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Name the hierarchy of geologic time
- Eon
- Era
- Period
- Epoch
- Age
- Chron
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Describe the etymology of the 2 eons
- Phanerozoic: Visible Life
- Precambrian (supereon): Before the Cambrian period (Proterozoic, Archean, Hadean eons)
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Describe the etymology of the 3 eras in the Phanerozoic eon
- Cenozoic: New Life
- Mesozoic: Middle Life
- Paleozoic: Old Life
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Describe the etymology of the 3 periods in the Cenozoic era
- Quaternary: younger than Tertiary
- Neogene: Recent Born (aka upper Tertiary)
- Paleogene: Old Born (aka lower Tertiary)
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Describe the etymology of the 2 epochs in the Quaternary period
- Holocene: Wholly New
- Pleistocene: Most New
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Describe the etymology of the 2 epochs in the Neogene period
- Pliocene: More New (90% fossils still alive)
- Miocene: Less New (18% fossils still alive)
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Describe the etymology of the 3 epochs in the Paleogene period
- Oligocene: Few New
- Eocene: Earliest New (9.5% fossils still alive)
- Paleocene: Old New
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Describe the etymology of the 3 periods in the Mesozoic era
- Cretaceous: chalky
- Jurassic: Jura mountains
- Triassic: three
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Describe the etymology of the 6 periods in the Paleozoic era
- Permian: Perm region in Russia
- Carboniferous: Coal Bearing
- Devonian: Devon region in England
- Silurian: Silures tribe in Wales
- Ordovician: Ordovices tribe in Wales
- Cambrian: Wales
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T or F? The Paleozoic era was originally called the Primary era
True: Giovanni Ardvino named it Primary in 1759 but it has been deprecated
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T or F? The Mesozoic era was originally called the Secondary era
True: Giovanni Ardvino named it Secondary in 1759 but it has been deprecated
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T or F? The Cenozoic era was originally called the Tertiary era
True: The deprecated term tertiary corresponded to the Paleogene and Neogene periods within the Cenozoic era. The Cenozoic era includes the Quaternary period as well.
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How long were the eons?
- Phanerozoic: 542 mya-present (542 my, 12% of earth's age)
- Precambrian: 4600-542 mya (4057 my, 88% of earth's age)
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How long were the 3 Phanerozoic eons?
- Cenozoic: 66 mya-present (66 my)
- Mesozoic: 252-66 mya (186 my)
- Paleozoic: 541-252 mya (289 my)
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How long were the 3 periods in the Cenozoic era?
- Quaternary: 2.58 mya-present (2.58 my)
- Neogene: 23-2.58 mya (20.42 my)
- Paleogene: 66-23 mya (43 my)
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How long were the 3 periods in the Mesozoic era?
- Cretaceous: 145-66 mya (79 my)
- Jurassic: 201.3-145 mya (56.3 my)
- Triassic: 252-201.3 mya (50.7 my)
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How long were the 6 periods in the Paleozoic era?
- Permian: 298.9-252 mya (46.9 my)
- Carboniferous: 358.9-298.9 mya (60 my)
- Devonian: 419.2-358.9 mya (60.3 my)
- Silurian: 443.8-419.2 mya (24.6 my)
- Ordovician: 485.4-443.8 mya (41.6 my)
- Cambrian: 541-485.4 mya (55.6 my)
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How long (millions of years) were the 11 ages of the Jurassic Period?
- Upper Epoch: 163.5-145 mya - Tithonian (7.1), Kimmeridgian (5.2), Oxfordian (6.2)
- Middle Epoch: 174.1-163.5 mya - Callovian (2.6), Bathonian (2.2), Bajocian (2), Aalenian (3.8)
- Lower Epoch: 201.3-174.1 mya - Toarcian (8.6), Pliensbachian (8.1), Sinemurian (8.5), Hettangian (2)
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