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This is an informational tour in which students gain a basic understanding of geologic time, the evidence for events in Earth’s history, relative and absolute dating techniques, and the significance of the Geologic Time Scale.Based on a discipline of geology called stratigraphy, rock layers are used to decipher the sequence of historical geological events.It is the only method that can be used to date rocks, pottery and minerals for dates that are approximately between 300 to 10,000 years old.This method is based on the fact that when a material is heated or exposed to sunlight, electrons are released and some of them are trapped inside the item.
The first method was based on radioactive elements whose property of decay occurs at a constant rate, known as the half-life of the isotope.
Today, many different radioactive elements have been used, but the most famous absolute dating method is radiocarbon dating, which uses the isotope C.
The isotope of Potassium-40, which has a half-life of 1.25 Billion years, can be used for such long measurements.
Another absolute dating method is thermoluminescence, which dates the last time an item was heated.
Relative techniques can determine the sequence of events but not the precise date of an event, making these methods unreliable.
b) Absolute These methods are based on calculating the date of artefacts in a more precise way using different attributes of materials.