The geology or deep time of Earth's past has been organized into various units according to events which took place in each period. Different spans of time on ... en.wikipedia.org
... period (mainly prehistoric), where geologic era refers to well-defined time spans. The next-larger division of geologic time is the ... en.wikipedia.org
EON, ERA, PERIOD. P H A N E R O Z O I C 540 mya through ... www.enchantedlearning.com
Noun, 1. geological era - a major division of geological time; an era is usually divided into two or more periods. era ยท geologic time, geological time - the time of ... www.thefreedictionary.com
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