psychoactivelectricity: Negaunee Iron Formation at Jasper Knob, near Ishpeming, Michigan by Allison Pluda. Banded iron formation of more than 2 billion years. The bands are alternating layers of gray magnetite and red iron.
psychoactivelectricity: Negaunee Iron Formation at Jasper Knob, near Ishpeming, Michigan by Allison Pluda. Banded iron formation of more than 2 billion years. The bands are alternating layers of gray magnetite and red iron.
