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- Index_fossil abstract "Index fossils (also known as guide fossils, indicator fossils or zone fossils) are fossils used to define and identify geologic periods (or faunal stages). They work on the premise that, although different sediments may look different depending on the conditions under which they were laid down, they may include the remains of the same species of fossil. If the species concerned were short-lived (in geological terms, lasting a few hundred thousand years), then it is certain that the sediments in question were deposited within that narrow time period. The shorter the lifespan of a species, the more precisely different sediments can be correlated, and so rapidly evolving types of fossils are particularly valuable. The best index fossils are common, easy-to-identify at species level, and have a broad distribution—otherwise the likelihood of finding and recognizing one in the two sediments is minor.Ammonites fit these demands well, and are the best-known fossils that have been widely used for this. Other important groups that provide index fossils are the corals, graptolites, brachiopods, trilobites, and echinoids (sea urchins). Conodonts may be identified by experts using light microscopy such that they can be used to index a given sample with good resolution. Fossilized teeth of mammals have also been used.Geologists use both large fossils (called macrofossils) and microscopic fossils (called microfossils) for this process, known as biostratigraphy. Macrofossils have the advantage of being easy to see in the field, but they are rarer, and microfossils are very commonly used by oil prospectors and other industries interested in mineral resources when accurate knowledge of the age of the rocks being looked at is needed.The series of deposits that spans the occurrence of a particular index fossil, is often referred to as that fossil's zone, enabling to relate different faunas through time. An example would be to say that Mesolenellus hyperborea occurs in the late Nevadella-zone.".
- Index_fossil thumbnail Index_fossils.gif?width=300.
- Index_fossil wikiPageID "45930".
- Index_fossil wikiPageLength "6071".
- Index_fossil wikiPageOutDegree "99".
- Index_fossil wikiPageRevisionID "674680111".
- Index_fossil wikiPageWikiLink Abner_Doubleday.
- Index_fossil wikiPageWikiLink Alfred,_Lord_Tennyson.
- Index_fossil wikiPageWikiLink Alfred_Tennyson.
- Index_fossil wikiPageWikiLink Ammonite.
- Index_fossil wikiPageWikiLink Ammonoidea.
- Index_fossil wikiPageWikiLink Archaeocyatha.
- Index_fossil wikiPageWikiLink Archeocyathid.
- Index_fossil wikiPageWikiLink Argopecten_gibbus.
- Index_fossil wikiPageWikiLink Argopectin_gibbus.
- Index_fossil wikiPageWikiLink Atlantic_calico_scallop.
- Index_fossil wikiPageWikiLink Billingselia_corrugata.
- Index_fossil wikiPageWikiLink Biostratigraphy.
- Index_fossil wikiPageWikiLink Brachiopod.
- Index_fossil wikiPageWikiLink Cactocrinus_multibrachiatus.
- Index_fossil wikiPageWikiLink Calamity_Jane.
- Index_fossil wikiPageWikiLink Calyptraphorus_velatus.
- Index_fossil wikiPageWikiLink Cambrian.
- Index_fossil wikiPageWikiLink Cambrian_Period.
- Index_fossil wikiPageWikiLink Category:Fossils.
- Index_fossil wikiPageWikiLink Category:Geological_history_of_Earth.
- Index_fossil wikiPageWikiLink Category:Index_fossils.
- Index_fossil wikiPageWikiLink Category:Paleontological_concepts_and_hypotheses.
- Index_fossil wikiPageWikiLink Conodont.
- Index_fossil wikiPageWikiLink Coral.
- Index_fossil wikiPageWikiLink Cretaceous.
- Index_fossil wikiPageWikiLink Cretaceous_Period.
- Index_fossil wikiPageWikiLink Devonian.
- Index_fossil wikiPageWikiLink Devonian_Period.
- Index_fossil wikiPageWikiLink Dictyoclostus_americanus.
- Index_fossil wikiPageWikiLink E.L._Doctorow.
- Index_fossil wikiPageWikiLink E._L._Doctorow.
- Index_fossil wikiPageWikiLink Early_Pleistocene.
- Index_fossil wikiPageWikiLink Eocene.
