摘要
本文仅描述松辽盆地白垩纪与海侵有关的青山口组一段(赛诺曼期)和嫩江组一、二段(坎佩尼期)的沟鞭藻类1新属、11新种和1新联合种。
As two sets of major oil-forming black mudstones, Member 1 (Cenomanian) of the Qingshankou Formation and Members 1—2 (Campanian) of the Nenjiang Formation are widely distributed in the Songliao Basin and yield well-developed microphytoplanktons, including abundant dinocysts, a small number of acritarchs and some rare freshwater green algae. The dinoflagellate assemblage from Member 1 of the Qingshankou Formation consists of seven genera with 12 species dominated by the species belonging to the genera Kiokansium Stover et Evitt, 1978 and Dinogymniopsis gen. nov., representing a lagoonal condition of relatively deep water like the present Maracaibo Lake. The Dinoflagellate assemblage from Members 1—2 of the Nenjiang Formation comprises 11 genera and 15 species mainly characterized by the abundance of Cleistosphaeridium Davey et al., 1966 and Dinogymniopsis gen. nov., representing a transgressive open lake environment. Both assemblages are considered as of the brackish water biotas found from the two Cretaceous transgressive beds in the Songliao Basin. This paper only describes 1 new genus, 11 new species and 1 new combined species of dinoflagellates related to the transgression.
出处
《古生物学报》
CAS
CSCD
北大核心
1992年第1期17-29,20-29+133-136,共13页
Acta Palaeontologica Sinica
关键词
白垩纪
松辽盆地
海侵
沟鞭藻类
Cretaceous, Songliao Basin, cysts of dinoflagellate, transgressive, brackish water.
