4b+Paleozoic+-+Dinosours++and+Mammals

4b+Paleozoic+-+Dinosours++and+Mammals - 10/1/09...

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10/1/09 1 Macro-Evolution: From Dinosaurs to the Dominance of Mammals I. The Mesozoic Era: The Dominance and Demise of the Dinosaurs II. The Cenozoic and the Dominance of Mammals III.The Success of Mammals IV. Continental Drift and Mammalian Diversity V. The Placenta in Mammals (Began DOMINANT ERA PERIOD EPOCH m.y.a.) ANIMALS CENOZOIC Quaternary Holocene 0.01 MAMMALS CENOZOIC Quaternary Pleistocene 1.8 MAMMALS CENOZOIC Tertiary Pliocene 5 MAMMALS CENOZOIC Tertiary Miocene 25 MAMMALS CENOZOIC Tertiary Oligocene 35 MAMMALS CENOZOIC Tertiary Eocene 55 MAMMALS CENOZOIC Tertiary Paleocene 65 MAMMALS MESOZOIC Cretaceous 135 Reptiles :DINOSAURS MESOZOIC Jurasic 190 Reptiles: DINOSAURS MESOZOIC Triasic 225 Reptiles: DINOSAURS PALEOZOIC Permian 280 Fish PALEOZOIC Carboniferous 345 Fish PALEOZOIC Devonian 395 Fish PALEOZOIC Silurian 430 Fish PALEOZOIC Ordovician 500 Fish PALEOZOIC Cambrian 570 Fish I. THE MESOZOIC AND THE DOMINANCE OF DINOSAURS A. About 380 million years ago, the first animals to make the transition to land were the amphibians, which descended from lobe-finned fishes (crossopterygian). B. About 249 million years ago, several varieties of mammal- like reptiles with backbones and an internal skeleton, collectively known as vertebrates, began to colonize the land and sea. C. About 225 million years ago, during the Triassic period of the Mesozoic era, reptiles such as the dinosaurs became the dominant land vertebrates. D. Dinosaurs were mostly herbivores, but some were also carnivores
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10/1/09 2 I. THE MESOZOIC: THE DOMINANCE OF DINOSAURS A. About 65 million years ago, a comet or asteroid collided with the earth, creating a global dust cloud that: 1. blocked sunlight and prevented plants from photosynthesizing and starved herbivorous animals 2. cooled the planet. I. THE MESOZOIC & THE DEMISE OF DINOSAURS The real reason dinosaurs became EXTINCT! (Source: The far side, Gary Larson, 2000)
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10/1/09 3 A. Dinosaurs could not maintain a warm body temperature B. Because most Dinosaurs were carnivores when their herbivorous prey succumbed to the lack of available plant resources they also became extinct. C. Descendants of dinosaurs such as the emu and ostriches, are still living today . I. THE MESOZOIC & THE DEMISE OF DINOSAURS DINOSAURS AND FOOD SOURCE Traditional View of Dinosaur’s Dietary Pattern *Dinosaurs were all carnivores New Interpretation about Dinosaur’s Dietary Pattern a. Some were herbivores: plant eaters and grazers. b. Some were carnivores
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4b+Paleozoic+-+Dinosours++and+Mammals - 10/1/09...

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