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

Due to that discovery, Smith was able to recognize the order that the rocks were formed.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.Relative dating by biostratigraphy is the preferred method in paleontology and is, in some respects, more accurate.The principle of inclusions and components explains that, with sedimentary rocks, if inclusions (or clasts) are found in a formation, then the inclusions must be older than the formation that contains them.For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer.

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