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Our understanding of the shape and pattern of the history of life depends on the accuracy of fossils and dating methods.

Some critics, particularly religious fundamentalists, argue that neither fossils nor dating can be trusted, and that their interpretations are better.

Students not only want to know how old a fossil is, but they want to know how that age was determined.

Some very straightforward principles are used to determine the age of fossils.

Watch this video to find out how we use index fossils to establish the relative ages of rocks.

In previous lessons, we talked about the Geologic Time Scale and how scientists use it to piece together the history of the earth.

In the past 150 years they have not found any fossils that Darwin would not have expected.

One outcrop shows layers from one geologic time period, while the other outcrop represents a different time. Can he put the pieces together to make the story more complete? Let's find out how scientists deal with this common problem by using the fossils inside the rocks.

Back in 1793, there lived a land surveyor named William Smith.

The observation that certain fossils were associated with certain rock strata led early geologists to recognize a geological timescale in the 19th century.

The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of the various strata and thereby the included fossils.

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