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渤海湾西岸至今尚残存几道贝壳堤,它们表征着古海岸线变化情况;为人们查明海岸线的形成时代及位置的变迁提供了基础条件;也为研究该区的气候演化及其它地质现象提供了有利条件。 1973年,我们曾对该区进行过短期野外考察,采集了部分贝壳化石标本。1978年,中科院地球化学研究所C~(14)实验室测定了所采标本的C~(14)年代。1981年,笔者又对该区所产贝壳化石标本进行了氨基酸外消旋程度的测定,获得了贝壳堤的形成时代。笔者仅就氨基酸外消旋方面的部分问题进行讨论。
The western coast of the Bohai Bay still has several seawalls remaining, which characterize the changes of the ancient coastline. It provides the basic conditions for people to identify the formation time and location of the coastline. It also provides the basis for studying the climate evolution and other geological phenomena in this area Favorable conditions In 1973, we conducted a short field visit to the area and collected some specimens of fossilized shellfish. In 1978, the Institute of Geochemistry, Chinese Academy of Sciences Institute of C ~ (14) measured the specimens taken C ~ (14) years. In 1981, the author also carried out the determination of the racemic degree of amino acid in the fossil specimens of shellfish produced in this area, and obtained the formation era of shell dike. The author discusses only some of the problems with racemization of amino acids.