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Ordovician - Silurian Extinction

LE

Lauren Eliscu

Transcript

Ordovician - Silurian Extinction

Sea Levels

  • Glaciation

Atmosphere Temperature

Paleozoic era

  • Ordovician:Climate was high
  • High concentration levels of CO2
  • Strong Greenhouse Effect

Levels

  • Silurian
  • 443-416 M.Y.A
  • Ordovician
  • 488-444 M.Y.A
  • Silurian:Generally warm and stable
  • Not like Ordovician (Glaciers)
  • Not like Devonian (Extreme Heat)
  • Ordovician:Had about 70% as much oxygen as today's atmosphere
  • Silurian:10% more oxygen than today's atmosphere

Plants

Ocean and Seas Temperature

Gondwana was a tropical forest

Marine Water temperatures averaged 45C, over time the climate became cooler.

  • Coral
  • Algae
  • Mosses
  • Tetrahedral Spores

Laurasia

Gondwana

  • Supercontinent
  • Warm, humid
  • Drifted to south pole and submerged in water
  • Laurentia, Baltica, Siberia, Kazakhstania, North and East China
  • Volcanoes
  • Ash cloud
  • Blocked sun
  • Making it cold
  • Starting glaciation

Silurian

Ordovician

  • Trilobites
  • Conodonts
  • Graptolites

Theories

  • Agnatha
  • Romundina
  • Eurypterids
  • Arthopods
  • Millipedes and Arachnids
  • Blastoids
  • Bryozoans
  • Corals
  • Crinoids
  • Brachiopods
  • Snails
  • Clams
  • Cephalopods

1)Breakup and movement of super continent

2)Earth cooled (oceans covered in ice)

3)Changes occurred in Ocean Chemistry

4)Gamma Ray Burst Hypothesis

5)Volcanism and Weathering

Earth cooled (oceans covered in ice)

Most commonly accepted

http://research.omicsgroup.org/index.php/Ordovician–Silurian_extinction_events

https://www.britannica.com/science/Ordovician-Silurian-extinction

https://earth.usc.edu/~stott/Catalina/Ordovician.html

http://www.oldearth.org/curriculum/history/earth_history_c4_Ordovician_extinction.htm

https://www.aps.org/publications/apsnews/200407/extinction.cfm

http://news.nationalgeographic.com/2015/09/15911-metals-extinction-ocean-oxygen-ordovician-silurian/

http://passengerpigeon.info/periods.html

http://www.ucmp.berkeley.edu/ordovician/ordovician.php

http://www.newworldencyclopedia.org/entry/Ordovician

http://www.livescience.com/43514-silurian-period.html

https://www.nap.edu/read/11630/chapter/7

http://www.livescience.com/43514-silurian-period.html

http://www.encyclopedia.com/earth-and-environment/geology-and-oceanography/geology-and-oceanography/ordovician-period

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