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20 Cards in this Set
- Front
- Back
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Eon
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Consists of several geologic eras
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Era
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Major division of geologic time composed of a number of periods
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Period
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- Basic unit of geologic time
-made up of 2 or more epochs |
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The 4 Eons
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- Hadeon
- Archeon -Proterozoic -Phanerozoic |
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Hadeon Eon
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4.5 - 3.8 BYA
formation of earth no oxygen in the atmosphere anaerobic single celled organisms ecisted |
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Archeon Eon
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3.8 - 2.5 BYA
Existance of cyanbacteria Oxygen =<1 %, still toxic Atmosphere made up of mostly nitrogen, ammnonia and other gases |
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Proterozoic Eon
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2.5 - 0.5 BYA
Tectonic activity of earth first known eukaryotic fossil discovered Oxygen = 5-18%, became harmless Organisms evolve to carry out oxidative respiration Could produce lots of energy from Mitochondria |
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Phanerozoic Eon
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541MYA - Present
Consists of three eras; - Paleozoic - Mesozoic - Cenozoic ( Divergence of Primates ) |
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Paleozoic Era
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540- 252 MYA
Denovian, Missipians periods etc characterised by the appearence of marine invertebrate such as marine fish, and land plants |
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Mesozoic Era
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230 - 65 MYA
characterised by the appearance of the reptiles such as dinosaurs and flowering plants |
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Cenozoic Era
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65 MYA - Present
characterised by the ascendancy of mammals Tertiary and Quarternary Periods |
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3 Periods of Cenozoic Era
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- Paleogene
-Neogene -Quarternary |
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Quaternary Period
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Time in which humans have evolved.
Homo Genus Within Cenozoic Era |
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Paleocene Epoch
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Paleogene Period
65 - 59 MYA Earliest primates began to diverge |
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Eocene Epoch
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Earlist Definite primates appeared ~ 56 - 38 MYA
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Oligocene Epoch
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First period where continents were not connected
33- 23 MYA Most fossils derived from Fayum, Egypt ( Apidum and Aegyptopithecus ) |
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Miocene Epoch
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Part of Neogene Period
Known as the ''Golden Age'' of Hominoids Fossils located in Africa, Asia and Europe Hominoids grouped geographically Spectacular hominoid radiation |
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Pilocene Epoch
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5.3 - 2.5 MYA
Follows Miocene Epoch Gigantopithecus, Orrorin Australopithecus times |
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Pleistocene Epoch
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2.5 - 0.1 MYA
Found in the Quarternary Period Evolution of Man, Homo |
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Pilo- Pleistocene
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Time Range of 5-1 MYA
Time period of earliest hominid fossils discovered in Africa |
