Evidence for Evolution – The Fossil Record

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Magnetostratigraphy• Earth’s magnetic fieldreverses irregularlyon ~10 5 year periods• Newly formed iron inrock retains memoryof direction• Can therefore tellrelative ages• Was key evidence forplate tectonicshttp://www.nature.com/nature/journal/v452/n7184/images/452165a-f1.2.jpg 26
Radioactive DatingCan tell age ofrock from theisotopes in it.Again, consistentthrough worldfor given layer.Fossil age is ageof rockhttp://www.agiweb.org/news/evolution/figures/dating1.jpg27
Page 1 and 2: Evidence for Evolution - The Fossil
Page 3 and 4: The Basic Story• Fossils are a re
Page 5 and 6: 2. Rapid Sedimentation• Rapid cov
Page 7 and 8: 4. Uplift• Great, but fossil nowb
Page 9 and 10: Good Spots for Fossilization• Mon
Page 11 and 12: Step 1: Stasis• In hypothetical c
Page 13 and 14: Step 3: Strong Selection• The new
Page 15 and 16: Step 4: Reintroduction• When the
Page 17 and 18: Step 6: Preservation• Population
Page 19 and 20: Takeaway Message:Conditions for fos
Page 21 and 22: Rock Strata: Real21
Page 23 and 24: Relative Dating of Strata• “Law
Page 28 and 29: Takeaway Points• As always, when
Page 30 and 31: First Impressions...• Bacterial l
Page 32 and 33: The Cambrian Explosion• About 550
Page 34 and 35: CarlSagan:CosmicCalendar34
Page 36 and 37: Arguments based on the fossil recor
Page 39 and 40: Reconstructions of representative E
Page 41 and 42: Skulls, in Chronological OrderNote:
Page 43 and 44: Out of Africahttp://discovermagazin
Page 45: Summary• Fossil record, though in

Evidence for Evolution – The Fossil Record

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