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having no living members

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the science of determining the relative order of past events, without necessarily determining their absolute age

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a fossil that is useful for dating and correlating the strata in which it is found

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a method of dating geological or archeological specimens by determining the relative proportions of particular radioactive isotopes

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the time taken for the radioactivity of a specified isotope to fall to half its original value

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a system of chronological dating that relates geological strata to time

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a long and distinct period of history

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a length or portion of time.

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a theory explaining the structure of the earth's crust and many associated phenomena as resulting from the interaction of rigid lithospheric plates which move slowly over the underlying mantle

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generally what we see when we look at the large-scale history of life.

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the standard rate of extinction in earth's geological and biological history before humans became a primary contributor to extinctions

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a policy of gradual reform rather than sudden change or revolution

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1. hypothesis that evolutionary development is marked by isolated episodes of rapid speciation between long periods of little or no change.

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1. the diversification of a group of organisms into forms filling different ecological niches.

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is the independent evolution of similar features in species of different periods or epochs in time.

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of the origin of eukaryotic cells from prokaryotic organisms,