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The Evolutionary Journey from Anchorage to Homer: A Brief Earth History

Discover the 4.6 billion-year history of Earth through 226 miles from Anchorage to Homer, showcasing key milestones like the emergence of prokaryotic and eukaryotic cells, the Cambrian explosion, and the evolution of mammals and early humans.

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The Evolutionary Journey from Anchorage to Homer: A Brief Earth History

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  1. Anchorage to Homer(or a brief history of the Earth) 226 Miles 4.6 Billion years

  2. Mile 54 – 3.5 billion years ago (Between girdwood and portage) • First prokaryotic cells

  3. Mile 128 – 2 billion years ago (Seward-Homer split) • Eukaryotic cells • Free oxygen in the atmosphere Seward Homer

  4. Mile 176 – 1 billion years ago (Kasilof) • Multi-cellular organisms

  5. Mile 196 – 600 million years ago (Ninilchik) • First animals

  6. Mile 202 – 500 million years ago • Diversification of animals (Cambrian explosion) • First land plants

  7. Mile 207 – 400 million years ago (Happy Valley) • First insects • First amphibians

  8. Mile 214 – 250 million years ago Anchor Point • Dinosaurs! • First mammals

  9. Mile 223 – 65 million years ago (Just outside of Homer) • End of the dinosaurs • Earliest primates

  10. Mile 225 – 20 million years ago • Diversification and spread of primates

  11. 500 yds to go! – 6 million years ago • Earliest hominids

  12. Sometime around 5-7 million years ago… Orrorin tugenensis (Kenya) Laetoli, Tanzania

  13. 500 ft! – 2 million years ago • Beginnings of our genus Homo • Earliest stone tools

  14. ~ 2.5 - 2 MA…appearance of our genus, Homo (Africa) ER – 3733 (Kenya) Oldowan Stone Tools ER – 1470 (Kenya) “Turkana Boy” – WT 15000

  15. 50 feet from end of Homer Spit – 200,000 years ago • Earliest anatomically modern humans

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