The premise behind relative dating is

21 Feb

The pictures I have taken show very good examples of this.

By using the principle of superposition we can know that the layers toward the bottom are older than the layers toward the top.

Both the principle of original horizontality and the law of superposition seem very intuitive and obvious, but they weren’t proposed until the 1600s, both by Danish anatomist, geologist, and priest Nicolaus Steno (1636–1686).

In a nice, simple world, we would have a complete and undisturbed record of sedimentary rocks to help us plot out Earth’s past. All kinds of things happen to rock layers after they form.

Carbon dating is used to determine the age of biological artifacts up to 50,000 years old.

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The principle of superposition is defined as in the environment of an undisturbed layer of sedimentary rocks; the layers on the bottom are older than the layers towards the top.

The rock body shown in the pictures attached, started out as one layer, as millions and millions of years passed more layers of sedimentary rock were placed on top of each other one after another, each layer was deposited at a later time than the one before it.

The youngest layer is on the top, and the oldest layer is on the bottom.

Carbon-14 cannot be used to date biological artifacts of organisms that did not get their carbon dioxide from the air.

This rules out carbon dating for most aquatic organisms, because they often obtain at least some of their carbon from dissolved carbonate rock.