Ordovician-Silurian Extinction- Madison and Taylor

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  • Ordovician-Silurian Extinction 455-430 MYA
  • Hey Stacy! Do you know about the Ordovician and Silurian period?
  • No I don't Johnny. What's that?
  • Ordovician-Silurian Extinction 455-430 MYA
  • It was a mass extinction that killed off most marine communites like brachiopods, bryozoans, trilobites, conodonts, and graptolites! Though after, brachiopods, pentamerids, and rhynchonellias flourished!
  • Ordovician-Silurian Extinction 455-430 MYA
  • Whoa! What caused that to happen?
  • Well you see, the fall of sea levels, rapid cooling, and glaciation all contributed to the decrease in marine life.
  • Ordovician-Silurian Extinction 450-430 MYA
  • That's crazy! Where can i find more information about this?
  • Some people today are even questioning whether a gamma ray added to the cause.
  • Ordovician-Silurian Extinction 450-530 MYA
  • The article even tells facts like how the cooling of the water coincided with the carbon cycle!
  • I know that science.sciencemag.com has a recent article on the extinction written in 2011! Its called "The Magnitude and Duration of Late Ordovician."
  • www.britannica.com www.ucmp.berkeley.edu evolutionaryradiation.weebly.com earthscience.stackexchange.com
  • Thank you!
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