- Considering Contamination
- Reports of living pterosaurs
- How Do Scientists Determine the Age of Dinosaur Bones?
- Carbon 14, Radiometric Dating, Unfossilized Dinosaur Bones, not millions of years old
Dinosaur bones, on the other hand, are millions of years old -- some fossils are billions of years old. To determine the ages of these specimens, scientists need an isotope with a very long half-life. Some of the isotopes used for this purpose are uranium, uranium and potassium , each of which has a half-life of more than a million years. Unfortunately, these elements don't exist in dinosaur fossils themselves.
Each of them typically exists in igneous rock, or rock made from cooled magma. Fossils, however, form in sedimentary rock -- sediment quickly covers a dinosaur's body, and the sediment and the bones gradually turn into rock. But this sediment doesn't typically include the necessary isotopes in measurable amounts.
Fossils can't form in the igneous rock that usually does contain the isotopes.
Reports of living pterosaurs
The extreme temperatures of the magma would just destroy the bones. So to determine the age of sedimentary rock layers, researchers first have to find neighboring layers of Earth that include igneous rock, such as volcanic ash. One method is similar to Carbon14 dating in that it looks at ratios of isotopes that decay. Potassium40 to Argon40 has a much much longer half-life than Carbon14 to Carbon12 — ,, years.
- How we date dinosaur bones - Rosie Research.
- How do we date dinosaur bones?;
- How Do Scientists Determine the Age of Dinosaur Bones? | HowStuffWorks;
- How we date dinosaur bones?
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- What exactly are we dating here? Sample contamination and general trustworthyness.
If we want to use this method we will need to find out how much Potassium40 and Argon40 is in our dinosaur fossil sample. This can be tricky, and in fact, we use one technique on potassium and another technique on argon. When it comes to potassium we can burn it and look at the colors of light emitted.
Every element has a very specific set of colors, and we can pull out potassiums fingerprint and thus the quantity from an overall data set. Argon40, on the other hand, uses the same technique we learned about in our other STEM lab for kids — mass spectrometry.
And, indeed, in this lab, we will run pennies and nickels through our mass spectrometer, look at the data, and determine how old dinosaur fossils are that we dug up. Another method of dating dinosaur bones is looking at the geologic layers dug up when finding the fossils, a method called geochronology. As time goes on, sediment accumulates over the lands.
This sediment can turn into limestone, shale, and other types of rock.
How Do Scientists Determine the Age of Dinosaur Bones?
Open discussion, with details, makes for an atmosphere where the truth may come into open view. So why did two chairmen of the Western Pacific Geophysics Meeting in Singapore delete one of the oral-presentation reports from their official website? They gave no warning to the Paleochronology group. The whole report was just deleted from public view, with no online explanation. Notice the absence of report number five in the above image from the official conference web site. The Paleochronology group asked for an explanation; they were given the following:.
No explanation is given by these two chairmen. Science, meaning real science, thrives in details.
Carbon 14, Radiometric Dating, Unfossilized Dinosaur Bones, not millions of years old
Raw censorship in this deletion of an abstract—that deserves an investigation. Typical error potential listed for the above C testing is only a few centuries but sometimes even less than one century. Notice how greatly the above data vary from the millions-of-years figures commonly proclaimed in Western media and textbooks.
Radiocarbon dating of dinosaur fossils has generally not been done until recent years, for the great majority of scientists had assumed such testing would be pointless.
Carbon should not exist in dinosaur bones, for it should have decayed away millions of years ago. But that idea comes from the assumption that those creatures actually lived millions of years ago, an assumption now challenged by other scientists.