Aeronian
Period
In the geologic timescale, the Aeronian is an age of the Llandovery Epoch of the Silurian Period of the Paleozoic Era of the Phanerozoic Eon that began 440.8 ± 1.2 Ma and ended 438.5 ± 1.1 Ma. The Aeronian Age succeeds the Rhuddanian Age and... Wikipedia
Occurred: 440.8 (+/- 1.2) million years ago - 438.5 (+/- 1.1) million years ago
Epoch: Llandovery
Lower boundary definition: FAD of the graptolite Demirastrites triangulatus
Lower boundary GSSP: Hlásná Třebaň section, Czech Republic
Regional usage: Global (ICS)