摘要
贵州晴隆中营的上二叠统、下三叠统已有详细的研究。本文仅对地层中出现的腹足类化石做生态学的研究。本区上二叠统划分为峨眉山玄武岩组、龙潭组、凉风坡组,下三叠统为飞仙关组。龙潭组是一套碎屑岩夹一层厚层状石灰岩,含海相化石;凉风坡组也是一套碎屑岩,但夹有较多的硅质结核和硅质灰岩层。飞仙关组和凉风坡组之间是连续过渡沉积。根据沉积物和古生物特征推测,从龙潭组到凉风坡组的岩相是由滨海沼泽相变为浅海滨海相(姚兆奇、徐均涛等,1980),海水由龙潭期的时进时退变为长兴期的逐步加深。
This paper deals with the relationship between the shell shape of gastropods and their sedimentary facies. It is suggested, that the bundle forms and bilaterally symmetrical genera, e. g., Aiptospira, Extendilabrum, Ptychobellerophon, Ptychosphaera? and Mirochiliticus, presumably lived in a sand muddy substrate of continental shelves or pelagic environments with their expansive peristomes and up-rolled side lies, whereas those conispiral, and turreted forms mainly lived in ilttoral-swamp environments. The paper also intrdduces the formation mechanism of sinitral and dextral Whorls.
出处
《古生物学报》
CAS
CSCD
北大核心
1989年第5期683-686,共4页
Acta Palaeontologica Sinica
