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To determine the relative age of different rocks, geologists start with the assumption that unless something has happened, in a sequence of sedimentary rock layers, the newer rock layers will be on top of older ones. This rule is common sense, but it serves as a powerful reference point.

Geologists draw on it and other basic principles ( to determine the relative ages of rocks or features such as faults.

Relative age dating also means paying attention to crosscutting relationships.

Say for example that a volcanic dike, or a fault, cuts across several sedimentary layers, or maybe through another volcanic rock type.

This result demonstrates that the mandible is the oldest hominin fossil reported to date from central and northern Europe and raises questions concerning the phyletic relationship of ” fossils from Trinil in Java, the Mauer jaw is one of the classic finds of paleoanthropology.

It was found on October 21, 1907, at a depth of 24 m in the Grafenrain sand pit, resting in fluvial sediments named the “Mauer sands” (1).

Here is an easy-to understand analogy for your students: relative age dating is like saying that your grandfather is older than you.

The fossil is an important key to understanding early human occupation of Europe north of the Alps.

There's a small amount of radioactive carbon-14 in all living organisms.

When they die no new carbon-14 is taken in by the dead organism.

The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out.

Learn about different types of radiometric dating, such as carbon dating.

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