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Bookmark or Share- Geologic time | Periods, Time Scale, & Facts | BritannicaSignificant moments in Earth's history. Grand Canyon rock layering. The steep walls of the Grand Canyon contain a number of layers of sedimentary rock laid down over millions of years. The lower formations belong to the early Precambrian age, while the upper layers are of the Paleozoic age.
- Geologic time scale - WikipediaGeologic time scale. The geologic time scale, proportionally represented as a log-spiral with some major events in Earth's history. A megaannus (Ma) represents one million (10 6) years. The geologic time scale or geological time scale ( GTS) is a representation of time based on the rock record of Earth.
- How Did Scientists Calculate the Age of Earth?In 1862, a famous Irish physicist and mathematician, Lord Kelvin, estimated that Earth was between 20-million and 400-million years old. While that is an enormous span of time, even an age of 400 million years would make the planet quite young in relation to the rest of the universe.
- Geological Time - Digital Atlas of Ancient LifeYet, compared to such human-made objects, the vastness of geological time—which is measured by millions and billions of years, and referred to by essayist John McPhee as “ deep time ”—is truly staggering, a view captured eloquently in a recent essay in the New York Times by Peter Brannen.
- 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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