BIOL 331 Lecture Notes - Paleozoic, Mollusca, Cambrian Explosion
29 Jan 2013
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The jurassic (200-145 mya: two large continents: laurasia (laurentia (= na) + eurasia) & gondwana (after region in. The cretaceous (145-65 mya: gondwana breaking apart, and a continuous ocean circled the tropics. & earth was warm and humid: flowering plants (angiosperms) evolved from gymnosperms. Many groups of mammals had evolved, but most were small. This dramatically increased n available for terrestrial plants: the cenozoic is divided into two periods, the tertiary and the quaternary. In the tertiary period (65 1. 8 mya), australia began its drift northward. Invertebrates resembled those of today. bridge: rodents, marsupials, primates, and hoofed mammals appeared in north america for the first time. In the current holocene epoch, some organisms are still adjusting to climatic fluctuations: many high-latitude ecological communities have occupied their current locations for no more than a few thousand years. Living fossils: species whose morphology has changed little over millions of years are known as living fossils ; ex.
