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- Biostratigraphy abstract "Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. Usually the aim is correlation, demonstrating that a particular horizon in one geological section represents the same period of time as another horizon at some other section. The fossils are useful because sediments of the same age can look completely different because of local variations in the sedimentary environment. For example, one section might have been made up of clays and marls while another has more chalky limestones, but if the fossil species recorded are similar, the two sediments are likely to have been laid down at the same time.Biostratigraphy originated in the early 19th century, where geologists recognised that the correlation of fossil assemblages between rocks of similar type but different age decreased as the difference in age increased. The method was well-established before Charles Darwin explained the mechanism behind it - evolution.Ammonites, graptolites, archeocyathids, and trilobites are index fossils that are widely used in biostratigraphy. Microfossils such as acritarchs, chitinozoans, conodonts, dinoflagellate cysts, pollen, spores and foraminiferans are also frequently used. Different fossils work well for sediments of different ages; trilobites, for example, are particularly useful for sediments of Cambrian age. To work well, the fossils used must be widespread geographically, so that they can occur in many different places. They must also be short lived as a species, so that the period of time during which they could be incorporated in the sediment is relatively narrow. The longer lived the species, the poorer the stratigraphic precision, so fossils that evolve rapidly, such as ammonites, are favoured over forms that evolve much more slowly, like nautiloids. Often biostratigraphic correlations are based on a fauna, not an individual species, as this allows greater precision. Further, if only one species is present in a sample, it can mean that (1) the strata were formed in the known fossil range of that organism; (2) that the fossil range of the organism was incompletely known, and the strata extend the known fossil range. For instance, the presence of the fossil Treptichnus pedum was used to define the base of the Cambrian period, but it has since been found in older strata.Fossil assemblages were traditionally used to designate the duration of periods. Since a large change in fauna was required to make early stragtigraphers create a new period, most of the periods we recognise today are terminated by a major extinction event or faunal turnover.".
- Biostratigraphy thumbnail Archeocyathids.JPG?width=300.
- Biostratigraphy wikiPageExternalLink www.bslsonline.com.
- Biostratigraphy wikiPageID "670765".
- Biostratigraphy wikiPageLength "6799".
- Biostratigraphy wikiPageOutDegree "42".
- Biostratigraphy wikiPageRevisionID "666496502".
- Biostratigraphy wikiPageWikiLink Acritarch.
- Biostratigraphy wikiPageWikiLink Acritarchs.
- Biostratigraphy wikiPageWikiLink Albert_Oppel.
- Biostratigraphy wikiPageWikiLink Alcide_dOrbigny.
- Biostratigraphy wikiPageWikiLink Ammonite.
- Biostratigraphy wikiPageWikiLink Ammonoidea.
- Biostratigraphy wikiPageWikiLink Archaeocyatha.
- Biostratigraphy wikiPageWikiLink Archeocyathid.
- Biostratigraphy wikiPageWikiLink Biochronology.
- Biostratigraphy wikiPageWikiLink Cambrian.
- Biostratigraphy wikiPageWikiLink Category:Fossils.
- Biostratigraphy wikiPageWikiLink Category:Stratigraphy.
- Biostratigraphy wikiPageWikiLink Category:Subfields_of_paleontology.
- Biostratigraphy wikiPageWikiLink Chalk.
- Biostratigraphy wikiPageWikiLink Charles_Darwin.
- Biostratigraphy wikiPageWikiLink Chitinozoa.
- Biostratigraphy wikiPageWikiLink Chitinozoan.
- Biostratigraphy wikiPageWikiLink Chronostratigraphy.
- Biostratigraphy wikiPageWikiLink Chronozone.
- Biostratigraphy wikiPageWikiLink Clay.
- Biostratigraphy wikiPageWikiLink Conodont.
- Biostratigraphy wikiPageWikiLink Conodonts.
- Biostratigraphy wikiPageWikiLink Depositional_environment.
- Biostratigraphy wikiPageWikiLink Dinoflagellate.
- Biostratigraphy wikiPageWikiLink Evolution.
- Biostratigraphy wikiPageWikiLink Foraminifera.
- Biostratigraphy wikiPageWikiLink Fossil.
- Biostratigraphy wikiPageWikiLink Graptolite.
- Biostratigraphy wikiPageWikiLink Graptolithina.
