Start Define relative dating of fossils

Define relative dating of fossils

The flora and fauna at the end of the Mesozoic Era would have seemed alien since most of the plants and animals that are familiar to us had not yet evolved.

Wind and water erode strata and some areas are uplifted or even tilted.

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Most animal species flourished and became extinct long before the first monkeys and their prosimian ancestors evolved.

For instance, if we find a fossil bone below the strata 3 rock level shown above, we assume that the animal most likely lived at a time before that layer was formed.

However, we must be careful to note whether or not the fossil comes from the mixed strata zone of the filled in hole..

These processes result in All of these processes confuse the stratigraphic record.

In many cases, however, it is possible to reconstruct the original sequence of strata so that they can be used for relative dating.

Sedimentary rocks are rarely useful for dating because they are made up of bits of older rocks.