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23-Aug-2016 20:54

For example, geologists measured how fast streams deposited sediment, in order to try to calculate how long the stream had been in existence.Not surprisingly, these methods resulted in wildly different estimates, from a few million years to "quadrillions of years".Another example of yearly layers is the deposition of sediments in lakes, especially the lakes that are located at the end of glaciers.Rapid melting of the glacier in the summer results in a thick, sandy deposit of sediment.Droughts and other variations in the climate make the tree grow slower or faster than normal, which shows up in the widths of the tree rings.These tree ring variations will appear in all trees growing in a certain region, so scientists can match up the growth rings of living and dead trees.

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In other words, you can use superposition to tell you that one rock layer is older than another.

For example, an especially warm summer might result in a very thick layer of sediment deposited from the melting glacier.