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\nseafloor - level fossil\nindex fossil\ninsect 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\nseafloor - level fossil\nindex fossil\ninsect fossil

Answer

Brief Explanation:

Index fossils are widespread geographically, have a short stratigraphic range, and are abundant. They are ideal for determining the age of rock layers. Marine - mammal fossils, sea - lily fossils, and trace fossils are not as effective as index fossils for this purpose due to their less specific time - indicating properties.

Answer:

index fossil