摘要
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。
Abstract
Plenty of dinoflagellates and acritarchs are firstly discovered in theLate Cretaceous Dalanshan formation of Sanshui Basin,Guangdong Province.Two assemblages recognized in the Formation,from bottom to top,areas follows:1.The assemblage,in which pollen,spores and are predominat but with sparse plank tonic algaeindicating a near-shore transitional environment;2.The assemblage.The content of phytoplankton in this assemblageis equal to,or much greater than,that of pollen and spores,and rich ingenera and species,whereas Pediastrum degenerated.Most of dinoflagellatesin the Formation are small in size.with thin outer membranes and sparseornaments,clear girdle and apex,obscure tabulates,archaeopyle is unseen,“nucleus”is present near the ventral surface.These features may indi-cate that the sediments were deposited in brackish water and the Late Cre-taceous transgression had some influence on this area.The depositionalenvironment of this assemblage might be favorable for the oil genesis.Five new genera are described in this paper,they are ,and ,all together14 new species.
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