Answer:
TRUE
Step-by-step explanation:
Fossils are defined as the remains of ancient flora and fauna that were deposited about millions of years back. These fossils are found to be embedded in the sedimentary type of rocks.
These fossils (fossil assemblages) plays a major role in the correlation of rocks. The rocks present in a different location, under favorable conditions, have preserved a good number of fossils.
The index fossils are most valuable because of their two main properties, such as their wide distribution in terms of geography and they appeared for a shorter period of time. These fossils are easily identified in the rock layers, and the presence of similar index fossils such as trilobite, ammonoids depicts that they must have deposited during the same time and the same type of rocks. This enables geologists to correlate the rocks of different places with the help of fossils/fossil assemblages.
Thus, the above statement is True.