GEOL 1010 Chapter Notes - Chapter 9: Atomic Number, Beta Particle, Nonconformist
4 Oct 2018
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Relative dates are when we place rocks in their proper sequence of formation (order, rock a was formed first, rock b was formed second etc. ) Law of superposition states that the oldest layer of sedimentary rocks is older than the one above it, and younger than the one below it (youngest on top, oldest on bottom). The principle of original horizontality states that if a rock layer is flat, it has not been disturbed. The principle of lateral continuity refers to the fact that sedimentary beds originate as continuous layers that extend in all directions until they eventually grade into a different type of sediment (google this later their def makes no sense) The principle of cross-cutting relationships states that geologic features that cut across rocks must form after the rocks they cut through (igneous intrusions). Inclusions are fragments of one rock unit that have been enclosed within another.
