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Paleozoic Era

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Advantages of Hard Parts. Protection from UV - survive in shallow water ... Major Marine Animal Phyla. All originate end of Ordovician. By end of Pz. All ... – PowerPoint PPT presentation

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Title: Paleozoic Era


1
Paleozoic Era
Late
Middle
Early
543-248 Myr
2
RecallSkeletons and Shells
Small Shelly Fossils(SSFs) (Very)
LateProterozoic
3
Shells SkeletonsAdvantages of Hard Parts
  • Protection from UV - survive in shallow water
  • Prevents drying out - intertidal zone
  • Predator protection
  • Provides support - gt body size muscle
    attachment
  • Potential to build reefs

Advantage to Paleontologists - make better
fossils!
4
Major Marine Animal PhylaAll originate end of
Ordovician
5
By end of Pz All Phyla Present
6
Sepkoski Marine Evolutionary Faunas
7
Cambrian Explosion
Jump in Biodiversity
8
(No Transcript)
9
Wiwaxia
10
Hallucigenia
11
Opabinia
12
Anomalocaris
13
Pikaia - (early Chordate)
Your Great, Great, Greatnth Ancestor!
14
What Led to the Cambrian Explosion?
Hard Parts?
Predators?
Ocean Chemistry Threshold?
Metabalism?
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