GEOLOGIC TIMESPAN Crossword Clue
GEOLOGIC TIMESPAN Crossword Clue
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Crossword Puzzle Infos
The term 'Geologic Timespan' refers to a period of time in Earth's history, usually measured in millions or billions of years. An ERA is a subdivision of this timespan, and is typically defined by the presence of certain fossils or geological features. Examples of Eras include the Paleozoic, Mesozoic, and Cenozoic.