Minnesota Geology
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Is vugs even the right term? Could some of them be lava tubes?
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A viewpoint just south of the USA-Canada border at the northeastern tip of Minnesota.
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The late Archean (older than 2.5 billion years old) Soudan Banded Iron Formation is part of the Ely Greenstone Belt in northern Minnesota. This glacially scoured outcrop occurs in Soudan State Park, site of the oldest iron mine in Minnesota, which operated from 1884 to 1962. The banding reflects differing concentrati...
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A closer look at the Archean Soudan Banded Iron Formation in northern Minnesota. The outcroop is located at Soudan State Park, site of the oldest Iron mine Minnesota. More details and a broader view here: gigapan.org/gigapans/94833Glacial striations on this outcrop trend from the top towards the bottom of th...
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