For example, a scientists will be able to say Layer A is older than Layer B, and Layer C cuts across Layer A; therefore, Layer C must be younger than A.
The example used here contrasts sharply with the way conventional scientific dating methods are characterized by some critics (for example, refer to discussion in "Common Creationist Criticisms of Mainstream Dating Methods" in the Age of the Earth FAQ and Isochron Dating FAQ).
A common form of criticism is to cite geologically complicated situations where the application of radiometric dating is very challenging.
Geologists can employ two basic methods to dating rocks and fossils.
Relative and absolute geologic dating practices have their strengths and weaknesses, which are inherent to their process.
Relative dating simply orders stratigraphic units, or layers of rock, from oldest to youngest.