1.) Absolute dating----- the process of determining of an age of a specified time scale in archeology and geology.. It provides a numerical age or range in contrast with relative dating which place events in order without any measure of the age between events..

2.)Radiocarbon dating -----this a method that provides objective age estimate for carbon-based materials that originated from living organisms.. An age could be estimated by measuring the amount of carbon.

3.)Index Fossils----