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18 Cards in this Set
- Front
- Back
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What are the major events and relative times for the Archean Era?
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-3.8-2.5bya
• Reducing atmosphere of methane, ammonia and other gases. • Earth’s crust cooled, and continents begin to form. -The Archean Era was witness to the origin of life, the diversification of bacteria, the evolution of photosynthesis and aerobic respiration. |
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What are the major events and relative times for the Proterozoic Era?
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-2.5 bya-543mya
• Stable continents appear. • Abundant fossils of photosynthetic bacteria. • Oxygen buildup. • Led to build up of ozone layer, O3, reducing amount of harmful UV radiation reaching the surface of the earth. • First eukaryotic cells 1.8 bya. • Multicellular algae evolved by 1bya. |
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What are the major events and relative times for Snowball Earth?
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- 750-650 mya
• Earth was covered with a sheet of ice. • Glaciation followed by extreme heating. • May have prevented multicellular animals from evolving. |
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What are the major events and relative times for the Ediacarian period?
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-650-540 mya
• First multicellular, presumably eukaryotic life appears. • Some may be related to cnidarians and other modern group of animals. • Others not readily interpretable in the framework of modern organisms • Almost all of them go extinct right at the start of the Cambrian. |
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What are the major events and relative times for the Paleozoic Era?
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-543-248 mya
– At the start of the Paleozoic, over a 20 million year period have the appearance of all major animal phyla – The end of the Paleozoic marks the Permian extinction – In the middle of the Paleozoic animals, plants and fungi colonized land |
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What are the major events and relative times for the Cambrian Period?
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-543- 490 mya
• The Cambrian Explosion |
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What are the major events and relative times for the Ordovician Period?
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-490-443 mya
• Marine invertebrates dominate and diversify. • Jawless armored fish • Second biggest mass extinction in the history of life. |
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What are the major events and relative times for the Silurian Period?
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-443-417mya
• Diversification of jawless fish and origin of jawed fishes. • First evidence of life on land. |
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What are the major events and relative times for the Devonian Period?
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-417-354 mya
• Spiny trilobites diverse • Diversification of bony fishes • Diversification of land plants • Origin and radiation of terrestrial life • Ends with a mass extinction |
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What are the major events and relative times for the Carboniferous Period?
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-354-290 mya
• Origin of the amniotes - reptiles • Diversification of amphibians • Large winged insects • Ancient forests of ferns and lycopsids. • Decline of the trilobites • Ancient fishes replaced by modern-looking fishes |
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What are the major events and relative times for the Permian Period?
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-290 to 248 mya
• Supercontinent Pangea • Diversification of reptiles, including mammal-like reptiles. • Fern-like plant to gymnosperm forests • The largest mass extinction in the history of life. |
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What are the major events and relative times for the Mesozoic Era?
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-248-65 mya
-Age of the Dinosaurs -Drastic change of fauna from Paleozoic |
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What are the major events and relative times for the Triassic Period?
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-248-206mya
– Pangea altered global climate and ocean circulation. – Survivors of the extinction spread, recolonized and radiated. – Stem group dinosaurs |
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What are the major events and relative times for the Jurassic Period?
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-206-144 mya
• Dominated by plant-eating dinosaurs and smaller vicious carnivores. • Oceans with fish, squid and ammonites • Ichthyosaurs, plesiosaurs and pterosaurs. |
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What are the major events and relative times for the Cretaceous Period?
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-144-65 mya
• Pangea continues to break up. • Regional differences in floras and faunas between the north and south. • Origin of angiosperms • Extinction of the dinosaurs and ammonites. |
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What are the major events and relative times for the Cenozoic Era?
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-65mya-present
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What are the major events and relative times for the Tertiary Period?
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-65-1.8mya
• At first had warming of climates, expansion of grasslands. • Radiation of mammals, flowering plants, insects, fish and birds. |
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What are the major events and relative times for the Quaternary Period?
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-1.8 million-present
• Episodes of global cooling -ice ages • Extinction of large mammals |
