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- Erathem abstract "In stratigraphy, paleontology, geology, and geobiology an erathem is the total stratigraphic unit deposited during a certain corresponding span of time during an era in the geologic timescale.It can therefore be used as a chronostratigraphic unit of time which delineates a large span of years — less than an geological eon, but greater than its successively smaller and more refined subdivisions (geologic periods, epochs, and geologic ages). By 3,500 Million years ago (Mya) simple life had developed on earth (the oldest known microbial fossils in Australia are dated to this figure. The atmosphere was a mix of noxious and poisonous gases (Methane, Ammonia, Sulphur compounds, etc.— a so-called reducing atmosphere lacking much free oxygen which was bound up in compounds).These simple organisms, Cyanobacteria ruled the still cooling earth for approximately a thousand million (over a billion) years and gradually transformed the atmosphere to one containing free oxygen. These changes, along with tectonic activity left chemical trails (red bed formation, etc.) and other physical clues (magnetic orientation, layer formation factors) in the rock record, and it is these changes along with the later richer fossil record which specialists use to demarcate times early in planet earth's history in various disciplines.Erathems are not often used in practice. While they are subdivisions of eonothems and are themselves subdivided into systems, dating experts prefer the finer resolution of smaller spans of time when evaluating strata.Erathems have the same names as their corresponding eras.The Phanerozoic eonothem can thus be divided into a Cenozoic, a Mesozoic and a Paleozoic erathem or matching era name.Similarly, the Proterozoic eonothem is divided youngest to oldest into theNeoproterozoic, Mesoproterozoic and Paleoproterozoic erathems,and the Archean eon and eonothem are divided similarly into theNeoarchean, Mesoarchean, Paleoarchean and the Eoarchean, for which a lower (oldest) limit is undefined.↑ 1.0 1.1 1.2 1.3 ↑ 2.0 2.1 2.2 2.3 ↑ 3.0 3.1 3.2 3.3 ↑".
- Erathem wikiPageExternalLink md08.html.
- Erathem wikiPageExternalLink index.php?parentid=all.
- Erathem wikiPageExternalLink displayAbstract?fromPage=online&aid=74669.
- Erathem wikiPageExternalLink aeon.
- Erathem wikiPageExternalLink etyindex.html.
- Erathem wikiPageExternalLink geotime.htm.
- Erathem wikiPageExternalLink cheu.pdf.
- Erathem wikiPageExternalLink over.htm.
- Erathem wikiPageExternalLink timeform.html.
- Erathem wikiPageExternalLink gtime1.html.
- Erathem wikiPageID "17737010".
- Erathem wikiPageRevisionID "599756049".
- Erathem hasPhotoCollection Erathem.
- Erathem subject Category:Earth_sciences.
- Erathem subject Category:Geochronology.
- Erathem subject Category:Geologic_time_scale.
- Erathem subject Category:Geology_timelines.
- Erathem subject Category:Historical_geology.
- Erathem subject Category:Paleobiology.
- Erathem subject Category:Paleogeography.
- Erathem subject Category:Stratigraphy.
- Erathem subject Category:Units_of_time.
- Erathem type Abstraction100002137.
- Erathem type Chronology106503224.
- Erathem type Communication100033020.
- Erathem type Evidence106643408.
- Erathem type GeologyTimelines.
- Erathem type Indication106797169.
- Erathem type Measure100033615.
- Erathem type Record106647206.
- Erathem type TimeUnit115154774.
- Erathem type Timeline106504965.
- Erathem type UnitsOfTime.
- Erathem type WrittenRecord106502378.
- Erathem comment "In stratigraphy, paleontology, geology, and geobiology an erathem is the total stratigraphic unit deposited during a certain corresponding span of time during an era in the geologic timescale.It can therefore be used as a chronostratigraphic unit of time which delineates a large span of years — less than an geological eon, but greater than its successively smaller and more refined subdivisions (geologic periods, epochs, and geologic ages).".
- Erathem label "Eratem".
- Erathem label "Eratema".
- Erathem label "Erathem".
- Erathem label "Erathem".
- Erathem label "Эратема".
- Erathem sameAs Eratema.
- Erathem sameAs 대층.
- Erathem sameAs Erathem.
- Erathem sameAs Eratem.
- Erathem sameAs m.047fhw0.
- Erathem sameAs Q2464485.
- Erathem sameAs Q2464485.
- Erathem sameAs Erathem.
- Erathem wasDerivedFrom Erathem?oldid=599756049.
- Erathem isPrimaryTopicOf Erathem.