San Diego Natural History Museum
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Geologic Timeline: The last 144 million years of Earth's 4.6 billion year history.

The Exhibition
Educational Resources
Activities Online
Fossil Field Guide
Visit Us


At the Museum

Refresh your knowledge of fossils, discover new information, meet experts in the field through classes, lectures, and films offered by the San Diego Natural History Museum.


Educational Resources

Teacher's Guides

Fossil MysteriesEnglish / Spanish (PDF*)
After the Dinosaurs: When Crocodiles Ruled
The Dinosaurs of Jurassic Park: The Lost World
Feathered Dinosaurs and the Origin of FlightEnglish / Spanish (PDF*)
T. REX on Trial


On This Website

Geologic Timeline
Geologic Timeline (printable)
Fossil Field Guide
Fossil Field Guide Glossary

Dinosaur Dig
Finding Fossils
Recommended Reading

Paleo News and Fossil Finds
Paleontology FAQs
The Science of "Jurassic Park" FAQs

Geologic History of San Diego County
Geologic History in our Backyard
Geology of San Diego County
Faults and Earthquakes in San Diego County

Other Resources

Ice Age Bay Area Video from KQED, San Francisco
The Paleontology Portal
DigiMorph: Bradypus variegatus, Three-toed Sloth
Evolution and the Fossil Record
Fossilization and Adaptation: Activities in Paleontology
Darwin
Earthguide
Smithsonian's Geologic Time Line

Past Exhibitions

After the Dinosaurs: When Crocodiles Ruled
The Dinosaurs of Jurassic Park: The Lost World
Feathered Dinosaurs and the Origin of Flight
Fossil Hunters San Diego
T-REX on Trial

*If unable to open the PDF documents, please download Adobe Acrobat Reader.

Pleistocene Epoch 1.8 million-10,000 years ago.
Pliocene Epoch 5-1.8 million years ago.
Miocene Epoch 24-5 million years ago.
Oligocene Epoch 34-24 million years ago.
Eocene Epoch 53-34 million years ago.
Paleocene Epoch 65-55 million years ago.
Cretaceous/Tertiary Boundary Rock, 65 million years ago.
Cretaceous Period 144-65 million years ago.
Earth's history began 4.6 billion years ago.
MYA = million years ago.