沙河街组介形虫化石群定量分析方法及其地质意义

本文通过对山东济阳坳陷沙河街组含介形虫化石岩心样品进行散样方法试验，表明水煮法、汽油法是第三纪地层微古分析行之有效的样品处理方法，利用这种方法可以获得大量的数据，从而可以进行介形虫等微体化石群的定量分析。文中对沙河街组介形虫化石群的一个组合和三个亚组合进行了定量分析。分析结果表明，较之以前定性描述，定量分析更能完整、准确地反映化石群面貌，并可进行种群结构、群落结构研究，从而为进行沙河街组沉积时期的

QUANTITATIVE ANALYSES OF OSTRACOD FAUNAS IN THE SHAHEJIE FORMATION AND THEIR GEOLOGICAL SIGNIFICANCE

A test on methods of sample preparation for ostracod--bearing core samples of Shahejie Formation in the Jiyang Depression, Shandong Province shows that the methods of oil andgasoline is effective for the sample preparation of microfossil analysis of Tertiary sediment.A number of quantitative data can be obtained by using this method. Quantitative analyses of one assemblage (Camarocypris elliptica assemblage) and 3 sub-assemblages (Phacocypris vulgata subassemblage, Huabeinia obscura subassemblage, Aus-trocypris postcaudata subassemblage) of ostracod faunas in the Shahejie Formation have beenmade. The structure of population and community is studied. providing important informa-tion of palaeolimnology during the deposition of the Shahejie Formation.