7.6″ Polished Stromatolite (Collenia) Slab – Minnesota

7.6″ Polished Stromatolite (Collenia) Slab – Minnesota (Item #326050), Stromatolite Fossils for sale. FossilEra your source to quality fossil specimens.
Species: Collenia undosa
Age: Proterozoic ~1.9 Billion Years Ago
Location: Mary Ellen Mine, St. Louis County, Minnesota
Formation: Biwabik Iron Formation
Size: 7.6 x 5″, .2″ thick