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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.

As he continued his job as a surveyor, he found the same patterns across England.Observation of modern marine and non-marine sediments in a wide variety of environments supports this generalization (although cross-bedding is inclined, the overall orientation of cross-bedded units is horizontal).The law of superposition states that a sedimentary rock layer in a tectonically undisturbed sequence is younger than the one beneath it and older than the one above it.A fundamental principle of geology advanced by the 18th century Scottish physician and geologist James Hutton, is that "the present is the key to the past." In Hutton's words: "the past history of our globe must be explained by what can be seen to be happening now." The principle of intrusive relationships concerns crosscutting intrusions.In geology, when an igneous intrusion cuts across a formation of sedimentary rock, it can be determined that the igneous intrusion is younger than the sedimentary rock.

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