KnowraIndex fossilLinked fromLinked fromThe 14 pages that link to Index fossil, each with the reason it gives.All 14Broader topic 5Related 8Narrower topic 1BiostratigraphyRelated: Its limited time range and broad distribution make correlation more precise.William SmithRelated: Smith recognized that characteristic fossils could help match distant rock exposures.TrilobiteRelated: Some trilobite species had limited time ranges and broad geographic distributions.Stratigraphic correlationRelated: Its limited time range makes its occurrence a more precise tie between rock units.Geologic timeRelated: Its limited time range helps match strata and locate interval boundaries.North American land mammal ageRelated: Some characteristic mammals help identify particular intervals across separate localities.AmmonoideaRelated: Ammonoid fossils evolved rapidly and spread widely, making them useful for dating rocks.MicropaleontologyRelated: Short-ranging microfossil species can mark precise intervals in sedimentary rocks.