certain fossils can be used to help determine the age of the rock layer in which the fossils are found…

certain fossils can be used to help determine the age of the rock layer in which the fossils are found. which type of fossil is best to use when making this determination?\nmarine mammal fossil\nswamp fern fossil\ntrace fossil\nindex fossil

certain fossils can be used to help determine the age of the rock layer in which the fossils are found. which type of fossil is best to use when making this determination?\nmarine mammal fossil\nswamp fern fossil\ntrace fossil\nindex fossil

Answer

Brief Explanations:

Index fossils are widespread geographically, lived for a relatively short - time period, and are abundant. They are ideal for determining the age of rock layers as their presence indicates a specific time interval. Marine mammal fossils, swamp fern fossils, and trace fossils may not have the same wide - spread and time - specific characteristics as index fossils.

Answer:

D. index fossil