三水盆地位于广东省南部北江和西江交会处。盆地内沉积了巨厚的白垩—第三纪地层,自下而上为:三水组、大塱山组、(土布)心组和华涌组。笔者在对这些地层进行孢粉分析的同时,发现了大塱山组含有丰富的沟鞭藻类与疑源类。本文着重于后两类化石的研究,并对当时的沉积环境进行讨论。 Sanshui Basin is located in the southern Guangdong Province, the North River and the intersection of the West River. The basin has a thick sedimentary chalk - Tertiary formation, bottom-up: Sanshui Formation, Dabushan Formation, (soil) heart and Huayong Formation. While analyzing the sporopollen in these strata, the author found that Dadushan Formation is rich in dinoflagellates and suspected sources. This article focuses on the later two types of fossils, and discusses the depositional environment at that time.