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Paleoenvironment and stratigraphy of Late Albian-Early Cenomanian planktonic foraminifera from NE-Germany

by Andreas Prokoph, Ottawa

PROKOPH, A. (1997): Paleoenvironment and stratigraphy of Late Albian-Early Cenomanian planktonic foraminifera from NE-Germany. - Freiberger Forschungshefte C 468. - Paläontologie, Stratigraphie, Fazies, Heft 5. - S. 259-271. - Freiberg 1997.

Abstract

The Boreal late Albian to early Cenomanian planktonic foraminifera assemblages from NE-Germany contain eight species - Hedbergella infracretacea, Hedbergella planispira, Hedbergella delrioensis, Globigerinelloides bentonensis, Heterohelix moremani, Guembelitria cenomana, Schackoina cenomana and Schackoina multispinata. Four newly created regional biozones for the late Albian (Hedbergella planispira zone, Hedbergella infracretacea-1 zone, Globigerinelloides bentonensis zone and Hedbergella infracretacea-2 zone) and one early Cenomanian-zone (Schackoina zone) were compared with the biostratigraphy of the North Sea and the Tethys (ammonites, inoceramids, coccoliths, planktonic foraminifera). The genus Schackoina and larger specimens of Hedbergella infracretacea and Globigerinelloides bentonensis are typical for the Pompecki Swell (NE-part of the basin), which has been interpretated as an oligothropic deeper environment (>200m), with high water transparency. In contrast, the assemblage of the SW-part of the Basin is characterized by smaller, planispiral and biserial planktonic foraminifera and the absence of the genus Schackoina. This environment was interpreted as better stratified, eutrophic water column of less than 200m depth.