The difference between relative and absolute dating

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.

Third, magnetism in rocks can be used to estimate the age of a fossil site.

This method uses the orientation of the Earth's magnetic field, which has changed through time, to determine ages for fossils and rocks.

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

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