AbstractMiocene sediments were investigated near the south-eastern border of the Bohemian Massif in the Lower Austrian Molasse Basin. A 35.4 metres long core was taken in the area north of Limberg where the Burgschleinitz Fm., Zogelsdorf Fm. and Zellerndorf Fm. were sampled. They show a fining upward sequence reaching from coarse grained sand with gravels, fossil rich middle and fine sand to fine laminated silty clay. Throughout the section foraminifera, ostracods, sea urchin spines and phytoclasts could be observed from sieved residues of 21 bulk samples. Representatives of the allochthonous Halkyardia sp. known from the Eocene and Oligocene were found and recognised for the first time in Austria. Beside benthic foraminifera, observed throughout the sequence, planktic foraminifera are only documented in the lower two formations. The lack of planktic foraminifera in the Zellerndorf Fm. is a result of post-sedimentary processes like water-flow which led to the precipitation of secondary fibrous gypsum. The existence of a CCD can be excluded due to the evidence of benthic taxa indicating shallow neritic to upper bathyal conditions from bottom to top of the core. Apart from that, benthic foraminifera indicate a temperate and normal marine environment. Geochemical analyses of the Zogelsdorf Fm. indicate an oxygen-rich environment with high calcareous values. In contrast higher sulphur values, framboidal pyrite and benthic foraminifera indicate dysoxic bottom conditions in the Zellerndorf Fm. Due to investigated warm- and cold-water planktic foraminifers weak upwelling conditions can be suggested. In all three formations very similar Eggenburgian and Ottnangian foraminiferal faunas are recognized. Amphicoryna ottnangiensis is characteristic for the Ottnangain and appears in the middle part of the Zellerndorf Fm.