Guide fossils are most useful because they ____.
A) occur over a small geographic area
B) occur over a brief time interval
C) are difficult to identify
D) occur over a long period of time
E) occur in all rock types

Question

Quizplus · Accepted Answer

Guide fossils are most useful when they occur over a brief time interval, as they can be used to date and correlate layers of rock within that interval. This is because the guide fossil is uniquely characteristic of that particular time period and can be used to recognize that interval in different geographic areas.

Guide Fossils Are Most Useful Because They ____