Carbon dating dinosaur bones wiki
It is calibrated by C14 dating, and the ages given by the two methods are in close agreement after such calibration.Accessed 2017 May 20" href="#footnote9_naj91gk"9 In millions of years, there would certainly be roughly equal numbers of D and L forms, so that the ratio of D to L would be one.Accessed " href="#footnote1_cs8c0g9"1 The half-life of C14 is 5730 years, although there are subtleties about how C14 ages are actually computed.That means that in 5730 years, half of the C14 will decay to nitrogen 14.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.
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.
In a 2015 paper in , her group reported isolating fragments of eight other proteins from fossils of dinosaurs and extinct birds, including hemoglobin in blood, the cytoskeletal protein actin, and histones that help package DNA. All amino acids except glycine (the simplest one) are optically active, having a stereocenter at their α-C atom.
This means that the amino acid can have two different configurations, “D” or “L” which are mirror images of each other.
Here are more quotations from the Science article referenced above: 6 , Schweitzer, her postdoc Elena Schroeter, and colleagues report that they did a complete makeover of their 2009 experiment to rule out any possible contamination. Schroeter even went so far as to break down the mass spectrometer piece by piece, soak the whole thing in methanol to remove any possible contaminants, and reassemble the machine. Just how those collagen sequences survived for tens of millions of years is not clear.
“About the only thing that is the same [as the 2009 experiments] is the dinosaur,” Schweitzer says. Meanwhile, Schweitzer’s team is going beyond collagen.
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This is still a large number of C14 atoms, and they had to come from somewhere!