Dating a prehistoric find

29-Mar-2020 12:02

dating a prehistoric find-10

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Layers that cut across other layers are younger than the layers they cut through (principle of cross-cutting relationships).

The principle of superposition builds on the principle of original horizontality.

The layers of rock at the base of the canyon were deposited first, and are thus older than the layers of rock exposed at the top (principle of superposition).

Accordingly, the oldest rocks in a sequence are at the bottom and the youngest rocks are at the top.

Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.

Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.

This is the principle of original horizontality: layers of strata are deposited horizontally or nearly horizontally (Figure 2).

Thus, any deformations of strata (Figures 2 and 3) must have occurred after the rock was deposited.

Geologists have established a set of principles that can be applied to sedimentary and volcanic rocks that are exposed at the Earth's surface to determine the relative ages of geological events preserved in the rock record.

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