Updated with the latest changes to the international geologic time scale: • Numerous revisions to numerical time scale, including 58 updates to stage boundaries, 22 updates to epoch boundaries, and 7 updates to period boundaries. • Includes the newly ratified GSSP (golden spike) at the base of the Valanginian Stage of the Cretaceous.

Updated for iOS 17 Includes the most recent ages for the geologic time scale Now includes North American Devonian stages and series

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified GSSP (golden spike) at the base of the Langhian Stage of the Miocene. • Includes the new age for the Burdigalian / Langhian stage boundary • Added several informal units plus the order of North American stages and series for the Ordovician, Silurian, Mississippian, and Pennsylvanian

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified GSSP (golden spike) at the base of the Barremian Stage of the Cretaceous. • Includes the new age for the Hauterivian / Barremian stage boundary

• Added many regional stages, especially from Italy, the Pleistocene, and North America • Searchable database now includes 178 formal chronostratigraphic units and 734 informal and regional units • Bug fixes

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified GSSPs (golden spikes) at base of Campanian (Cretaceous) Stage. • Updates the ages of all Jurassic stages. • Includes newest date for base of Hadean Eon.

• Added New Zealand regional time scale • Updated for iOS 16

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified GSSP for the base of the Artinskian Stage • Includes the newest dates for base of the Aptian Stage and the Fortunian Stage (also the Cambrian, Paleozoic, and Phanerozoic)

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified subseries for the Miocene and Pliocene series (visible through the search). • Added the previously ratified subseries for the Pleistocene and Holocene series (visible through the search).

Updated with the latest changes to the international geologic time scale: • Includes the newly ratified GSSPs (golden spikes) at base of Priabonian (Eocene) and Hauterivian (Cretaceous) stages. • Adds the newest ages for the bases of the Roadian, Wordian, Capitanian, and Wuchiapingian stages (Permian). • Show the updated colors for the Pennsylvanian, Pleistocene, and Holocene.

• Added golden spikes (GSSPs) for the Coniacian and Kimmeridgian Stages, reflecting the most recent changes to the geologic time scale

• Updated date of the Bartonian/Priabonian Stage boundary • Added GSSP (golden spike) for the base of the Priabonian Stage

• Expanded the list of searchable regional and formerly used stages, as well as Cretaceous land-animal (land-mammal) ages. • Now provides references for additional resources on geological time scales.

Lots of additions to this version, making DeepTime your go-to source for geologic time • Almost 500 regional series and stages, informal units, land mammal ages, and formerly used units have been added, along with their equivalents in modern stratigraphic usage. • Added the definitions of all the GSSPs (golden spikes) • Use a long press on the time scale to copy the name of a stratigraphic unit • Other user-interface improvements