The half-life of C is approximately 5730 years, which is too short for this method to be used to date material millions of years old.The isotope of Potassium-40, which has a half-life of 1.25 Billion years, can be used for such long measurements.Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological events.Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable.Archaeologists use many different techniques to determine the age of a particular artifact, site, or part of a site.Two broad categories of dating or chronometric techniques that archaeologists use are called relative and absolute dating.A small number of objects found on excavations contain references to historical figures. Coins are perhaps the most widely known of historically dateable objects.Most are stamped with the head of the current ruler.
The basis for stratigraphy seems quite intuitive today, but its applications were no less than earth-shattering to archaeological theory.
b) Absolute These methods are based on calculating the date of artefacts in a more precise way using different attributes of materials.
This method includes carbon dating and thermoluminescence.
All of us tend to use the most significant dates in our lives as reference points for all the others.
For example, we think of our age in reference to the year we were born, and while we may give names to wedding anniversaries (silver, gold, etc.), we determine them by counting from the year of the marriage.