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Due to that discovery, Smith was able to recognize the order that the rocks were formed.Sixteen years after his discovery, he published a geological map of England showing the rocks of different geologic time eras.Photo from Glen Canyon National Recreation Area, Utah.

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The principle of Uniformitarianism states that the geologic processes observed in operation that modify the Earth's crust at present have worked in much the same way over geologic time.

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.

THE MORE STABLE FORM IT TURNS INTO IS CALLED THE DAUGHTER ELEMENT.

The Permian through Jurassic stratigraphy of the Colorado Plateau area of southeastern Utah is a great example of Original Horizontality and the Law of Superposition, two important ideas used in relative dating.

Relative dating by biostratigraphy is the preferred method in paleontology and is, in some respects, more accurate.

The Law of Superposition, which states that older layers will be deeper in a site than more recent layers, was the summary outcome of 'relative dating' as observed in geology from the 17th century to the early 20th century.Because of the alternation between dark and light sediments we can use each dark band as a marker for one year.For really old dates we need to use radioactive isotopes.The first method of finding the absolute age of an object is by examining tree rings.If we looked at a cross-section ofa tree or log we would notice that all through it are concentric circles radiating out from the center to the bark. Each ring is also different, and the thickness of each ring is representative of the length of the growing season.As he continued his job as a surveyor, he found the same patterns across England.

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