KnowraIndex fossilLinked fromLinked fromThe 14 pages that link to Index fossil, each with the reason it gives.All 14Broader topic 5Related 8Narrower topic 1FossilBroader topic: Its limited time range makes it useful for dating strata relatively.Fossil recordBroader topic: Its restricted time range helps assign ages to fossil-bearing rocks.Deep timeBroader topic: These fossils let geologists match distant strata without relying on identical rock types.Relative datingBroader topic: Its limited time range can sharply constrain a layer's relative position.Geologic recordBroader topic: Its limited time range helps match distant parts of the record.