Wikimedi'Òc

Silicified stromatolite boundstone with oolites & sinuous stromatolites (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Mary Ellen Mine, near Biwabik, Minnesota, USA) 2 (15059501145).jpg - Ser Amantio di Nicolao

Silicified stromatolite boundstone with oolites & sinuous stromatolites (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Mary Ellen Mine, near Biwabik, Minnesota, USA) 5 (40566520003).jpg - Ser Amantio di Nicolao

Silicified stromatolite boundstone with oolites & sinuous stromatolites (Biwabik Iron-Formation, Paleoproterozoic, ~1.878 Ga; near Mary Ellen Mine, near Biwabik, Minnesota, USA) 4 (47479738932).jpg - Ser Amantio di Nicolao