Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation. Index fossils are fossils that are known to only occur within a very specific age range.

What type of dating uses index fossils?

Radiometric dating Radiometric dating and index fossils are two methods we can use to figure out how old fossil-containing chunks and layers of rock are.

Are index fossils used for relative or absolute dating?

Now we have a more complete piece of geologic history: a piece that says the trilobite layer is the oldest, the ammonite layer is the youngest and the scallop rock layer is somewhere in between. Index fossils can be used to correlate the relative ages of rocks that are separated by vast distances.

What type of dating do rock layers and index fossils provide?

relative dating By correlating fossils from various parts of the world, scientists are able to give relative ages to particular strata. This is called relative dating. Relative dating tells scientists if a rock layer is older or younger than another.

What is the difference between fossils and index fossils?

A fossil is any remains of ancient life. Fossils can be body fossils, which are remains of the organism itself or trace fossils, such as burrows, tracks, or other evidence of activity. Index fossils are fossils that are widespread but only existed for a short period of time.