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参考文献
- Cohen, K.M.; Finney, S.C.; Gibbard, P.L.; Fan, J.-X. The ICS International Chronostratigraphic Chart (PDF). 2017/02: 199–204. 2013 [2022-01-20].
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被忽略 (帮助) - U.S. Geological Survey Geologic Names Committee. Divisions of Geologic Time—Major Chronostratigraphic and Geochronologic Units (PDF). USGS. [2022-01-20]. Fact Sheet 2007-3015.