Start Who uses radiometric dating

Who uses radiometric dating

While a human life spans decades, the Earth's history spans 4.6 billion years!

The formula below is a proper model that admits the possibility that some daughter isotope was present when the rock formed: where D is the amount of daughter isotope present at start.

It wasn't until the advent of radiometric dating techniques in the middle 1900s that reliable dates could be assigned to the previously named geologic time divisions.

The National Park System contains a magnificent record of geologic time because rocks from each period of the geologic time scale are preserved in park landscapes.

But if there was argon in the rock when it originally formed, then the age calculated will be millions of years too high. The greater the amount of daughter isotope, the greater the apparent age.