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But this means that we can now use the fossil species to date the sedimentary rocks in which it is found; and we can say that those fossils found in the same strata as this species must be the same age; those species which stratigraphy tells us are older than it is must be more than 16 million years old; and those species which stratigraphy tells us are younger than it is must be less than 14 million years old.

Hence we can use datable rocks to put dates on fossil species; and then we can use the fossil species to put dates on other rocks which would otherwise be difficult to date.

Let's find out more about these geological dating methods in order to understand how Paul the Paleontologist can be so sure about the age of his dinosaur fossils.

C) dating usually want to know about the radiometric[1] dating methods that are claimed to give millions and billions of years—carbon dating can only give thousands of years.

The two main types of dating methods are relative and absolute.

Relative dating methods are used to determine only if one sample is older or younger than another.

One rare form has atoms that are 14 times as heavy as hydrogen atoms: carbon-14, or C ratio gets smaller.

We will deal with carbon dating first and then with the other dating methods.

Those fossils we have described as "index fossils" are particularly suitable for this purpose, since they have a wide geographical distribution but only inhabit a thin slice of time.

Learn how scientists determine the ages of rocks and fossils.

Absolute dating methods are used to determine an actual date in years for the age of an object.

Before the advent of absolute dating methods in the twentieth century, nearly all dating was relative.