Calcareous nannofossil abundance and datums of sediments from ODP Leg 170 sites

Three Pleistocene, five Pliocene, and thirteen late and middle Miocene calcareous nannofossil datums have been identified in the Leg 170 cored sequences collected from a...在采集自某区域的170航次岩心序列中，已识别出3个更新世（Pleistocene）、5个上新世（Pliocene）以及13个晚中新世与中中新世的钙质超微化石（calcareous nannofossil）生物地层基准面。