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Bookmark or Share- Geologic time | Periods, Time Scale, & Facts | BritannicaGeologic time, the extensive interval of time occupied by the geologic history of Earth. Formal geologic time begins with the Archean Eon (4.0 billion to 2.5 billion years ago) and continues to the present day. Modern geologic time scales also include the Hadean Eon (4.6 billion to 4.0 billion years ago).
- Geologic Time Scale: A List of Eons, Eras, and Periods - ThoughtCoThe next geologic eon, the Archean, began about 4 billion years ago. During this period, the cooling of the Earth's crust allowed for the formation of the first oceans and continents. Scientists are not exactly sure what these continents looked like since there is so little evidence from the period.
- How Did Scientists Calculate the Age of Earth?Scientists have calculated the age of our planet to be approximately 4.5 billion years. But how did scientists determine that age? The answer is complicated: It involves everything from observation to complicated mathematics to understanding the elements that make up our planet.
- Age of the universe - WikipediaIn July 2023, a study published in the Monthly Notices of the Royal Astronomical Society journal put the age of the Universe as 26.7 billion years.
- How Do We Know the Earth Is 4.6 Billion Years Old?Based on the very old zircon rock from Australia we know that the Earth is at least 4.374 billion years old. But it could certainly be older. Scientists tend to agree that our little planet is...
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