5 Mass Extinctions

oceayen
Mind Map by oceayen, updated more than 1 year ago
oceayen
Created by oceayen about 6 years ago
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9-Li, Ma'am Tenchavez

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5 Mass Extinctions
  1. Ordovician
    1. 25% to 50% became extinct
      1. sea life (i.e. trilobites, brachiopods, graptolites) drastically reduced in number
      2. Devonian
        1. 75% became extinct
          1. water bed dried up
            1. sea bed became devoid of oxygen
            2. Permian
              1. 96% became extinct
                1. "The Great Dying"
                2. Triassic
                  1. marine reptiles, some large amphibians, many reef-building creatures, large numbers of cephalopod mollusks died
                    1. plants were not so badly affected
                    2. Cretaceous
                      1. K/T extinction
                        1. death of dinosaurs, many flowering plants, and last of pterosaurs
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