Wikimedi'Òc

Glacial striations on limestone (rocky northern shore of Kelleys Island, Lake Erie, Ohio, USA) 3 (48541252321).jpg - Ser Amantio di Nicolao

Columbus Limestone (Middle Devonian; northern shore of Kelleys Island, Lake Erie, Ohio, USA) 4 (48637129806).jpg - Ser Amantio di Nicolao

Columbus Limestone (Middle Devonian; northern shore of Kelleys Island, Lake Erie, Ohio, USA) 6 (48637271317).jpg - Ser Amantio di Nicolao

Columbus Limestone (Middle Devonian; northern shore of Kelleys Island, Lake Erie, Ohio, USA) 8 (48637130311).jpg - Ser Amantio di Nicolao