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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.
While digging the Somerset Coal Canal in southwest England, he found that fossils were always in the same order in the rock layers.
These strata make up much of the famous prominent rock formations in widely spaced protected areas such as Capitol Reef National Park and Canyonlands National Park.
however, this process is not enough to allow the layers to change their positions.