H. J. Hofmann; Precambrian time units and nomenclature—The geon concept. Geology ; 18 (4): 340–341. doi: https://doi.org/10.1130/0091-7613(1990)018<0340:PTUANT>2.3.CO;2
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A geologic calendar using the concept of geon (a time unit of 108 a) is suggested as an alternative to the recently proposed complex nomenclature for Proterozoic periods.
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