Wikimedi'Òc

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; Rt. 169 roadcut just west of Ely, Minnesota, USA) 2 (20906414443).jpg - Ser Amantio di Nicolao

Metamorphosed pillow basalt (Ely Greenstone, Neoarchean, ~2.722 Ga; large glacial erratic along Main Street, Ely, Minnesota, USA) 9 (21428138146).jpg - Ser Amantio di Nicolao

Pyritic iron formation (Soudan Iron-Formation, Neoarchean, ~2.722 Ga; Vermilion Iron Range, Minnesota, USA) (23427270181).jpg - Ser Amantio di Nicolao