Richmond age/stage
General information Lower boundary: after 449.5 Ma (based on Ashgill) Upper boundary: equal to 445.6 Ma (based on Katian) Continent: Europe See collections within this interval See map of collections within this interval Key correlations Period: Ordovician Epoch: Late/Upper Ordovician Stage: middle Late Ordovician 10 million year bin: Ordovician 5 Contained within Previous intervals Next intervals | Shares base with Overlaps with Appears in scale |