Absolute dating places events or rocks at a specific time.
If a geologist claims to be younger than his or her co-worker, that is a relative age.
Geochronology is the science of dating and determining the time sequence of events in the history of the Earth.
Geologic research and mapping requires the determinations of the ages and composition of rocks.
A geologic map or report typically is only a summary of investigations that frequently involve the collecting and processing of hundreds of rock samples, followed by the evaluation and interpretation of data from a variety of analytical techniques.
Different ways to correlate: -Physical continuity- can physically trace a rock unit from one area to another.
-Similarity of rock type- 2 rocks similar from different places, may be the same.