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Mesozoic Marine Life
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Lecture 23
5/4/98
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| | We start our look at the Mesozoic by examining the Marine communities that developed in the Mesozoic. |
| | The Permo-Triassic extinctions openned up opportunities for marine invertebrate to radiate into. |
| | Modern marine invertebrate faunas were developed during the Mesozoic |
| | Reptiles radiated into the marine realm as well, occupying niches now taken by whales & dolphins |
| | Splitting up Gondwanaland |
| | Openning of Atlantic Ocean |
| | beginning the the Triassic |
| | return of shallow epi-contintental seas |
| | Movement of North America & Europe north |
| | begins in the Triassic and continues throughout the Mesozoic |
| | Development of the Modern Fauna |
| | extensive radiation during the Jurassic and Cretaceous |
| | Disappear suddenly at the end of the Cretaceous (65 Ma) |
| | Modern corals first appear in the Middle Triassic in Tethys sea |
| | by the middle Jurassic (180 Ma) they are world-wide and forming reefs |
| | Ray-Fin boney fishes (teleost) |
| | increasing abundance through the Triassic and Jurassic |
| | have a major radiation in the Cretaceous (140-65 Ma) |
| | stream-lined dolphin like reptile |
| | Triassic to Jurassic (250-140 Ma) |
| | Large bodied reptile with a long neck and small head |
| | flipper span of 13 ft (4m) |
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