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NJ Gov. Christie Vetoes Gay Marriage Bill
TheRealThing Wrote:Paleoarcheologists went out and dug these footprint sites up. Unlike the fantasy finds of the evolutionist that supposedly support transitory life forms in the fossil record. And are in fact, 1% actual fossil material and 99% biased conjecture. These footprints can actually be studied and photographed.

They can't really date fossils. All they can do is carbon date rock around them. Remember Krakatoa? The vocanic island that emerged from under the waves between Java and Sumatra in 1883? Hundreds of scientists were on hand in sailing crafts to observe the event so we know Krakatoa was in fact born in 1883. The volcanic rock of Krakatoa was later carbon dated, the test came back showing the rocks of Krakatoa to be 168,000 years old. Nobody knows when the dinosaurs went extinct.
Another falsehood. Scientists can carbon date anything that is carbon based, and takes in carbon, that includes any living thing, plus their bones and fossils. You can only carbon date stuff back as far as 60,000 years, because after that time the carbon is gone. Anything can be dated once they figure out what's in it, because they know the half-life(the amount of time it takes something decaying to decrease by half) of different radioactive elements. There are several other isotopes that scientist use that have a much longer half-life. They taught us about the half life of Uranium when they were putting us through the class to work the nuclear power plants, so they could explain how long it would take a certain amount of radiation we receive there to leave our body. That same half life is how they date things. Dating objects today is almost 100% exact, but that is a science that creationist will discredit. BTW, I heard that "dating the rocks around fossils" stuff when I was doing "biblical studies", and that is why your post stuck out to me just now as I re-read it. Creationist always say that scientists can only date the rocks around the fossils. It is a tell tell sign that someone is reading creationist articles. It is also a tell tell sign that so called "creation scientists" don't have a clue.



Quote:Dating a Fossil
As soon as a living organism dies, it stops taking in new carbon. The ratio of carbon-12 to carbon-14 at the moment of death is the same as every other living thing, but the carbon-14 decays and is not replaced. The carbon-14 decays with its half-life of 5,700 years, while the amount of carbon-12 remains constant in the sample. By looking at the ratio of carbon-12 to carbon-14 in the sample and comparing it to the ratio in a living organism, it is possible to determine the age of a formerly living thing fairly precisely.
A formula to calculate how old a sample is by carbon-14 dating is:
t = [ ln (Nf/No) / (-0.693) ] x t1/2
t = [ ln (Nf/No) / (-0.693) ] x t1/2
where ln is the natural logarithm, Nf/No is the percent of carbon-14 in the sample compared to the amount in living tissue, and t1/2 is the half-life of carbon-14 (5,700 years).
So, if you had a fossil that had 10 percent carbon-14 compared to a living sample, then that fossil would be:
t = [ ln (0.10) / (-0.693) ] x 5,700 years
t = [ (-2.303) / (-0.693) ] x 5,700 years
t = [ 3.323 ] x 5,700 years
t = 18,940 years old
Because the half-life of carbon-14 is 5,700 years, it is only reliable for dating objects up to about 60,000 years old. However, the principle of carbon-14 dating applies to other isotopes as well. Potassium-40 is another radioactive element naturally found in your body and has a half-life of 1.3 billion years. Other useful radioisotopes for radioactive dating include Uranium -235 (half-life = 704 million years), Uranium -238 (half-life = 4.5 billion years), Thorium-232 (half-life = 14 billion years) and Rubidium-87 (half-life = 49 billion years).
The use of various radioisotopes allows the dating of biological and geological samples with a high degree of accuracy. However, radioisotope dating may not work so well in the future. Anything that dies after the 1940s, when Nuclear bombs, nuclear reactors and open-air nuclear tests started changing things, will be harder to date precisely.


http://science.howstuffworks.com/environ...on-142.htm
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NJ Gov. Christie Vetoes Gay Marriage Bill - by TheRealVille - 02-22-2012, 05:16 PM

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