The Geologic Time Periods Naming System
In the early 1800’s a system for naming geologic time periods was devised using four periods of geologic time. They were named using Latin root words, Primary, Secondary, Tertiary and Quaternary. We no longer use this system of dividing geologic time.
Since that time the system for naming the periods has been constantly changing. As more information is collected, analyzed, and debated, the divisions created for looking at geologic time changes.
Below is a list of the currently accepted geologic periods. Each period name is a link to a web page with details about the geology, climate, plants and animals of that time.
| Cretaceous |