This result was the biochronological base for estimating sample ages in the study on genus gephyrocapsa . 2 . morphological variation of gephyrocapsa was investigated based on biometrically analyzing 6 morphological features of a coccolith placolith , e . g ( 2 )结合时间序列来对桥石种类的在演化的过程中形态变化进行分析，发现在整体演变的进程中，几种形态因子中一直处在最剧烈变化中的是盾盘的长度。
2.
This study is a post - cruise study of this leg , calcareous nannofossil samples from sites 1146 , 1147 and 1148 of leg 184 were analyzed to provide a high - resolution biostratigraphy for this leg and to investigate morphological variation of coccolith genus gephyrocapsa . the main results of this study are : 1 . 12 late pliocene to pleistocene bio - events were recognized and 6 zones of martini ( 1971 ) were determined for the upper sediment sequences of sites 1146 and 1148 本文作为大洋钻探项目船下后续研究的一部分，对184航次中的1146站位和1147 、 1148站位的样品进行了分析和研究，在船上科学家已经建立起的地层框架的基础上进一步加密采样，对生物事件标志化石类别进行数量统计，进一步确定了12个生物事件在钻孔中的深度，建立起了两个站位的高分辨率的钙质超微化石生物地层框架。
