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“geological time scale”
In geology, a system of measuring the history of the Earth by studying the rocks of the Earth's crust: In a geological time scale, new rocks are generally deposited on top of existing material, those lower down are oldest.
The strata of rock are classified according to their age, and a geological time scale corresponding to this can be constructed.
The main divisions (eras) are the Paleozoid, Mesozoic, and Cenozoic. These are further subdivided into periods and epochs.
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geo-, ge- +
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geological time scale, geologic time scale (s) (noun); geological time scales; geologic time scales (pl)
An arbitrary chronological arrangement of geological events: Normally a geological time scale is represented in the form of a chart, showing the names of various rock layers and indicating the estimated period of each geological unit of geological time.
This entry is located in the following unit:
geo-, ge- +
(page 12)