Mesozoic History - Mesozoic Life After Permian extinction...

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4/10/11 1 Mesozoic Life After Permian extinction Seas were dominated by an abundance of mollusks, sea urchins, crustaceans and fish & reptiles. On land, synapsids were replaced by reptiles. – crocodiles, turtles, snakes, lizards and dinosaurs Mesozoic events Mesozoic paleogeography Mesozoic is the "Age of Dinosaurs" But also flying reptiles and birds. The earliest mammals were living in the underbrush. At the end of the Mesozoic, flowering plants had become the dominant plant on land. Late Cretaceous Climate
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4/10/11 2 Climate During Mesozoic times, the poles were warm and sea levels were high - so deep ocean circulation was less vigorous. This led to the preservation of organic Carbon in sediments by reducing the rate of O2 Evidence supports a greenhouse world in the middle Cretaceous. But where did all this CO2 come from? Volcanoes. NO ice in the Mesozoic! Icebox v. hothouse ocean Most dramatic change took place in the oceans No more crinoid meadows. In their place, the mollusks began to rapidly evolve and fill in all the empty niches. In contrast, the brachiopods never produced these adaptations and fell victim to shell crushing predators. Echinoderms changed their habitat and became armored. In place of the rugose and tabulates arose the modern or scleractinian corals. Mesozoic ocean life It was also the “Age of Ammonoids” Great index fossils. Pelagic w/ global distribution. Sutures are very important for classification. Bemenites common as well. Cephalopod sutures • Nautititic • Goniatitic • Ceratitic • Ammonitic
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4/10/11 3 WOW! Mesozoic gastropods Rudistid Bivalves belemnites Mesozoic echinoderms Planktic microfossils The most important change in the oceans. The base of the food chain
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4/10/11 4 Coccolith and Foraminifera Made up of calcareous protists! Dinoflagellates & Diatoms radiolarians Phytoplankton abundance Marine Vertebrates Cephalopods were the most common swimming animals, but there was a huge radiation of fish.
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