Charles Lyell
Charles Lyell explained this process with his theory of uniformitarianism.
Geological eras can be divided into periods, epochs and ages.
Periods are subdivided into periods of time know as epochs.
Eons, Eras,Epochs, and period
Dinosaurs died in the Cretaceous, Jurassic, and Triassic periods, but became extinct at the end of the Cretaceous.
Charles Lyell
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Charles Lyell explained this process with his theory of uniformitarianism.
Lyell's work explained how geological features could be built up or torn down over long periods of time.
Geo means earth, and "ology" is the study of. Geology, therefore, refers to the study of the earth, and geological pertains to that, such as the time periods or features of the earth.
Periods are subdivisions of geological eras.
Geological eras can be divided into periods, epochs and ages.
periods
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Periods
Eras are based one the worldwide changes in types of fossils. Periods are based on types of life worldwide. The Cenozoic era is the geological time scale is divided into both periods and epoch.