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geologic time scale
This term refers to a specialized scientific framework used by geologists and paleontologists to organize the vast history of Earth. It is characterized by a hierarchical structure where larger units like eons are subdivided into eras, which are further split into periods and epochs. The boundaries between these divisions are typically defined by major biological events, such as mass extinctions, or significant changes in rock strata.
In academic and professional discourse, the term is used as a fixed technical compound. While "geologic" is the standard American English spelling, "geological" is frequently used in British English and other international contexts without any change in meaning.
Meanings
Examples
The professor asked us to label the different eras on the geologic time scale.
It is hard to wrap my head around the sheer magnitude of the geologic time scale.
Where does the Cambrian explosion fit into the geologic time scale?
The geologic time scale provides a framework for understanding the evolution of life on Earth.
I wonder how much the geologic time scale will change as we discover more fossils.
Let us look at the geologic time scale to see when the dinosaurs went extinct.
The geologic time scale is divided into eons, eras, periods, and epochs.
Human history is a mere blink of an eye when compared to the geologic time scale.