Wikimedi'Òc

Basalt lava flows (left) & volcanic lithic sandstone (right background) (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) (21817726894).jpg - Ser Amantio di Nicolao

Basalt lava flow (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 1 (22451681251).jpg - Ser Amantio di Nicolao

Basalt lava flows (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 8 (22414773106).jpg - Ser Amantio di Nicolao

Basalt lava flows (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 7 (22253081238).jpg - Ser Amantio di Nicolao

Basalt lava flow (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 5 (22253993609).jpg - Ser Amantio di Nicolao

Basalt lava flows (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 6 (22253985789).jpg - Ser Amantio di Nicolao

Basalt lava flow (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 3 (22414818916).jpg - Ser Amantio di Nicolao

Basalt lava flow (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 4 (22440807525).jpg - Ser Amantio di Nicolao

Basalt lava flows (North Shore Volcanic Group, Mesoproterozoic, ~1.1 Ga; Leif Ericson Park, Duluth, Minnesota, USA) 2 (22427571782).jpg - Ser Amantio di Nicolao