page_title: Eutrephoceras
hierarchical_section_title: Eutrephoceras
caption_attribution_description: English: Eutrephoceras dekayi from the Ripley Formation on Coon Creek, Tennessee
context_page_description: Eutrephoceras is an extinct genus of nautilus from the Late Jurassic to the Miocene. They are characterized by a highly rounded involute shell with slightly sinuous suture patterns.
context_section_description: Eutrephoceras is an extinct genus of nautilus from the Late Jurassic to the Miocene (around 161 to 5 million years ago). They are characterized by a highly rounded involute shell with slightly sinuous suture patterns.
caption: Eutrephoceras dekayi from the Coon Creek Formation
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