- Biostratigraphy wikiPageWikiLink Horizon_(geology).
- Biostratigraphy wikiPageWikiLink Index_fossil.
- Biostratigraphy wikiPageWikiLink Limestone.
- Biostratigraphy wikiPageWikiLink Lithostratigraphy.
- Biostratigraphy wikiPageWikiLink Marl.
- Biostratigraphy wikiPageWikiLink Micropaleontology.
- Biostratigraphy wikiPageWikiLink Nautiloid.
- Biostratigraphy wikiPageWikiLink Palaeontologist.
- Biostratigraphy wikiPageWikiLink Paleontology.
- Biostratigraphy wikiPageWikiLink Pollen.
- Biostratigraphy wikiPageWikiLink Sediment.
- Biostratigraphy wikiPageWikiLink Sedimentary_depositional_environment.
- Biostratigraphy wikiPageWikiLink Spore.
- Biostratigraphy wikiPageWikiLink Spores.
- Biostratigraphy wikiPageWikiLink Stratigraphy.
- Biostratigraphy wikiPageWikiLink Stratum.
- Biostratigraphy wikiPageWikiLink Tectonostratigraphy.
- Biostratigraphy wikiPageWikiLink Treptichnus_pedum.
- Biostratigraphy wikiPageWikiLink Trilobite.
- Biostratigraphy wikiPageWikiLink File:Archeocyathids.JPG.
- Biostratigraphy wikiPageWikiLink File:DiplograptusCaneySprings.jpg.
- Biostratigraphy wikiPageWikiLinkText "Archosaurus".
- Biostratigraphy wikiPageWikiLinkText "Biostratigraphic".
- Biostratigraphy wikiPageWikiLinkText "Biostratigraphically".
- Biostratigraphy wikiPageWikiLinkText "Biostratigraphy".
- Biostratigraphy wikiPageWikiLinkText "Cistecephalus".
- Biostratigraphy wikiPageWikiLinkText "Dicynodon".
- Biostratigraphy wikiPageWikiLinkText "Stratigraphic paleobiology".
- Biostratigraphy wikiPageWikiLinkText "Tapinocephalus".
- Biostratigraphy wikiPageWikiLinkText "Tropidostoma".
- Biostratigraphy wikiPageWikiLinkText "biostratigrapher".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphers".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphic Assemblage zones".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphic zone".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphic zones".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphic".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphical reference locality".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphical".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphically".
- Biostratigraphy wikiPageWikiLinkText "biostratigraphy".
- Biostratigraphy wikiPageWikiLinkText "biostratrigraphic".
- Biostratigraphy wikiPageWikiLinkText "biozonation".
- Biostratigraphy wikiPageWikiLinkText "characteristic fossils of different animals".
- Biostratigraphy wikiPageWikiLinkText "fossil sequence".
- Biostratigraphy hasPhotoCollection Biostratigraphy.
- Biostratigraphy wikiPageUsesTemplate Template:Further.
- Biostratigraphy wikiPageUsesTemplate Template:Further2.
- Biostratigraphy wikiPageUsesTemplate Template:Paleontology.
- Biostratigraphy wikiPageUsesTemplate Template:Refimprove.
- Biostratigraphy wikiPageUsesTemplate Template:Reflist.
- Biostratigraphy subject Category:Fossils.
- Biostratigraphy subject Category:Stratigraphy.
- Biostratigraphy subject Category:Subfields_of_paleontology.
- Biostratigraphy hypernym Branch.
- Biostratigraphy type Article.
- Biostratigraphy type Organisation.
- Biostratigraphy type Article.
- Biostratigraphy type Subfield.
- Biostratigraphy comment "Biostratigraphy is the branch of stratigraphy which focuses on correlating and assigning relative ages of rock strata by using the fossil assemblages contained within them. Usually the aim is correlation, demonstrating that a particular horizon in one geological section represents the same period of time as another horizon at some other section. The fossils are useful because sediments of the same age can look completely different because of local variations in the sedimentary environment.".
- Biostratigraphy label "Biostratigraphy".
- Biostratigraphy sameAs Biostratigrafie.
- Biostratigraphy sameAs دراسة_الطبقات_الحيوية.
- Biostratigraphy sameAs Biostratigrafia.
- Biostratigraphy sameAs Biostratigrafie.