Die Forschungsbohrung Schneidlingen 1/2018 als Schlüsselprofil im Obereozän/Unteroligozän der Subherzynen Senke (speziell Egelner Mulden)

The research borehole Schneidlingen 1/2018 was drilled in the southern Egeln Syncline at the end of August to the beginning of September 2018. It was terminated at 70 m final depth and provided a complete core of the marine stratigraphic sequence from the Silberberg Formation over the Rupelian Basal Sand to the lower 15 m of the Rupelton Formation. The borehole was geophysically logged. This paper deals with the lithological profile documentation, the sampling, the geophysics and the results of the biostratigraphical investigations. The investigations confirm the presence of two parasequences in the Silberberg Formation (Latdorfian) as well as the transition from the nannoplankton zone NP21 into NP22 at the top of the Silberberg Formation. For the first time, a complete profile of the Silberberg Formation could be examined for pteropods by high resolution sampling. Especially the Creseis mass occurrences allow a very precise basin-wide correlation. The extraordinarily glauconite-rich, often intensely green Rupelian Basal Sand is completely decalcified and did not yield any biostratigraphically relevant fossils. Nannoplankton of zone NP23 was found in the Rupelian Clay Formation. The mollusc and fish fauna is characteristic for the early Rupelian reg.