Radiometric dating stuff works

05-Nov-2019 06:15 by 10 Comments

Radiometric dating stuff works

Layers of rock are deposited horizontally at the bottom of a lake (principle of original horizontality).

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

A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.

However, by itself a fossil has little meaning unless it is placed within some context.

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.

For example, in the rocks exposed in the walls of the Grand Canyon (Figure 1) there are many horizontal layers, which are called strata.

The study of strata is called stratigraphy, and using a few basic principles, it is possible to work out the relative ages of rocks.

Just as when they were deposited, the strata are mostly horizontal (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).

In the Grand Canyon, the layers of strata are nearly horizontal.

These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.

As these changes have occurred, organisms have evolved, and remnants of some have been preserved as fossils.

" First, the relative age of a fossil can be determined.

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    Igneous or metamorphic rocks have the lowest primary porosity because they commonly form at depth and have interlocking crystals.