ypresian stage
41Cretaceous — Period 145.5–65.5 million years ago …
42Younger Dryas — Three temperature records, the GRIP sequence (red) showing the Younger Dryas event at around 11.0 ka BP. The vertical axis shows δ18O, which is a temperature proxy showing the water molecule isotopic composition of 18O in an ice core …
43Devonian — For the Celtic language, see Southwestern Brythonic language; for the residents of the English county, see Devon. Devonian Period 416–359.2 million years ago …
44Orellan — The Orellan North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 33,900,000 to 33,300,000 years BP, a period of 0.6 million… …
45Tiffanian — The Tiffanian North American Stage on the geologic timescale is the North American faunal stage according to the North American Land Mammal Ages chronology (NALMA), typically set from 60,200,000 to 56,800,000 years BP lasting 3.4 million years[1] …
46Mississippian — For other uses, see Mississippian (disambiguation). Not to be confused with the Mississippian period describing the dominance of the Mississippian culture. System Subsystem/ Series Stage Age (Ma) Permian Cisuralian Asselian …
47Miocene — System Series Stage Age (Ma) Quaternary Pleistocene Gelasian younger Neogene Pliocene …
48Neogene — Period 23.03–2.588 million years ago …
49Middle Jurassic — System Series Stage Age (Ma) Cretaceous Lower Berriasian younger Jurassic Upper Tith …
50Lutetian — The Lutetian is a stage of the Eocene Epoch. It spans the time between 48.6 ± 0.2 Ma and 40.4 ± 0.2 Ma (million years ago).It is usually united with the Bartonian to form the Middle Eocene subepoch. Less often, the Middle Eocene is not used and… …
