Timeline of Ordovician research

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.

1780s
 1789 
 * Bruguière described the new genus Orthoceras

1970s
 1978 
 * Lindström, Maurits, described the earliest known octocoral in Sweden shifting the first known appearance from the Cretaceous to the Ordovician.

2010s
 2015 
 * Van Roy, Daley, and Briggs described the new genus and species Aegirocassis benmoulae.