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Carbon dating rocks

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First, carbon 14 is produced constantly but in tiny tiny amounts, in the upper atmosphere, but of all the carbon around only a trace amount is carbon 14, far less then! Its half life is about years. So every years the proportion of C14 is cut in half. SInce you start with a tny amount it only takes a few half life generations to get to an amount too small to be measured accurately. In practice the range of accuracy is perhaps 8 to 10 generations, sometimes a bit more, say 50, thousand years.
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How Do Scientists Determine the Age of Dinosaur Bones?

Carbon dating rocks
Carbon dating rocks
Carbon dating rocks
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How Do Scientists Determine the Age of Dinosaur Bones? | HowStuffWorks

Geologists do NOT date rocks with carbon dating. Radiocarbon is only used to date materials with organic matter in them and is only good for things younger than about 50, years old. Prior to radiometric dating geologists tried to use sedimentary deposition rates to get an estimate of the age of rocks in years absolute dating. Other methods were also tried. They was a wide variety in the ages estiamted from these methods. They also as others have pointed out used "relative dating" - what's older than what. They used "Steno's Laws": 1 principle of original horizontality sedimentary rock are originally laid down in a near horizontal fashion , 2 Principle of superposition in a layered sequence, the top rocks are the youngest and the bottom rocks are the oldest , and 3 cross-cutting relations if something like a fault or an igneous intrusion cuts across a body of rock, the body of rock is older because it had to exist for the feature to cut across it.
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Carbon dating rocks

Last Updated: July 1, References. This article was co-authored by our trained team of editors and researchers who validated it for accuracy and comprehensiveness. This article has been viewed 6, times. Learn more
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When paleontologist Mary Schweitzer found soft tissue in a Tyrannosaurus rex fossil , her discovery raised an obvious question -- how the tissue could have survived so long? The bone was 68 million years old, and conventional wisdom about fossilization is that all soft tissue, from blood to brains , decomposes. Only hard parts, like bones and teeth, can become fossils.
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