E.M.V. Nambudiri, James T. Teller, W. M. Last; Pre-Quaternary microfossils—A guide to errors in radiocarbon dating. Geology ; 8 (3): 123–126. doi: https://doi.org/10.1130/0091-7613(1980)8<123:PMGTEI>2.0.CO;2
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The presence of pre-Quaternary microfossils and anomalously old radiocarbon dates frorh fine-grained organic material in Lake Manitoba sediment suggests that old noncarbonate carbon is contaminating these fine-grained deposits. The relative abundance of the pre-Quaternary microfossils in these muds is used as a guide to correcting the anomalous 14C dates.