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对北京延庆杨户庄剖面产出的第四纪早期有孔虫和双壳化石以及当地妫水河生长的现代腹足类与河水的硼和锶的浓度与同位素组成进行了测定,并与现代的海相有孔虫进行了对比研究.结果表明这些有孔虫及双壳化石的硼和锶元素浓度和同位素组成与现代海相有孔虫存在明显差别,而与妫水河的现代陆相腹足类的相接近,这充分表明杨户庄剖面的第四纪早期有孔虫的生存环境是非海相环境.这一研究结果表明,杨户庄第四纪早期有孔虫不是“海侵”或“海泛”的结果;同时也表明有孔虫并非是特有的海洋生物,它完全可以在相似海洋的陆相环境中存在.
The concentration and isotopic composition of boron and strontium in the modern gastropods and river water from the early stage of the Quaternary Foraminifera and double-shell fossils in Yangpuzhuang Section of Yanqing in Beijing were measured. The results show that the concentration and isotopic composition of boron and strontium in these foraminifera and bivalve fossils are obviously different from that of modern marine foraminifera, The close proximity of gastropods indicates that the Quaternary Foraminifera environment in Yangzhuzhuang section is non-marine environment.The results of this study indicate that the early foraminifera of Yangjuzhuang is not “sea” Invasion “or” pan ". At the same time, it also shows that the foraminifera is not a unique marine organism, and it can exist in a similar marine terrestrial environment.