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A template for an improved rock-based subdivision of the pre-Cryogenian timescale

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dc.contributor.authorShields, Graham A.en
dc.contributor.authorStrachan, Robin A.en
dc.contributor.authorPorter, Susannah M.en
dc.contributor.authorHalverson, Galen P.en
dc.contributor.authorMacdonald, Francis A.en
dc.contributor.authorPlumb, Kenneth A.en
dc.contributor.authorde Alvarenga, Carlos J.en
dc.contributor.authorBanerjee, Dhiraj M.en
dc.contributor.authorBekker, Andreyen
dc.contributor.authorBleeker, Wouteren
dc.contributor.authorBrasier, Alexanderen
dc.contributor.authorChakraborty, Partha P.en
dc.contributor.authorCollins, Alan S.en
dc.contributor.authorCondie, Kenten
dc.contributor.authorDas, Kaushiken
dc.contributor.authorEvans, David AD D.en
dc.contributor.authorErnst, Richarden
dc.contributor.authorFallick, Anthony E.en
dc.contributor.authorFrimmel, Hartwigen
dc.contributor.authorFuck, Reinhardten
dc.contributor.authorHoffman, Paul F.en
dc.contributor.authorKamber, Balz S.en
dc.contributor.authorKuznetsov, Anton B.en
dc.contributor.authorMitchell, Ross N.en
dc.contributor.authorPoire, Daniel G.en
dc.contributor.authorPoulton, Simon W.en
dc.contributor.authorRiding, Roberten
dc.contributor.authorSharma, Mukunden
dc.contributor.authorStorey, Craigen
dc.contributor.authorStueeken, Evaen
dc.contributor.authorTostevin, Rosalieen
dc.contributor.authorTurner, Elizabethen
dc.contributor.authorXiao, Shuhaien
dc.contributor.authorZhang, Shuanhongen
dc.contributor.authorZhou, Yingen
dc.contributor.authorZhu, Maoyanen
dc.date.accessioned2024-02-13T14:16:24Zen
dc.date.available2024-02-13T14:16:24Zen
dc.date.issued2021-07-07en
dc.description.abstractThe geological timescale before 720 Ma uses rounded absolute ages rather than specific events recorded in rocks to subdivide time. This has led increasingly to mismatches between subdivisions and the features for which they were named. Here we review the formal processes that led to the current timescale, outline rock-based concepts that could be used to subdivide pre-Cryogenian time and propose revisions. An appraisal of the Precambrian rock record confirms that purely chronostratigraphic subdivision would require only modest deviation from current chronometric boundaries, removal of which could be expedited by establishing event-based concepts and provisional, approximate ages for eon-, era-and period-level subdivisions. Our review leads to the following conclusions: (1) the current informal four-fold Archean subdivision should be simplified to a tripartite scheme, pending more detailed analysis, and (2) an improved rock-based Proterozoic Eon might comprise a Paleoproterozoic Era with three periods (early Paleoproterozoic or Skourian, Rhyacian, Orosirian), Mesoproterozoic Era with four periods (Statherian, Calymmian, Ectasian, Stenian) and a Neoproterozoic Era with four periods ( pre-Tonian or Kleisian, Tonian, Cryogenian and Ediacaran). These proposals stem from a wide community and could be used to guide future development of the pre-Cryogenian timescale by international bodies.en
dc.description.versionPublished versionen
dc.format.extent22 page(s)en
dc.format.mimetypeapplication/pdfen
dc.identifierARTN jgs2020-222 (Article number)en
dc.identifier.doihttps://doi.org/10.1144/jgs2020-222en
dc.identifier.eissn2041-479Xen
dc.identifier.issn0016-7649en
dc.identifier.issue1en
dc.identifier.orcidXiao, Shuhai [0000-0003-4655-2663]en
dc.identifier.urihttps://hdl.handle.net/10919/117972en
dc.identifier.volume179en
dc.language.isoenen
dc.publisherGeological Society of Americaen
dc.relation.urihttp://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000675889200001&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=930d57c9ac61a043676db62af60056c1en
dc.rightsCreative Commons Attribution-NonCommercial-NoDerivatives 4.0 Internationalen
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectGeologyen
dc.subjectORGANIC-WALLED MICROFOSSILSen
dc.subjectVASE-SHAPED MICROFOSSILSen
dc.subjectLARGE IGNEOUS PROVINCESen
dc.subjectPRECAMBRIAN TIME-SCALEen
dc.subjectDETRITAL ZIRCON GEOCHRONOLOGYen
dc.subjectSNOWBALL EARTH HYPOTHESISen
dc.subjectCARBON-ISOTOPE EXCURSIONen
dc.subjectNORTH CHINA CRATONen
dc.subjectU-PBen
dc.subjectPILBARA CRATONen
dc.titleA template for an improved rock-based subdivision of the pre-Cryogenian timescaleen
dc.title.serialJournal of The Geological Societyen
dc.typeArticle - Refereeden
dc.type.dcmitypeTexten
dc.type.otherArticleen
dc.type.otherJournalen
pubs.organisational-group/Virginia Techen
pubs.organisational-group/Virginia Tech/Scienceen
pubs.organisational-group/Virginia Tech/Science/Geosciencesen
pubs.organisational-group/Virginia Tech/All T&R Facultyen
pubs.organisational-group/Virginia Tech/Science/COS T&R Facultyen

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