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An Anglo-American team found large variations in levels of the carbon-14 isotope, used as the basis of carbon dating, preserved in a 19in stalagmite recovered from a submerged cave in the Blue Holes of the Bahamas, limestone caverns created when sea levels were nearly 330ft lower than today.These findings suggested dramatic changes in the amount of radioactive carbon in Earth's atmosphere during the last Ice Age, much greater than previously thought, probably as a result of changes in the strength of the planet's magnetic field."Beyond about 20,000 years ago there are some dramatic swings in radiocarbon concentration, which means the age offset between the radiocarbon age and true calendar age can be up to 8,000 years," said Dr David Richards of the School of Geographical Sciences, University of Bristol, who made the study with colleagues in Arizona and Minnesota.So if scientists believe that a creature lived millions of years ago, then they would need to date it another way. They assume dinosaurs lived millions of years ago (instead of thousands of years ago like the bible says).They ignore evidence that does not fit their preconceived notion.Stalagmites are calcium carbonate deposits left behind when carbon dioxide evaporates out of cave seepage water.
What many do not realize is that carbon dating is not used to date dinosaurs. Carbon dating is only accurate back a few thousand years.
The field of radiocarbon dating has become a technical one far removed from the naive simplicity which characterized its initial introduction by Libby in the late 1940's.
It is, therefore, not surprising that many misconceptions about what radiocarbon can or cannot do and what it has or has not shown are prevalent among creationists and evolutionists - lay people as well as scientists not directly involved in this field.
The approach was a sensation when it was introduced.
The chemist who developed carbon dating, Willard Libby, won the Nobel Prize for his work.
Radiocarbon dating, which depends on the steady decay of carbon-14, is less reliable if an artefact is older than 16,000 years.