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根据笔者在沂沭河中下游地区（临沂—宿迁一带）第四纪地层中所发现的有孔虫、海相介形虫组合及室内外所获其他有关资料,初步确定了区内第四系的海相层及其时代归属。
According to the foraminifera, marine ostracod assemblages and other indoor and outdoor information found in Quaternary strata in the middle and lower reaches of Yishu River (Linyi-Suqian area), the author initially determined the Quaternary Marine phase and its era attribution.