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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 wikiPageRevisionID "603913583".
- Index_fossil hasPhotoCollection Index_fossil.
- Index_fossil subject Category:Fossils.
- Index_fossil subject Category:Geological_history_of_Earth.
- Index_fossil subject Category:Index_fossils.
- Index_fossil subject Category:Paleontology.
- Index_fossil comment "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.".
- Index_fossil label "Fossile guida".
- Index_fossil label "Fossile stratigraphique".
- Index_fossil label "Fósil director".
- Index_fossil label "Fóssil de idade".
- Index_fossil label "Gidsfossiel".
- Index_fossil label "Index fossil".
- Index_fossil label "Leitfossil".
- Index_fossil label "Skamieniałość przewodnia".
- Index_fossil label "Руководящие ископаемые".
- Index_fossil label "مؤشر أحفوري".
- Index_fossil label "指準化石".
- Index_fossil label "示準化石".
- Index_fossil sameAs Leitfossil.
- Index_fossil sameAs Fósil_director.
- Index_fossil sameAs Fossile_stratigraphique.
- Index_fossil sameAs Fossile_guida.
- Index_fossil sameAs 示準化石.
- Index_fossil sameAs Gidsfossiel.
- Index_fossil sameAs Skamieniałość_przewodnia.
- Index_fossil sameAs Fóssil_de_idade.
- Index_fossil sameAs m.0cg1w.
- Index_fossil sameAs Q502892.
- Index_fossil sameAs Q502892.
- Index_fossil wasDerivedFrom Index_fossil?oldid=603913583.
- Index_fossil depiction Index_fossils.gif.
- Index_fossil isPrimaryTopicOf Index_fossil.
