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Table 25.1 review.docx

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Biology (Biological Sciences)
Richard Moses

Table 25.1 • Triassic Period – part of the Phanerozoic Eon and the Mesozoic Era o 200-250MYA o Cone-bearing plants dominate landscape o Dinosaurs evolve and radiate o ORIGIN OF MAMMALS • Protereozoic Eon – eon containing eukaryotic life o From 2.5BYa – 542 MYa o Around 2.5Bya oldest fossils of eukaryotes appear • Phanerozoic Eon – from 542Mya to present o Includes the Paleozoic Era, Mesozoic era and current Cenozoic Era o Eon begins with Cambrian explosion • Permian Period – Last period of paleozoic era in phanerozoic eon o Radiation of reptiles o Origin of most present-day groups of insects o Extingction of many maring and terrestrial organisms at end of period o About 250-300MYa • Paleogene Period – 23-65.5Mya o First period of the Cenozoic Era in the Phanerozoic Eon o In paleocene epoch  Major radiation of mammals, birds and pollinating insects o In Eocene epoch  Angiosperm dominance increases; continued radiation of most present- day mammalian orders o In Oligocene epoch  Origins of many primate groups, including apes • Ordovician Period – Period after Cambrian – colonization of land by diverse plants, fungi and animals o 490-445Mya o Marine algae abundant o Paleozoic Era • Oldest Eukaryote fossils – about 2.5Bya in the Proterozoic Eon o Some research says 2.7Bya • First land Plants – occurred in the Ordovician Period of the Paleozoic era of the Phareozoic eon o 490-445Mya • First flowering plants – angiosperms first appeared during the Cretacious period of the Mesozoic era of the Phanerozoic eon o 145.5-65.5Mya • First Animals – Ediacaran era of the proterozoic eon o Between 635 and 542Mya – diverse algae and soft-bodied invertebrate animals appear • Ediacaran Period – the end of the Proterozoic eon – animals first appear and diverse algae o 635-542Mya • Dissapearance of Dinosaurs – occurred in the Cretacious Period of the Mesozoic Era of the Phareozoic Eon about 145.5-65.5Mya • Cretacious Period – the last period of the Mesozoic era of
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