What are index fossils and how are they used for relative dating

A little about the video
The Age of Dinosaurs was so many millions of years ago that it is very difficult to date exactly. Scientists use two kinds of dating techniques to work out the age of rocks and fossils. The first method is called relative dating. This considers the positions of the different rocks in sequence in relation to each other and the different types of fossil that are found in them. The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks.
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How are index fossils used to determine the age of fossils or rock layers?

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What is the difference between absolute age and relative age of fossils? | Socratic

Relative dating is used to arrange geological events, and the rocks they leave behind, in a sequence. The method of reading the order is called stratigraphy layers of rock are called strata. Relative dating does not provide actual numerical dates for the rocks. Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles:.
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How are index fossils used in relative dating?

Index fossils. Index fossils can be used to help determine the relative age of rock layers. Index fossils are from species that only existed for a short time.
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