Saturday, 20 June 2015

Organic Evolution Timepoints

A previous post outlined the rationale behind using (predominantly) the New Scientist evolution of life website but (a) not all the TimePoints from that site are in the default TimeLine and (b) not all of the TimePoints in the TimeLine are from that site. So, how did we choose what to put in?

Because we have not yet rolled out customised TimeLines, we wanted something that would be reasonably flexible. We have therefore erred on the side of having too many points, rather than too few. (As outlined in the “How to use MapTime” post, TimePoints can be hidden.) We also wanted a reasonable spread of points, although some important events clearly cluster more than others. Finally, because it is intended as an educational tool, there is a bit of a human bias in this timeline, particularly for the more recent events.

Although MapTime is not currently under active development, we would be happy to add additional TimePoints that would be of use. There are some others on the site, in addition to the Evolving Earth TimePoints and TimeLine.

The TimePoints

The Organic Evolution TimeLine has the following TimePoints. Note that the divergence of Great Apes from gibbons (ca. 20 Mya) was added today, as there was a bit of gap following the K/T Extinction 65 Mya.

  1. 2012 AD, MapTime (Destination)
  2. 1989 AD, Cold War ends
  3. 1945 AD, Hiroshima
  4. 1776 AD, American Independence
  5. 5 kya, Writing
  6. 5.5 kya, Bronze Age
  7. 35 kya, Cave art
  8. 72 kya, Clothing/jewellery
  9. 195 kya, Homo sapiens appears
  10. 1.6 mya, Use of fire
  11. 1.8 mya, Out of Africa
  12. 2.5 mya, Stone tools
  13. 5.8 mya, Bipedal walking
  14. 6 mya, Humans diverge fromcChimps
  15. 20 mya, Great Apes diverge from gibbons
  16. 65 mya, K/T Extinction
  17. 70 mya, Grass
  18. 130 mya, Flowers
  19. 150 mya, Archaeopteryx (early birds)
  20. 180 mya, Mammals
  21. 200 mya, Warm bloodedness
  22. 250 mya, Permian Extinction
  23. 397 mya, Tetrapods
  24. 400 mya, Insects and woody plants
  25. 465 mya, Land Plants
  26. 500 mya, Arthropod crawls onto land
  27. 535 mya, Cambrian Explosion
  28. 540 mya, Chordates
  29. 630 mya, Bilateral Symmetry
  30. 900 mya, Multicellularity
  31. 2 bya, First Eukaryotic Cells
  32. 2.15 bya, Photosynthesis
  33. 2.3 bya, Snowball Earth
  34. 2.4 bya, Oxygen Atmosphere
  35. 3.5 bya, Single Celled Life
  36. 4.54 bya, Formation of Earth (Start Location)

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