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艾森贝格盆地(Eisenberg Basin)位于梅因茨盆地(Mainz Basin)西南部,为莱茵地堑的一部分。因为化石稀少,这里的地层和梅因茨盆地典型的第三纪地层很难对比。因此,它们的地质时代长期处于争论中。 对于Lautersheim 1钻孔及Lautersheim附近地层露头的孢粉地层学研究表明,这一地区的第三纪可以三分,Lautersheim 1钻孔的下部属于中始新统,相当于Krutzsch的SPP 15/16带;该钻井中部的一部分可置入早渐新世,相当于SPP 19带;这部分可以再分为上下两部分:下部含大量始新世微体植物化石,而上部此类化石很少;上部属于下渐新统,与含孢粉的Sandpit“Friedlich”可以对比。Lautersheim 1钻孔最上部属于晚渐新世(早Chattian),与“过渡层”顶部及“淡水层”底部可以对比。其所含的孢粉和Marxheim组合可以比较,相当于SPP 20 F/G带。
The Eisenberg Basin is located in the southwestern part of the Mainz Basin as part of the Rhine graben. Because of the sparse fossils, the strata here are hard to contrast with the typical Tertiary formations in the Mehndi Basin. Therefore, their geologic age has long been in dispute. Sporellar stratigraphic studies of Lautersheim 1 boreholes and outcrops near Lautersheim indicate that the Tertiary in this area can be one-third, and the lower part of the Lautersheim 1 boreholes belongs to Meso-Eocene, equivalent to Krutzsch’s SPP 15/16 belt ; Part of the central part of the well can be inserted into the Early Oligocene, equivalent to the SPP 19 belt; this part can be subdivided into upper and lower parts: the lower part contains a large number of Eocene microfossil plant fossils, while the upper part of these fossils few; upper part Belonging to the Lower Oligocene, in contrast to the spongled Sandpit “Friedlich”. The uppermost part of the Lautersheim 1 borehole belongs to the late Oligocene (Chattian) and can be contrasted with the top of the “Transitional Layer” and the bottom of the “Freshwater Layer”. The sporopollen contained therein is comparable to the Marxheim combination and corresponds to the SPP 20 F / G band.