What are fossils organisms that existed over a wide area but only a limited time period called

Answer:-

Index Fossils

Explanation:-

Index fossils are fossils that are preserved in the rock record and are characteristic for a particular geological time period.

Index fossils have a wide distribution geographically and is easily identifiable. But they were there for only a small time period. Hence they are often used to define geological time frames and relate strata datas.

Index fossils are thus fossils organisms that existed over a wide area but only a limited time period

The fossils of organisms that were widely distributed but only lived during a shorter period of time are called index fossils.