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Figure F34. Percent changes of Neodenticula seminae, Neodenticula kamtschatica, and Neodenticula koizumii within total counts of three taxa belonging to genus Neodenticula, Holes U1340A and U1340B. Based on the rapid increases (RI) and decreases (RD) of each taxon, a clear assignment of tie points is accomplished. The RI of N. koizumii and RD of N. kamtschatica coincide with the top of Gauss at 2.581 Ma. The RD of N. koizumii and RI of N. seminae coincide with the top of Olduvai at 1.778 Ma.

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