Proterozoic Period Read and learn about the Proterozoic Period...
https://en.wikipedia.org/wiki/Proterozoic Mesozoic Period Read and learn about the Mesozoic Period...
https://en.wikipedia.org/wiki/Mesozoic Palaeozoic Period Read and learn about the Palaeozoic Period...
https://en.wikipedia.org/wiki/Paleozoic Cenozoic Period Read and learn about the Cenozoic Period...
https://en.wikipedia.org/wiki/Cenozoic Geologic time scale The geological time scale (GTS) is a system of chronological dating that relates geological strata (stratigraphy) to time, and is used by geologists, paleontologists, and other Earth scientists to describe the timing and relationships of events that have occurred during Earth’s history.
https://en.wikipedia.org/wiki/Geologic_time_scale