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Relative age and relative dating

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The base layer must come first, then the second and then the third.

So I can say the second layer is younger than the first and older than the third but I have no idea whether the cake is 5 minutes or 5 million years old.

The age of the fossil must be determined so it can be compared to other fossil species from the same time period.

Understanding the ages of related fossil species helps scientists piece together the evolutionary history of a group of organisms.

In each period of earth's history different fauna and flora evolved with similar faunas being characteristic of similar beds.

The diagram right shows two distinct faunal assemblages.

However, by itself a fossil has little meaning unless it is placed within some context.

Sometimes beds of rock can turn over the other way, so be very cautious when relatively dating rocks!

The most obvious feature of sedimentary rock is its layering.

Making this processes even more difficult is the fact that due to plate tectonics some rock layers have been uplifted into mountains and eroded while others have subsided to form basins and be buried by younger sediments.

With out individual time stamps the process of dating these structures could become extremely difficult.