South Twin Sister - North Cascades, WA - Mountain Summits on Waymarking.com

This small mountain range is a geologic anomaly. It is really interesting to visit. The Olivine it a really unique rock when weathered. Some where near Acme, WA the dunite is mined.

From summitpost.com, "The Twin Sisters Range is an interesting sub-range outlier of the Cascade Range. The entire range is composed of rock which is actually a fragment of subcontinental mantle which has thrust up through the crust. Located just 21.5 miles (34.6km) from Bellingham Bay, the range sharply contrasts the rock and mountains that surround it. From a distance the rock may appear as any number of hues depending on the time of day and lighting but from close by it appears as a bright reddish orange. The Native Americans called the range "Kwik-Kwek Smanik" which is believed to mean "red rock" or "red mountains". The color is related to the iron content."

"The Twin Sister Range is the largest body of exposed Olivine (Magnesium Iron Silicate) in the Western Hemisphere. A fragment of the Subcontinental Mantle brought up by the Shuksan Thrust..."

The scramble itself is solid. If there was any exposure I don't remember it. There is some potential to lose you way but lots of cairns help keep you oriented even if you take periodically, variable routes.

If you go you may as well get a picture to log this benchmark too.

Altitude in Feet: 6900

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