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An ordered arrangement of rock layers that is based on the relative ages of the rock and in which the oldest rocks are at the bottom.
A unit of geologic time that includes two or more periods.
A unit of geologic time that is longer than an epoch but shorter than an era.
A subdivision of geologic time that is longer than an age but shorter than a period.
The process of change by which new species develop from preexisting species over time.
The interval of time in the geologic time scale from earths formation to the beginning of the paleozoic era, from 4.6 billion to 542 million years ago.
The geologic era that followed Precambrian time an that lasted from 542 to 251 million years ago.
An episode during which large numbers of species become extinct.
The geologic era that lasted from 251 million to 65.5 million years ago; also called the age pf reptiles.
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