Hoploscaphites, Discoscaphites, Placenticeras Upper Cretaceous Fox Hills Formation, South Dakota This natural group of ammonites, in a matrix nodule, represents the vast variety of species – and the superb quality of the specimens - comprising the famous Fox Hills Formation of Western South Dakota. Cluster measures 9 ½ x 8 x 9in, Ammonites measure between 1 ½-3 ¼in
Hoploscaphites, Discoscaphites, Placenticeras Upper Cretaceous Fox Hills Formation, South Dakota This natural group of ammonites, in a matrix nodule, represents the vast variety of species – and the superb quality of the specimens - comprising the famous Fox Hills Formation of Western South Dakota. Cluster measures 9 ½ x 8 x 9in, Ammonites measure between 1 ½-3 ¼in
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