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He also found that certain animals were in only certain layers and that they were in the same layers all across England.

Due to that discovery, Smith was able to recognize the order that the rocks were formed.

While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.

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

The lesson starts with a brief introduction into dating techniques, eventually flowing into a distinction between relative and absolute dating (which will be discussed again later in the unit).Igneous intrusions are sometimes referred to as a seperate principle, the Hutton’s theory of uniformatarianism and the principles of stratigraphy would be fully developed and made popular by another Scottish geologist Charles Lyell (1797-1875) with his classic three volume work, first published from 1830 to 1833, entitled The science of stratigraphy changed humans’ view of the world from one, which was static to one that was dynamic and changing.Not only did the rock layers indicate changing environments they also revealed that different life forms have existed in different times.Playfair later commented that, "the mind seemed to grow giddy by looking so far into the abyss of time." Mc Phee (1998) points out that Hutton removed humans from a specious place in time just as Copernicus had removed humans from a specious position in the universe (p. Hutton gives us three more laws to consider when seeking relative dates for rock layers, one of which, the law of inclusions was described earlier.states any feature that cuts across a rock or sediment must be younger than the rock or sediment through which it cuts.Examples include fractures, faults, and igneous intrusions.

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