ISBN 3-931689-04-2

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The benthic foraminifers from the White Chalk of the Isle of Rügen (Lower Maastrichtian, Northeastern Germany). - The Isle of Rügen is the type locality of foraminifers described by HAGENOW (1842), REUSS (1862), MARSSON (1878), and FRANKE (1925, 1928). The taxonomy, palaeoecology and stratigraphy of the associations of benthic foraminifers is revised. The foraminiferal fauna is rich and well preserved. A total of 231 species from 103 genera is described and figured. Eight species (Cribrebella obtusa, Favolagena supracretacea, Procerolagena fistulae, Pygmaeoseistron cretaceum, Bolivina pumila, Epistominitella minuta, Ruegenia rara, Dublinia? auricula) and two genera (Ruegenia, Morozovia) are described as new. The association is highly diverse and monotonous without distinct changes throughout the section of 90 m thickness, covering the complete late Early Maastrichtian. A palaeoenvironmental interpretation of the region during the late Early Maastrichtian is given, based on a detailed quantitative analysis of foraminiferal associations, a comparison with the distribution of other fossil groups and of lithological parameters. The input of organic matter and changes of the water temperature in connection with changing water depth were the most important factors controlling the distribution of benthic foraminifers in the Rügen Chalk. The Chalk Sea of Rügen is considered as a highly productive region within the lower sublittoral in a continental seaway connecting Western and Eastern Europe. The oxygenation of the water/sediment interface was low but not restricting for the benthos during the late Early Maastrichtian. The benthic foraminifers reflect a slightly shallowing sea and a rise of temperatures following after conditions of high productivity as recoded in the upper part of the section. A period of strongly increased productivity probably caused by stronger upwelling processes, is observed within ostracode zone 3 (upper part of the section) within a horizon of very high abundance of radiolarians. Some species were recognized to be indicative of abiotc factors which controlled their environment. The faunistic relationship between Rügen and Nortwestern Germany is closer than that between Rügen and Eastern Poland, particularly for foraminifers from the middle and higher part of the sections. A regional stratigraphy, comprising four zones of benthic foraminifers, is established.

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Updated : 12-30-2021.