Geologic Time Periods
Windows to the Past

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.

Era
Period
Neogene

Quaternary

Paleogene

Tertiary
Cretaceous

Jurassic

Triassic



Geologic Time

Geologic Time Line

Geologic Time Periods

Clock of Eras

Cenozoic Era

Mesozoic Era

Paleozoic Era

Proterozoic Era

Archaean Time

Hadean Time



Teachers Resources
Activities for Education and Fun


Earth Science Lesson Plans

Activities For Kids

Fossil Lesson Plans

Fossil Activities

Education Articles

Coloring Pages

Montessori Materials

Geology Club

Fossil Hunting