rocks of the Western Domain|work=USGS Geology in the Parks|publisher=USGS|accessdate=2007-07-16]

References

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