Relative dating in geology definition
And when we put both absolute and relative time together, we create a geologic time scale that puts all these events in perspective. are layered in their relative order from oldest at the bottom to most recent at the top, and we also see how much absolute time each one spans.For example, if we look at the scale, we see that the Paleozoic Era comes before the Mesozoic Era, relatively speaking, and that it spans about 290 million years, starting about 542 million years ago and ending about 251 million years ago.
Numerical dating determines the actual ages of rocks through the study of radioactive decay.
We get these rock dates and ages with radiometric dating techniques that tell us how old rocks are based on their rate of decay.
Relative time, also called chronostratic time tells us when events occurred relative to each other.
For example, instead of pm we might say 'lunch time.' There is no definitive time for lunch, except that it occurs between breakfast and dinner.
So relative to the other meals, it falls in the middle and is later than breakfast yet earlier than dinner.