Question: Which of the following statements best describes the purpose of index fossils in the fossil record? Need Assignment Help? A Index fossils have been artificially created in laboratories to serve as reference points for dating ancient artifacts and geological formations. B Index fossils are rare and unique ones that are difficult to find but provide valuable information about ancient ecosystems. C Index fossils can be found in multiple locations and are used to determine the relative age of rock layers and correlate different geological formations.