黑龙江嘉荫晚白垩世渔亮子组孢粉地层研究

黑龙江嘉荫县渔亮子组是我国最早发现爬行动物化石的层位，盛产鸭嘴龙等爬行类化石，前人认为，该组在层位上相当于北美晚白垩世马斯特里赫特期Ｅｄｍｏｎｔｏｎ群，ＨｅｌｌＣｒｅｅｋ和Ｌａｎｃｅ组，但孢粉化石资料提示，渔亮子组中的被子植物花粉尚未发展至上述群（组）的阶段，其层位应较之低，大致相当于北美的坎佩尼期ＢｅｌｌｙＲｉｖｅｒ群（组）或相当层位。

PALYNO STRATIGRAPHIC STUDY OF THE UPPER CRETACEOUS YULIANGZI FORMATION, JIAYIN, HEILONGJIANG

The Yuliangzi Formation, well exposed in Jiayin, Heilongjiang is well known for its yielding rich duck billed dinosaurs (Hadrosauridae). Some authors (Yang, 1958; Luo et al., 1983) suggested this formation be equivalent to the Late Cretaceous Lance or Edmonton Formation of North America in age. Palynologically, however, the present authors think the formation is correlated well with the Belly River Group or its equivalent strata rather than the Lance or Edmonton. The microfloras of the Yuliangzi Formation differ from those of the Lance or Edmonton mainly in much less diversity and abundance of angiosperm pollen such as Aquilapollenites, Intergricorpus and/or the family Ulmaceae pollen, the absence of the typical element of the Maestrichtian angiosperm pollen Wodehouseia and the presence of fern spores Ghoshispora longirimosa (Kondinskaya) Srivastava and Ariadnaesporites longiprocessum (Hills et Jensen) Hills. Althouth it is difficult to make a detailed comparison between the Yuliangzi and the Campanian Belly River microfloras for limited available data, it is obvious that they are similar in the dominance of tricolpate and tricolporate pollen in the angiosperm pollen, the absence of Wodehouseia and the presence of only a few species of Aquilapollenites and the above mentioned fern spores.