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Geological dating wiki

We now know the timing of important events that have happened during the history of Earth.

The Earth is about 4.567 billion (4,567 million) years old.

For example, the boundary between the Cretaceous period and the Palaeogene period is defined by the Cretaceous–Tertiary extinction event.

This marked the end of the dinosaurs and of many marine species.

The geological or deep time of Earth's past has been organized into various units.

Radioactive elements of use in geological dating have relatively long half-lives.

These discussions were rendered obsolete by the discovery of radioactivity in 1896 by the French physicist Henri Becquerel.

The existence of radioactivities of various kinds in rocks has enabled earth scientists to determine the age of the Earth, the moon, meteorites, mountain chains and ocean basins, and to draw up a reasonably accurate time scale of evolution.

At the same time paleontologists define a system of faunal stages, of varying lengths, based on the kinds of animal fossils found there.

In many cases, such faunal stages have been adopted in building the geological nomenclature, though in general there are far more recognized faunal stages than defined geological time units.

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en​.wikipedia​.org​/wiki​/Datingrefers to seeking, arranging, and participating in meetings with potential intimate partners.

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