Fossils, Geologic Time
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| Paleontology | Study of fossils
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| Known Age | The age of an artifact as determined by a date printed on it or a reference to the artifact in a work of history.
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| dendrochronology | the process of counting tree rings to determine the age of a tree.
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| master tree ring pattern | groups of tree ring patterns that archaeologists catalog for specific global regions.
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| radiometric dating | using radioactive process to determine the age of an item
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| absolute age | the calculated age of an artifact from a specific dating method that is used to determine when the artifact was made.
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| principle of superposition | when artifacts are found in rock or earth that is layered, the deeper layers hold the older artifacts
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| relative age | age of something compared with the ages of other things
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| strata | distinct layers
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| permineralized/petrified | fossils in which teh spaces inside are filled with minerals from groundwater.
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| carbonization | thin film of carbon residue preserved as a fossil
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| carbonization | Common for most plant fossils.
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| cast | type of fossil that forms when crystals fill a mold or sediments wash into a mold and harden into rock
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| index fossils | remains of species that existed on Earth for a relatively short period of time, were abundant, and were widespread geographically
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| Eon | formed by two or more geological eras form , which is the largest division of geologic time, lasting many hundreds of millions of years.
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| era | comprised of two or more geological periods , which is hundreds of millions of years in duration.
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| period | The basic unit of geological time in which a single type of rock system is formed, lasting tens of millions of years.
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| Epoch | a division of a geologic period; it is the Smallest division of geologic time, lasting several million years.
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| Age | A unit of geological time which is distinguished by some feature ,like ice. Shorter than epoch, usually lasting from a few million years to about a hundred million years.
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| fossil | The preserved remains of a once-living organism.
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| In what era did Homo Sapiens evolve? | Cenozoic
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| In what era are Dinosaurs are dominant? | Mesozoic
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| In what era are Amphibians Dominant? | Paleozoic
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| In what period did Dinosaurs become extinct? | Cretaceous
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| In what era do the following periods belong: Quaternary, Neogene, Paleogene? | Cenozoic
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| In what era did the Appalachians beginto form? | Paleozoic
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| In what period did the Paleozoic Era begin? | Cambrian
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| What types of species appeared in the Cenozoic Era? | Humans, larger mammals
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| What types of species appeared in the Mesozoic Era? | Small mammals,birds, dinosaurs,
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| What types of species appeared in the Paleozoic Era? | Early reptiles,amphibians, fish, gymnosperms
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| What types of species appeared in the Precambrian Era? | Worms, jellyfish
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