Rocks & Minerals

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The region of the Superior National Forest has a fascinating geology.  Some of the oldest rock on the surface of the earth is exposed here.  Granites of the Laurentian shield form parts of the middle of the Forest, basalts and rhyolites laid down 1.1 billion years ago form the Sawtooth Mountains and shore of Lake Superior.  Add in 2 billion year old iron ore, fossil cyanobacteria mounds called stromatolites, and breccias formed from a cataclysmic meteor strike in Sudbury Ontario, and you have a great place to go rock hunting.

Several trails listed below visit key geologic features.  We do ask that people do not break rocks or deface rock walls.  Please practice Leave No Trace geology.



https://www.fs.usda.gov/activity/superior/recreation/rocks-minerals