Minnesota Banded Iron
Detailed Description
A banded iron formation in the Precambrian of Minnesota. Image by James St. John - Jaspilite banded iron formation (Soudan Iron-Formation, Neoarchean, ~2.69 Ga; Stuntz Bay Road outcrop, Soudan Underground State Park, Soudan, Minnesota, USA) 16, CC BY 2.0, https://commons.wikimedia.org/w/index.php?curid=41615999
Sources/Usage
Public Domain.