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Journal Entry #4 – Earth ’ s History and Radiometric Dating

Journal Entry #4 – Earth ’ s History and Radiometric Dating. Anchorage to Homer (or a brief history of the Earth). 226 Miles 4.6 Billion years. Mile 54 – 3.5 billion years ago. (Between girdwood and portage). First prokaryotic cells. Mile 128 – 2 billion years ago. (Seward-Homer split).

herrod-gonzalez
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Journal Entry #4 – Earth ’ s History and Radiometric Dating

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  1. Journal Entry #4 – Earth’s History and Radiometric Dating

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

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

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

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

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

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

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

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

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

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

  12. 500 yds to go! – 6 million years ago • Earliest hominids

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

  14. 500 ft! – 2 million years ago • Beginnings of our genus Homo • Earliest stone tools

  15. ~ 2.5 - 2 MA…appearance of our genus, Homo (Africa) ER – 3733 (Kenya) Oldowan Stone Tools ER – 1470 (Kenya) “Turkana Boy” – WT 15000

  16. 50 feet from end of Homer Spit – 200,000 years ago • Earliest anatomically modern humans

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