How are igneous rocks used in relative dating of rock layers

Notice that the red line runs along under the tan mud layer and up over the land surface underneath the landslide deposit. The principle of faunal succession is based on the appearance of fossils in sedimentary rocks. For example, in sedimentary rocks, it is common for gravel from an older formation to be ripped up and included in a newer layer. This principle allows sedimentary layers to be viewed as a form of vertical time line, a partial or complete record of the time elapsed from deposition of the lowest layer to deposition of the highest bed. The principle of intrusive relationships concerns crosscutting intrusions. There are exceptions to the law for example, layers deposited on a steeply inclined surfacebut they are relatively few and will not be considered. As the geologic ranges of species are adjusted, the geologic ranges of fossil assemblages are also revised.

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Note that the use of primary structures to determine tops and bottoms of layers assumes that the contention that 'the present is the key to the past' is valid.

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Relative dating

Another primary structure that may be used to determine 'tops' and 'bottoms' of layers is the tilt or lack of tilt of the layers. There are exceptions to the law for example, layers deposited on a steeply inclined surfacebut they are relatively few and will not be considered. Essentially, this law states that clasts in a rock are older than the rock itself. The law of included fragments is a method of relative dating in geology. The geologist notes that the sequence and characteristics thickness, color, texture, mineralogy of the layers in the three outcrops are the same.

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