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Fossil Mysteries

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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.

National Science Foundations Logo 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.

  • Geologic Timeline


  • Earth's history began 4.6 billion years ago.

    MYA=million years ago