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31-May-2019 18:33

Sixteen years after his discovery, he published a geological map of England showing the rocks of different geologic time eras.

Methods for relative dating were developed when geology first emerged as a natural science in the 18th century.

There are a number of different types of intrusions, including stocks, laccoliths, batholiths, sills and dikes.

Cross-cutting relations can be used to determine the relative ages of rock strata and other geological structures.

Any observable tilting or swirling is due to disruption of the process. Material that intrudes or cuts into a horizontal bed is assumed to be younger than the material that is disrupted.

Consider a lake that dries out or somehow contains older sediments that are washed into it.

In another 5,730 years half of that amount will remain, and so on.

As he continued his job as a surveyor, he found the same patterns across England.

Though relative dating can only determine the sequential order in which a series of events occurred, not when they occurred, it remains a useful technique.