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Transcript of Cenzoic Era
are three periods... In the Palaeogen Period, there are three epochs.
Oligocene: 38m - 24m years ago
Eocene: 54m - 38m years ago
Paleocene: 65m - 54m years ago By Nina Marine reptiles have become extinct,
but two groups of mammals – early
whales and sea-cows – begin to adapt
themselves to life in the sea. The ancestors of modern cats, dogs and bears evolve and the number of plant eating animals increases. Many varieties of modern mammals come into existence – ancestors of the elephant, the rhinoceros, the horse, the pig and cattle. Giant reptiles have disappeared, but crocodiles, turtles and land tortoises evolve as do all groups of insects that we know today. Flowering plants, including deciduous trees, become dominant. Cacti and Palm trees appeared As a cooler climate affects some parts of the world, forests dwindle and grass lands spread, leading to an increase in grass-eating mammals. At the beginning of the Paleocene period (around the end of the Paleogene Period), it was cooler and dryer than the previous period. During the Paleocene-Eocene, the climate became warm and humid, with subtropical vegetation growing in Greenland and Patagonia. During the Eocene, oceans were warm and full of fish and other sea life. Early marine mammals, including Basilosaurus, an early specie of whale appeared. Also at this time the first sirenians, relatives of the elephants appeared. Warm seas circulated the globe full of marine life of low diversity, but this trend reversed toward the end of the period. The abundant marine life included coral reefs. During the Oligocene, Oceans were cooling, particularly around Antarctica. North America and Europe separate Europe and North America are joined together India is not yet connected with Asia America and Africa have just separated Australia separates from Antarctica India crashes into Asia creating the Himalayan Mountains Antarctica is covered by glaciers
Sea levels are low The Antarctic region cooled down, with the surrounding ocean beginning to freeze. Continents drift towards their present positions Europe and Greenland were still connected; North America and Asia were still intermittently joined by a land bridge, while Greenland and North America were beginning to separate. http://www.fossils-facts-and-finds.com/paleogene_period.html http://science.nationalgeographic.com/science/prehistoric-world/paleogene/ http://en.wikipedia.org/wiki/Paleogene Debenham, F. The Readers Digest Great world atlas, Readers digest, London http://en.wikipedia.org/wiki/Oligocene http://en.wikipedia.org/wiki/Eocene http://en.wikipedia.org/wiki/Paleocene Elsom, D. 1998, Planet Earth, Marshall Publision, London Mackness, B. 1987, Golden Press, Sydney