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How are rocks from the Cambrian period dated?

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Radiometric dating! Radioactive elements were incorporated into the Earth when the Solar System formed. read more

T. pedum can be found on most continents, and its chronological position puts it slightly younger than Ediacaran fossils (around 570 million years ago) and some 20 million years older than the small shelly fossils dated to the early parts of the Cambrian Period. read more

The Cambrian Period ( / ˈ k æ m b r i ə n / or / ˈ k eɪ m b r i ə n /) was the first geological period of the Paleozoic Era, of the Phanerozoic Eon. The Cambrian lasted 55.6 million years from the end of the preceding Ediacaran Period 541 million years ago (mya) to the beginning of the Ordovician Period 485.4 mya. read more

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