Banded Iron Formation, stromatolite, jasper, unakite, Lake Michigans Left Coast, Elizabeth G Fagan, Roscoes Relics

Colorful Rocks of the Great Lakes 5

A combo plate of Archean Eon (4000–2500 million years ago) and Proterozoic Eon (2500–541 million years ago) stromatolites, stromatoporoids, and unakite, the latter a pink and green semiprecious stone common on Lake Michigan's Left Coast. Copyright, Disclaimer, Glossary, Bibliography