sinemurian
31Ordovician — Period 488.3–443.7 million years ago …
32Oligocene — System Series Stage Age (Ma) Neogene Miocene Aquitanian younger Paleogene Oligocene …
33Pennsylvanian — This article is about the geologic subperiod. For passenger train, see Pennsylvanian (Amtrak). System Subsystem/ Series Stage Age (Ma) Permian Cisuralian Asselian younger …
34Permian — For the language family, see Permic languages. For the high school, see Permian High School. For the geological basins, see Permian Basin. Permian Period 299–251 million years ago …
35Paleozoic — era 542   251 million years ago Key events in the Paleozoic view • edit …
36Precambrian — For the album by German band The Ocean, see Precambrian (album). Precambrian Period 4567.17–542 million years ago …
37Younger 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 …
38Mesoproterozoic — era 1600   1000 million years ago Key events in the Mesoproterozoic view • edit …
39Dilophosaurus — Unikonta Dilophosaurus Temporal range: Early Jurassic, 193 Ma …
40Cryogenian — Period 850–630 million years ago …
