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| fossilized remains of organisms that lived and died within a particular time segment in Earth's history |
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| the study of life that existed in prehistoric times |
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| process by which radioactive isotopes emit or capture tiny particles; includes alpha, beta decay and electron capture |
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| process of placing events is the sequence in which they occured; not actual dates |
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| layers of sedimentary rock that form after particles settle out of a fluid and are compressed over time |
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| indirect evidence of live preserved as an impression in rock: trails, footprints, tracks, burrows, bite marks |
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| the layer or layers of rock missing from a strata sequence |
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| one of the many forms of animals that dominated the Mesazoic era |
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| longest segment of geologic time |
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| brief periods of geologic time and the distinguishing changes in life are not as great as those between periods |
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| a major division of geologic time |
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| the process of change that produces new life forms over time |
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| summary of major events in Earth's past that are perserved in the rock record |
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| subdivision of a geologic era that differ from one another in characteristic plant and animal life |
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| all geologic time before the start of the Cambrian period in the Paleozoic Era |
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| the most common preserved Cambrian animal |
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