Geologic Time Line

The purpose of this geologic time line is to help you easily find in-depth information on eons, eras, and periods of earth’s history. We think it is convenient and useful to see the time periods all laid out in chart form. As a reference tool, you can easily note the sequence of the various divisions and the length of each unit of time. Just like the layers of the earth, the top divisions of the chart represent the most recent time. Moving down the chart, you go further and further back in time.

The names of each Eon, Era or Period are linked to pages that contain information on the geology, biology, and climate of that particular time. Note: At present, information about individual epochs can be found within their respective periods. Below the chart, you will find links to lesson plans and activities for kids related to the geologic time line.
Eon
Era
Period
Epoch
Old Periods

Phanerozoic
Eon

543 mya to Present

Cenozoic Era
65 mya to Present
Holocene

Quaternary

1.8 mya to Present

Pleistocene
Pliocene

Tertiary

65 to 1.8 mya

Miocene
Oligocene
Eocene
Paleocene
Mesozoic Era
248 mya to 65 mya
Cretaceous 144 mya to 65 mya
Jurassic 206 to 144 mya
Triassic 248 to 206 mya
Paleozoic Era
543 to 248 mya
Permian 290 to 248 mya
Carboniferous 354 to 290 mya
Devonian 417 to 354 mya
Silurian 443 to 417 mya
Ordovician 490 to 443 mya
Cambrian 543 to 490 mya
Precambrian Time
4,500 to 543 mya
Proterozoic Era 2,500 to 543 mya
Archaean 3,800 to 2,500 mya
Hadean 4,500 to 3,800 mya


Geologic Time Line related lesson plans, kid’s activities, and elementary level reading booklets.

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