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Before then, the Bible had provided the only estimate for the age of the world: about 6,000 years, with Genesis as the history book.Hutton's theories were short on evidence at first, but by 1830 most scientists concurred that Noah's ark was more allegory than reality as they documented geological layering.

Segment from A Science Odyssey: "Origins."Geologists have calculated the age of Earth at 4.6 billion years.

Fossils can't form in the igneous rock that usually does contain the isotopes.

The extreme temperatures of the magma would just destroy the bones.

For example, about 1.5 percent of a quantity of Uranium 238 will decay to lead every 100 million years.

By measuring the ratio of lead to uranium in a rock sample, its age can be determined.

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