Since so many wrong dates are found, how would we know which dates are "correct? Then skull #KNM-ER 1470 was found (in 1972) under the KBS tuff by Richard Leakey. 1999 Lava from the 1801 Hawaiian volcano eruption gave a K-Ar date of 1.6 Million years old. B., 1969 40Ar/36Ar analysis of historic lava flows. There are about 7 or 8 radioactive elements that are used today to try to date objects. A hominid species assumed to be an ancestor of Homo sapiens, erectus was thought to have vanished some 250,000 years ago. "Structure, metamorphism, sedimentary reworking, and other complications have to be considered." For years the KBS tuff, named for Kay Behrensmeyer, was dated using Potassium Argon (K-Ar) at 212-230 Million years. It looks like modern humans but was dated at 2.9 million years old. Etna, Sicily (122 BC) gave K-AR age of 250,000 years old. B., 1969 40Ar/36Ar analysis of historic lava flows. Each one has a different half-life and a different range of ages it is supposed to be used for. But even though he used two different dating methods, Swisher kept making the same startling find: the bones were 53,000 years old at most and possibly no more than 27,000 years— a stretch of time contemporaneous with modern humans." --Kaufman, Leslie, "Did a Third Human Species Live Among Us? Radiometric dating would not have been feasible if the geologic column had not been erected first." --O’Rourke, J.This would prove the earth is not yet 30,000 years old!
This is why most people say carbon dating is only good for objects less than 40,000 years old.
Nothing on earth carbon dates in the millions of years, because the scope of carbon dating only extends a few thousand years.
This radioactive carbon 14 slowly decays back into normal, stable nitrogen.
Extensive laboratory testing has shown that about half of the C-14 molecules will decay in 5730 years. After another 5730 years half of the remaining C-14 will decay leaving only ¼ of the original C-14. In theory it would never totally disappear, but after about 5 half lives the difference is not measurable with any degree of accuracy.
An illustration may help: Imagine you found a candle burning in a room, and you wanted to determine how long it was burning before you found it.