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.
18th century
1780s
1789
Bruguière described the new genus Orthoceras
20th century
1970s
1978
Lindström, Maurits, described the earliest known octocoral in Sweden shifting the first known appearance from the Cretaceous to the Ordovician.
21st century
2010s
2015
Van Roy, Daley, and Briggs described the new genus and species Aegirocassis benmoulae.