Question

Why are the best index fossils widespread?

Answer 1

Because they contain trilobite fossils.

Step-by-step explanation:

Fossils are the remaining of the dead organisms on the earth for a prolonged period of time. These are mainly used for the determination of the rock's and the layer's age. The age of the rocks can be determined accurately using the Index fossils. These are formed from the organisms that lived over a wide range of locations.

Index fossils are those that are useful for the determination of the age of the rocks more accurately. Most of the index fossils contains trilobite fossils. These are obtained from the animals called trilobite . These are marine animals and they are wide spread in nature. This is the reason why most of the index fossils contains trilobite fossils.

Answer 2

The reason for index fossils being widespread is explained below.

Explanation:

• Every fossil is located and found on earth tell us something about the age of the rock it's found in.
• Among the various fossils" Index fossils" tells us the most information.
• "Index fossils" are also known as "key fossils or type fossils".
• "Index fossils" are widespread geographically because it helps geologist to use them in correlating strata across vast distances.
• Most Index fossils are marine organisms because ocean currents allow them to populate over a large area.
• Index fossils are abundant, which means there were a lot of them existed over a large geographical area.
• Trilobite and Ammonite are the most available Index fossils.