411 REFERENCE · Wiktionary
Hauterivian
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Proper noun
en geology An age in the Early Cretaceous Epoch or a stage in the Lower Cretaceous Series. It spans the time between 132.9 ± 2 Ma and 129.4 ± 1.5 Ma (million years ago).