page_title: Timeline of Ordovician research
section_title: 18th century
hierarchical_section_title: Timeline of Ordovician research / 18th century
caption_attribution_description: English: Orthoceras sp., nautiloid from the middle Ordovician. Digital.
context_page_description: This timeline of Ordovician research is a chronological listing of events in the history of geology and paleontology focused on the study of earth during the span of time lasting from 485.4–443.4 million years ago and the legacies of this period in the rock and fossil records.
caption: Orthoceras.
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