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 (2008). Stratigraphic Units as Defined in the North American Stratigraphic Code, 1983. In A Dictionary of Earth Sciences. : Oxford University Press. Retrieved 30 Nov. 2020, from https://www.oxfordreference.com/view/10.1093/acref/9780199211944.001.0001/acref-9780199211944-appendix-0001.