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A similar situation with igneous rocks occurs when xenoliths are found.These foreign bodies are picked up as magma or lava flows, and are incorporated, later to cool in the matrix.From top to bottom: Rounded tan domes of the Navajo Sandstone, layered red Kayenta Formation, cliff-forming, vertically jointed, red Wingate Sandstone, slope-forming, purplish Chinle Formation, layered, lighter-red Moenkopi Formation, and white, layered Cutler Formation sandstone.Photo from Glen Canyon National Recreation Area, Utah.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.
Due to that discovery, Smith was able to recognize the order that the rocks were formed.
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.
This is because it is not possible for a younger layer to slip beneath a layer previously deposited.
The only disturbance that the layers experience is bioturbation, in which animals and/or plants move things in the layers.
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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.