Carbon 14 and potassium argon dating methods

Relative dating makes use of the common sense principle that in a deposition of layers.Prior to 1905 the best and most accepted age of the Earth was that proposed by Lord Kelvin based on the amount of time necessary for the Earth to cool to its present temperature from a completely liquid state.The object's approximate age can then be figured out using the known rate of decay of the isotope.

There are many methods employed by these scientists, interested in the old, to get to know the age of items.

It is possible to tell the number of years ago a particular rock or archeological site had been formed.

Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.

The latest high-tech equipment permits reliable results to be obtained even with microscopic samples.

Radiometric dating is self-checking, because the data (after certain preliminary calculations are made) are fitted to a straight line (an "isochron") by means of standard linear regression methods of statistics.