Age earth dating
The methods are all ultimately calibrated to relative dates of the geologic column, such that data that conflicts with a fossil's or rock's placement in the geologic column is explained away by the evolutionary theoretical system.
For example, Carbon-14 would decay to nothing in well under 1 million years, so if Carbon-14 is found in a dinosaur fossil it is interpreted as resulting from contamination.
The theory is that when zircons crystallize they lose all of their lead and as long as the crystal remains closed its lead/uranium ratios should follow a predictable trend.
It is from this field of study that fossils and artifacts are dated based on the perceived age of the geological layers in which they are located.
Geologists determine the age of rocks, fossils, and sediments using a variety of methods including relative and absolute dating.
As the parent decays to daughter, the ratios change and the straight line remains but becomes angled.
The slope of the line equals the number of half-lives the parent isotope has passed since solidification.