Invertebrate fossil, GSA Mesozoic number 1708, from the GSA Mesozoic invertebrate paleontology collection. This specimen box contains 3 specimen(s) of the Ammonite Nautilus dekayi from the Cretaceous YP Group Formation in Undetermined County, MT, USA.
Summary
Invertebrate fossil, GSA Mesozoic number 1708, from the GSA Mesozoic invertebrate paleontology collection. This specimen box contains 3 specimen(s) of the Ammonite Nautilus dekayi from the Cretaceous YP Group Formation in Undetermined County, MT, USA.