- Index_fossil wikiPageWikiLink File:Calico_scallop_02.jpg.
- Index_fossil wikiPageWikiLink Fossil.
- Index_fossil wikiPageWikiLink Fossilized.
- Index_fossil wikiPageWikiLink Geologic_column.
- Index_fossil wikiPageWikiLink Geologic_time_scale.
- Index_fossil wikiPageWikiLink Geologist.
- Index_fossil wikiPageWikiLink Graptolite.
- Index_fossil wikiPageWikiLink Graptolithina.
- Index_fossil wikiPageWikiLink Inoceramus.
- Index_fossil wikiPageWikiLink Inoceramus_labiatus.
- Index_fossil wikiPageWikiLink Jim_Bridger.
- Index_fossil wikiPageWikiLink John_McPhee.
- Index_fossil wikiPageWikiLink Jurassic.
- Index_fossil wikiPageWikiLink Jurassic_Period.
- Index_fossil wikiPageWikiLink Leptodus.
- Index_fossil wikiPageWikiLink Leptodus_americanus.
- Index_fossil wikiPageWikiLink Lophophyllidium_proliferum.
- Index_fossil wikiPageWikiLink Lower_Cambrian.
- Index_fossil wikiPageWikiLink Macrofossil.
- Index_fossil wikiPageWikiLink Mammal.
- Index_fossil wikiPageWikiLink Martha_Jane_Canary.
- Index_fossil wikiPageWikiLink Mesolenellus.
- Index_fossil wikiPageWikiLink Microscopy.
- Index_fossil wikiPageWikiLink Mineral.
- Index_fossil wikiPageWikiLink Mississippian_(geology).
- Index_fossil wikiPageWikiLink Mississippian_Period.
- Index_fossil wikiPageWikiLink Monotis_subcircularis.
- Index_fossil wikiPageWikiLink Mucrospirifer.
- Index_fossil wikiPageWikiLink Mucrospirifer_mucronatus.
- Index_fossil wikiPageWikiLink Neptunea_tabulata.
- Index_fossil wikiPageWikiLink Nerinea_trinodosa.
- Index_fossil wikiPageWikiLink Ordovician.
- Index_fossil wikiPageWikiLink Ordovician_Period.
- Index_fossil wikiPageWikiLink Palmatolepis_unicornis.
- Index_fossil wikiPageWikiLink Paradoxides.
- Index_fossil wikiPageWikiLink Parafusulina.
- Index_fossil wikiPageWikiLink Parafusulina_bosei.
- Index_fossil wikiPageWikiLink Pecten_gibbus.
- Index_fossil wikiPageWikiLink Pennsylvanian_(geology).
- Index_fossil wikiPageWikiLink Pennsylvanian_Period.
- Index_fossil wikiPageWikiLink Perisphinctes.
- Index_fossil wikiPageWikiLink Perisphinctes_tiziani.
- Index_fossil wikiPageWikiLink Permian.
- Index_fossil wikiPageWikiLink Permian_Period.
- Index_fossil wikiPageWikiLink Petroleum.
- Index_fossil wikiPageWikiLink Prolecanites_gurleyi.
- Index_fossil wikiPageWikiLink Quaternary.
- Index_fossil wikiPageWikiLink Quaternary_Period.
- Index_fossil wikiPageWikiLink Rutherford_B._Hayes.
- Index_fossil wikiPageWikiLink Scaphites.
- Index_fossil wikiPageWikiLink Scaphites_hippocrepis.
- Index_fossil wikiPageWikiLink Sea_urchin.
- Index_fossil wikiPageWikiLink Sediment.
- Index_fossil wikiPageWikiLink Silurian.
- Index_fossil wikiPageWikiLink Silurian_Period.
- Index_fossil wikiPageWikiLink Species.
- Index_fossil wikiPageWikiLink Teeth.
- Index_fossil wikiPageWikiLink Tertiary.
- Index_fossil wikiPageWikiLink Tertiary_Period.
- Index_fossil wikiPageWikiLink Tetragraptus_fructicosus.
- Index_fossil wikiPageWikiLink Tiglian.