Question

use the image to answer the questions about fossils.
fossil images
5 which fossil would make the best index
fossil?
a crinoid
b coral
c ammonite
d trilobite

Explanation:

An index fossil is widespread geographically, existed for a short time, and is abundant. Ammonites (option C) had a short geological range and wide distribution, making them ideal. Crinoids, corals, and trilobites either existed longer or are less useful for precise dating.

Answer:

C. ammonite