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一、概况禾口盆地位于福建宁化县西部,西与江西石城盆地断续相连,面积约230平方公里,呈一狭长的北北东向展布、向西南开口的箕状断陷盆地(图1)。由于其含有特征的蚌类动物群等多门类化石,对福建和邻区自垩纪地层的划分对比及我国东部侏罗、白垩系的分界,都有着重要意义。因而,禾口盆地地层的划分对比及生物群研究,受到省内外地层古生物工作者的重视。
I. Overview The Hekou basin is located in the west of Ninghua County in Fujian Province and connected intermittently with the Shicheng River basin in Jiangxi Province. The area is about 230 square kilometers and shows a narrow north-east-east distribution and a relief-shaped rift basin to the southwest 1). It is of great significance for the division of the Cretaceous strata in Fujian and its adjacent areas and the boundary of the Jurassic and Cretaceous in the eastern part of China due to its multi-species fossils such as the mussel group with its characteristic features. Therefore, the stratigraphic division and the study of biota in Hekou basin have been paid more attention by the paleontologists in and outside the province.