Image: Outcropping banded iron formation - panoramio

Description: outcropping banded iron formation Banded iron formation at the Soudan iron mine, now a Minnesota State Park. These beds were deposited in Precambrian seas, crumpled by tectonic forces during Precambrian times, and planed by glacial ice that retreated from the area about 10,000 years ago.
Title: Outcropping banded iron formation - panoramio
Credit: https://web.archive.org/web/20161013215241/http://www.panoramio.com/photo/25523641
Author: Raymond M. Coveney, …
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License: CC BY-SA 3.0
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