Hisatake Okada's research while affiliated with Yamagata University and other places
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Citations
... Diatoms, radiolarians, calcareous nannofossils, and planktonic foraminifera contained in the depositional sequences recovered at the analysed sites were the main set of biostratigraphic evidence used by the ODP and DSDP for age determination of the sediment column hosting the silica reaction boundary. Depending on aboundancy and the degree of preservation, the calcareous nannofossils were commonly used to develop the biostratigraphic framework for some sequences following the zonation scheme of Okada and Bukry (1980). Relating to contrast in the aboundancy of diatom tests above and below the silica transition zone, diatoms were employed to especially control the biostratigraphy at the sites sufficiently containing biosilica. ...
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