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Unfossilized tissue of a mosasaur bone from the Maastrichtian Phosphatic Chalk of Ciply, Belgium was carbon dated to an 'age' of 24,600 years BP. The “chronostratigraphic unit” is the name assigned to the layer of rock.
Absolute age dating is like saying you are 15 years old and your grandfather is 77 years old.
To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.
Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.
Relative age dating also means paying attention to crosscutting relationships.