Which of the following would make the best index fossil: olenellus (522-510 million years ago), flexicalymene (~490-418 million years ago), and phacops (~418-360 million years ago).
A)Olenellus
B)Flexicalymene
C)Phacops

Question

Quizplus · Accepted Answer

Olenellus makes the best index fossil because it lived during a relatively short, specific time period (522-510 million years ago), which helps geologists date the rock layers in which it is found more accurately.

Which of the Following Would Make the Best Index Fossil