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- Eonothem abstract "In stratigraphy and geology, an eonothem is the totality of rock strata laid down in the stratigraphic record deposited during a certain eon of the continuous geologic timescale. The eonothem is not to be confused with the eon itself, which is a corresponding division of geologic time spanning a specific amount of (millions of) years, during which rocks were formed that are classified within the eonothem. In practice, the rock column is discontinuous: Eonothems, despite discontinuities (locally missing strata or unconformities), can be compared to others where the rock record is more complete and by correlation of points of correspondence be fixed appropriately within the eon. Eonothems are therefore useful as a broad chronostratigraphic unit, specifying approximate age within the timelines within the rock column. Eonothems are subdivided into erathems and their smaller subdivisions within geology and paleobiology and their sub-fields, and a whole system of cross-disciplinary classification by strata is in place with oversight by the International Commission on Stratigraphy. Since oldest rocks are deposited first and lowest in a stratigraphic section, whether one is discussing the rock record is usually clear in context. (A fossil or feature present in the "upper Phanerozoic" eonothem (strata) would be discussed as being dated within the "later Phanerozoic" eon, whereas something found in the middle Phanerozoic could be discussing a layer, stage or the relative time.)Eonothems are not often used in practice as expert dating estimates can be and usually are specified into the more refined timelines of smaller chronostratigraphic units, which can be subdivided in turn down to the many defined stages, the smallest units used in dating. (see the hierarchy of comparative units, five each for time division types and five for the rock record types.)Eonothems have the same names as their corresponding eons, which means during the history of the Earth only four eonothems were formed. Oldest to newest these are the Hadean, Archean, Proterozoic, and Phanerozoic.".
- Eonothem thumbnail Horseshoe_Canyon.jpg?width=300.
- Eonothem wikiPageExternalLink md08.html.
- Eonothem wikiPageExternalLink aeon.
- Eonothem wikiPageExternalLink etyindex.html.
- Eonothem wikiPageExternalLink geotime.htm.
- Eonothem wikiPageExternalLink cheu.pdf.
- Eonothem wikiPageExternalLink gssp.htm.
- Eonothem wikiPageExternalLink over.htm.
- Eonothem wikiPageExternalLink timeform.html.
- Eonothem wikiPageExternalLink gtime1.html.
- Eonothem wikiPageID "17736936".
- Eonothem wikiPageRevisionID "586787893".
- Eonothem hasPhotoCollection Eonothem.
- Eonothem subject Category:Earth_sciences.
- Eonothem subject Category:Geochronology.
- Eonothem subject Category:Geologic_time_scale.
- Eonothem subject Category:Geology_timelines.
- Eonothem subject Category:Historical_geology.
- Eonothem subject Category:Paleobiology.
- Eonothem subject Category:Paleogeography.
- Eonothem subject Category:Stratigraphy.
- Eonothem type Abstraction100002137.
- Eonothem type Chronology106503224.
- Eonothem type Communication100033020.
- Eonothem type Evidence106643408.
- Eonothem type GeologyTimelines.
- Eonothem type Indication106797169.
- Eonothem type Record106647206.
- Eonothem type Timeline106504965.
- Eonothem type WrittenRecord106502378.
- Eonothem comment "In stratigraphy and geology, an eonothem is the totality of rock strata laid down in the stratigraphic record deposited during a certain eon of the continuous geologic timescale. The eonothem is not to be confused with the eon itself, which is a corresponding division of geologic time spanning a specific amount of (millions of) years, during which rocks were formed that are classified within the eonothem.".
- Eonothem label "Eonotem".
- Eonothem label "Eonotema".
- Eonothem label "Eonotema".
- Eonothem label "Eonothem".
- Eonothem label "Eonothem".
- Eonothem sameAs Eonotema.
- Eonothem sameAs Eonotema.
- Eonothem sameAs 누대층.
- Eonothem sameAs Eonothem.
- Eonothem sameAs Eonotem.
- Eonothem sameAs m.047fqtv.
- Eonothem sameAs Q11118098.
- Eonothem sameAs Q11118098.
- Eonothem sameAs Eonothem.
- Eonothem wasDerivedFrom Eonothem?oldid=586787893.
- Eonothem depiction Horseshoe_Canyon.jpg.
- Eonothem isPrimaryTopicOf Eonothem.