3 rules of relative dating


13-Oct-2019 19:13

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.

The principle of cross-cutting relationships pertains to the formation of faults and the age of the sequences through which they cut.

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.

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



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