Question

!!!!!!!!!!!!H-E-L-P!!!!!!!!!! How do index fossils help scientists establish how old rocks and other fossils are? In your answer, include fossils in the same layer of rock, in a lower layer of rock, and in a higher layer of rock compared to an index fossil.

Answer 1

the explanation is the answer.

Step-by-step explanation:

Index fossils must be known to live in a specific period, exist in abundance, and be easily found and identified. Using index fossils helps with the problem in the relative age dating method of not being able to assume that rock layers and age at one location are the same as at another location due to variations in the structure and features of Earth. The principle of faunal succession means that the fossil species can’t appear before the species came into being, and once they’re extinct, they don’t reappear in younger rocks. That means that fossils will not appear at a lower level than the time period they can into existent. The fossil will be found in the same layer of rock as they existed and cannot appear in the layer of rock after their extinction.

Answer 2

Certain fossils, called index fossils, help geologists match rock layers. To be useful as an index fossil, a fossil must be widely distributed and represent a type of organism that existed for a brief time period. Index fossils are useful because they tell the relative ages of the rock layers in which they occur.