Carbon dating used date specimens Aseandating

It cannot be used to date rocks, both because of its short half life (about 5,000 years), and because it can only be used to date the remains of living things (such as bones, or wood).

Rocks are dated using other methods, such as Uranium-Lead dating, which has a much longer half life (over 700 million years).

Conservationist and Preservationists will also use carbon dating to find the date of objects they are working on.The fluctuation of the amount of C-14 in the atmosphere over time adds a small uncertainty, but contamination by "modern carbon" such as decayed organic matter from soils poses a greater possibility for error. Thomas Seiler, a physicist from Germany, gave the presentation in Singapore.He said that his team and the laboratories they employed took special care to avoid contamination.Carbon 14 is used, mainly by archaeologists, to date bones and other formerly living matter but not normally fossils.This is because the half-life of that isotope is 5730 years; it is useful for dating up to 50,000 - 60,000 years but no more.

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That is, if they really are over 65 million years old, as the conventional wisdom says. A lone femur bone was excavated in 2004 in Cretaceous clay at 47 6 18N by 104 39 22W in Montana by the O. Miller team in 2005 to retrieve samples for C-14 testing. Collagen: Proteins that are the main component of connective tissue.

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