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| The largest Geological part of earth's history . |
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| The division of earth's history into time units . |
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| Major subdivisions of Geological time based on differences in life-forms . |
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| A group of organisms that normally reproduce with other members of their group . |
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| Organisms that lived hundreds of millions of years ago with bodies divided into three sections . |
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| Major divisions of an era . |
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| The single landmass the once contained all Earth's continents . |
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| Flying animals that evolved from dinosaurs . |
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| The time period where dinosaurs were the dominant life-form . |
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| Smaller units of time in a geologic period . |
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| Any gap left in a rock record . |
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| The remains, imprints, or traces of prehistoric organisms . |
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| The thin film of carbon the shows the outline of an organism . |
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| the fossils in which the spaces inside are filled with minerals from ground water . |
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| The age, in years, of a rock or other object |
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| Is somethings age in comparison to something else. |
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| the time it takes for half of the atoms in an isotope to decay . |
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| is the breaking down of some isotopes into other isotopes and particles . |
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| principle that says if rocks are undisturbed, older rocks are under younger rocks . |
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| is a method used to calculate the absolute age of a rock . |
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| cavity in rock form which an organism had decayed . |
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| The principle that Earth process occurring today are similar to those that occurred in the past |
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| fossil created when a sediment fills a mold and hardens . |
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a fossil that the remains of an organism that lived during a specific time that is used to define the age a of a particular rock layer .
fossils forn a species that existed on earth for a short period of time |
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