From the album: Lime Creek Devonian Rockford Iowa
Floydia gigantea. Much more common than Westerna gigantea. Whorls greatly enlarges in size and tend to be more oval shaped and flattened. Strongly resembles some modern top shells. There's a few other giant gastropods but I still need to check more in the near future. I was surprised seeing this good sized well preserved specimen in the middle sitting out in the open.