Geologic Time- Time Scale, Chapter 4 Section 4 – Flashcards
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What is the order of time divisions from large to small?
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Eons, Eras, Periods, Epochs
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Which "chunk" of time lasted the longest?
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Precambrian
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What types of fossils, other than blue-green algae, were found at the very end of the Precambrian?
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Trilobites and brachiopods
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What does the word "Paleozoic" mean?
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Old life
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The name for the large number of preserved fossils found immediately after the Precambrian.
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Cambrian Explosion
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The time period known for the first mammal-like reptiles (Dimetredon)
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Permian
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The age of the largest mass extinction *95% of all life on Earth goes extinct *Cause of the extinction is unknown
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The end of the Paleozoic Era
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"Middle life"
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Mesozoic era
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"Old life"
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Paleozoic
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The time period when: *the first fossils of dinosaurs appear (small) *the first mammal fossils appear (nocturnal) *gymnosperms (nonflowering plants) common
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Triassic
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"The age of dinosaurs"
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Term for the Jurassic
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The time period when: *the dinosaur fossils are larger *the first fossilized bird is found (archaeopteryx)
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Jurassic
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The time period when: *there are many bird fossils found *the dinosaur fossils are very large *the first angiosperm (flowering plants) fossils are found
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Cretaceous
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The age of a very large mass extinction occurred. *75% of the Earth's species go extinct *The cause of the extinction is well documented
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The end of the Mesozoic era
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"Age of the mammals"
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Term for the Cenozoic era
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The time period when: *first homo sapien fossils found (human beings) *ice ages occurred (Pleistocene Epoch)
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Quaternary
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The scientific study of the origin, history, and structure of the Earth and the processes that shaped the Earth.
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Geology
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The standard method used to divide the Earth's long history into manageable parts.
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Geologic Time Scale
