Datingfossils com

So, how do we know how old a fossil is There are two main types.

Instead, other methods are used two methods that can date. Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating.

Here are some specific results along this line; many more could be cited.

These were taken from a conference in 2012Fossils, coal, oil, natural gas, limestone, marble, and graphite from every Flood-related rock layer—and even some pre-Flood deposits—have all contained measurable quantities of radiocarbon.

Organic matter in the fossil record generally dates by carbon 14 (C14) dating to about 20,000 to 40,000 years. Many creationists believe that radioactive decay was faster in the past.

Other radioactive dating methods such as potassium/argon (K/Ar), rubidium/strontium (Rb/Sr), uranium/lead (U/Pb), thorium/lead (Th/Pb) and others that are based on decay of longer-lived isotopes often give ages in the millions or hundreds of millions of years for these fossils. However, in this talk I want to concentrate on reasons to believe the C14 dates are more accurate and that they give evidence that all life on earth is very young.

If decay rates were faster in the past, then even the C14 dates could be too old.

Carbon 14 is an isotope of carbon with two extra neutrons in the nucleus. The rate at which this happens varies to some extent.

After an organism dies, if it is buried and left undisturbed, the C14 in it gradually decays into nitrogen 14. Thus the ratio of C 14 to C12 in the remains of the organism gradually decreases with time.

Recent finds of Mary Schweitzer are also relevant for the dating of ancient bones.

Mary Schweitzer, a professor at North Carolina State University (North Carolina), has found soft tissue and protein in dinosaur bones.

Even more, proteins in this tissue retain their structure.

Extraordinary efforts were made to eliminate all contamination from the measuring apparatus.

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The half-life of C14 is 5730 years, although there are subtleties about how C14 ages are actually computed.

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