The damp fans, rivers and lakes sedimentary systems and the deposit of fan march, river marsh and lake march: taking Yanqi Basin as an example;
结论在潮湿气候条件下形成的潮湿扇、河流和湖泊沉积体系富含煤层、碳质泥岩和灰黑色泥岩,各类沼泽沉积发育,从而形成了该区较为发育的扇沼-河沼-湖沼沉积模式。
The role of fossil diatom study in paleolimnology is to analogize the ancient lakes, reconstruct their lake envirnmental evolution histories and find out lake function and lake variation regularities based upon the distribution, ecology and environmental condition of living diatom flora in modern lakes, and upon some other organic and inorganic indicators and dating data as well.
化石硅藻由于其丰度高、壳体易于保存,对环境变化敏感、分布范围广等特点,已成为古湖沼学研究中的重要研究手段。
