Absolute dating of fossils definition
An index fossil is a fossil representing a plant or animal that existed for a relatively short duration of time.
These are the fossils that we want to use for relative dating.
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.
Some of the scientists' favorite index fossils are trilobites, ammonites and scallop shells.
So, how exactly is an index fossil used for relative dating of rocks?
He worked in Southern England, and he got to see all kinds of different rock strata that were exposed in outcrops and canals.