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A template for an improved rock-based subdivision of the pre-Cryogenian timescale
Corresponding AuthorShields, Graham A.(g.shields@ucl.ac.uk)
Shields, Graham A.1; Strachan, Robin A.2; Porter, Susannah M.3; Halverson, Galen P.4; Macdonald, Francis A.3; Plumb, Kenneth A.5; de Alvarenga, Carlos J.6; Banerjee, Dhiraj M.7; Bekker, Andrey8; Bleeker, Wouter9
2021-07-07
Source PublicationJOURNAL OF THE GEOLOGICAL SOCIETY
ISSN0016-7649
Pages22
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.
DOI10.1144/jgs2020-222
Indexed BySCI
Language英语
WOS KeywordVASE-SHAPED MICROFOSSILS ; LARGE IGNEOUS PROVINCES ; ORGANIC-WALLED MICROFOSSILS ; PRECAMBRIAN TIME-SCALE ; DETRITAL ZIRCON GEOCHRONOLOGY ; SNOWBALL EARTH HYPOTHESIS ; CARBON-ISOTOPE EXCURSION ; NORTH CHINA CRATON ; U-PB ; PILBARA CRATON
WOS Research AreaGeology
WOS SubjectGeosciences, Multidisciplinary
WOS IDWOS:000675889200001
PublisherGEOLOGICAL SOC PUBL HOUSE
Document Type期刊论文
Identifierhttp://ir.nigpas.ac.cn/handle/332004/38415
Collection中国科学院南京地质古生物研究所
Corresponding AuthorShields, Graham A.
Affiliation1.UCL, Dept Earth Sci, London, England
2.Univ Portsmouth, Sch Environm Geog & Geosci, Portsmouth, Hants, England
3.Univ Calif Santa Barbara, Dept Earth Sci, Santa Barbara, CA 93106 USA
4.McGill Univ, Dept Earth & Planetary Sci, Montreal, PQ, Canada
5.Geosci Australia, Canberra, ACT, Australia
6.Univ Brasilia, Inst Geociencias, Brasilia, DF, Brazil
7.Univ Delhi, Dept Geol, Delhi, India
8.Univ Calif Riverside, Dept Earth & Planetary Sci, Riverside, CA 92521 USA
9.Geol Survey Canada, Ottawa, ON, Canada
10.Univ Aberdeen, Sch Geosci, Aberdeen, Scotland
Recommended Citation
GB/T 7714
Shields, Graham A.,Strachan, Robin A.,Porter, Susannah M.,et al. A template for an improved rock-based subdivision of the pre-Cryogenian timescale[J]. JOURNAL OF THE GEOLOGICAL SOCIETY,2021:22.
APA Shields, Graham A..,Strachan, Robin A..,Porter, Susannah M..,Halverson, Galen P..,Macdonald, Francis A..,...&Zhu, Maoyan.(2021).A template for an improved rock-based subdivision of the pre-Cryogenian timescale.JOURNAL OF THE GEOLOGICAL SOCIETY,22.
MLA Shields, Graham A.,et al."A template for an improved rock-based subdivision of the pre-Cryogenian timescale".JOURNAL OF THE GEOLOGICAL SOCIETY (2021):22.
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