1. Taming the T-rex …And other dinosaurs CHALLENGING EARTH HISTORY: Part III The Death Elaine Kennedy, Ph.D. Geoscience Research Institute http://www.grisda.org

2. What Happened to the Dinosaurs? Psittacosaurus

3. Demise of Dinosaurs Volcanism => Climate Change?Volcanism => Climate Change? –Loss of link in food chain expected but not documented Asteroid Impact?Asteroid Impact? –Most dinosaurs already dead before K/T event Evolved into Birds?Evolved into Birds? –Lack of evidence & mechanism Destroyed by Water?Destroyed by Water? –Dinosaur remains found in water-laid deposits worldwide

4. Data: T. rex Large muscle attachment scars on jaws and armsLarge muscle attachment scars on jaws and arms Enlarged optic & olfactory lobes, serrated teethEnlarged optic & olfactory lobes, serrated teeth 14 nearly complete skeletons14 nearly complete skeletons JuvenilesJuveniles

5. Data: Hadrosaur Maiasaura Self-sharpening and nipping teethSelf-sharpening and nipping teeth JuvenilesJuveniles EggsEggs Nests?Nests?

6. Distribution of death Dinosaurs suddenly appear on four continents in the upper Triassic! Dinosaurs go extinct in the upper Cretaceous!

7. Sedimentary Deposits Flood deposits in CanadaFlood deposits in Canada Lake, river, flood plain, coastal, lowland deposits in the United StatesLake, river, flood plain, coastal, lowland deposits in the United States River deposits in South AmericaRiver deposits in South America Debris flow deposits in MongoliaDebris flow deposits in Mongolia Flood deposits in ChinaFlood deposits in China Marsh, island, delta, coastal deposits in EuropeMarsh, island, delta, coastal deposits in Europe

8. Part III: Summary The destruction and preservation of dinosaurs in water-laid deposits worldwide has provided an extensive database for study.