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Why this story today: It explains what visitors are actually looking at on the Pictured Rocks cliffs: mineral stain still being laid down by groundwater leaking out of the sandstone, with iron making the orange, manganese the black and limonite the white.
Lead read · 3 min
The stripes on the Pictured Rocks cliffs are mineral stain, still being laid down by groundwater leaking out of the sandstone. Iron makes the orange, manganese…
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