Ammonoids, graptolites, and conodonts are excellent guide fossils because of their short stratigraphic ranges and wide geographic ranges.

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Ammonoids, graptolites, and conodonts all have short-lived existence in the geologic record, making them excellent guide fossils to help determine the relative ages of rocks in different locations. Additionally, their remains can be found around the world, further contributing to their usefulness as index fossils.

Ammonoids, Graptolites, and Conodonts Are Excellent Guide Fossils Because of Their