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08-Dec-2019 05:37

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Thus in fossil dating, the layer of the earth in which the fossil was found will be important in finding the age.

Once a working model has been found, this can be used to compare similar fossils.

The Jurassic Maiopatagium and Vilevolodon are long-extinct relatives of living mammals. Luo said they are haramiyidans, an entirely extinct branch on the mammalian evolutionary tree, but are considered to be among forerunners to modern mammals.

Both fossils show the exquisitely fossilized, wing-like skin membranes between their front and back limbs.

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It may stay this way for millenniums until it once again gets smashed into sand, a grain swallowed by an oyster where it grates and grinds along with other bits of sand, until a beautiful pearl has been created.

The interesting part is that it is all still around, even though shuffled from here to there.

Yet this fascination is fairly new, about a hundred years old, actually.

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Frank Libby, a chemist who worked with the Manhattan Project during World War II is credited with radioactive dating, that is dating materials that had once been alive.

Further research at the University of Berkeley on-line shows two different kinds of fossil and rock dating: The first method, calculations based on geological layers and the fossils found in them; the second method, “radio age dating,” measuring the amount of radioactive decay is a recent 20th century method.



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