We will provide a list of web sites with relevant information. The geologic time scale is divided into eons, eras, periods, epochs, and ages. Our activities, and the time scale for download above, ...

The geological time scale, established by scientists in the ... The scale functions as a massive calendar, dividing the history of life into eras, periods, and epochs based on fossil evidence.

In 1913, before he even earned his doctoral degree, he proposed the first geological time scale, based on the fairly ... His initial estimates of Earth's eras have held up remarkably well over ...