speed dating slc ut - Relative age dating sequence

Because of cross-cutting relationships, the cut that divides the slice from the rest of the loaf is younger than the loaf itself (the loaf had to exist before it could be cut).When investigating rocks in the field, geologists commonly observe features such as igneous intrusions or faults that cut through other rocks.Correlation can involve matching an undated rock with a dated one at another location.

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The image below shows a sequence of Devonian-aged (~380 Ma) rocks exposed at the magnificent waterfall at Taughannock Falls State Park in central New York.

The rocks near the bottom of the waterfall were deposited first and the rocks above are subsequently younger and younger. This work is licensed under a Creative Commons Attribution-Share Alike 4.0 International License.

Fossils are important for working out the relative ages of sedimentary rocks.

Throughout the history of life, different organisms have appeared, flourished and become extinct.

The method of reading the order is called stratigraphy (layers of rock are called strata).

Relative dating does not provide actual numerical dates for the rocks.

This matching process is called correlation, which has been an important process in constructing geological timescales.

Some fossils, called index fossils, are particularly useful in correlating rocks.

You can see that the curb is offset: the bottom half does not line up with the top half.

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