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Rock on! Discovery of white quartz a happy surprise


November 16, 2018

A huge vein of white quartz looks like splattered paint at the base of the Thomson Bridge over the St. Louis River.

Last time we were together, we explored the formation of the unique bedrock of downtown Thomson. We traveled in the time machine of science and saw 2-billion-year-old mud compressed into shale, then cooked and deformed about 1 billion years ago, turning into slate. Now it is exposed in the St. Louis River in Jay Cooke Park and lines the community of Thomson.

After that journey through time, I hopped into my Dodge Dakota, left Thomson, and traveled less than a quarter of a mile before I got distracted again, this happens often to me.

As I was driving over the St. Louis River on Highway 210...

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