1 / 17

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
Download Presentation

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

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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

More Related