7 special fossils that indicate to geologists the boundaries of geological tie. a index fossils b trace…

7 special fossils that indicate to geologists the boundaries of geological tie. a index fossils b trace fossils

7 special fossils that indicate to geologists the boundaries of geological tie. a index fossils b trace fossils

Answer

Brief Explanations:

Index fossils are used by geologists to mark geological time - scale boundaries due to their short - lived and widespread nature. Trace fossils are signs of ancient organism activity and not used for time - scale boundaries in the same way.

Answer:

A. index fossils