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FOSSIL MYSTERIESGeologic Timeline: The last 144 million years of Earth's 4.6 billion year history.

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Ponder mysteries.

Examine
fossil evidence.

Discover a world
full of change.

From dinosaurs to mastodons, travel through 75 million years and dig into the rich fossil history of southern California and Baja California.

Explore
Fossil Mysteries.




Developed by the San Diego Natural History Museum. Major funding provided by the California Cultural and Historic Endowment; National Science Foundation; Stephen and Mary Birch Foundation; an anonymous donor; and generous support from the J. W. Sefton Foundation; the San Diego Foundation: Weingart-Price Fund and Carol and Henry F. Hunte Fund; San Diego County Supervisors Pam Slater-Price, Ron Roberts and Greg Cox; The Legler Benbough Foundation; THE PARKER FOUNDATION: Gerald and Inez Grant Parker; Thomas C. Ackerman Foundation; Charmaine and Maurice Kaplan; Carol and Dennis Wilson; Rice Family Foundation; Samuel and Katherine French Fund; Ellen Browning Scripps Foundation; and Sony Electronics Inc.

This material is based upon work supported by the National Science Foundation under Grant No. 0205820. Any opinions, findings, and conclusions or recommendations expressed in this material are those of the authors and do not necessarily reflect the views of the National Science Foundation.




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.