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On the age of the Upper Cretaceous transgression between Regensburg and Neuburg an der Donau (Bavaria, southern Germany)

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Abstract:

The basal marine units of the Danubian Cretaceous Group of Bavaria, the Regensburg Formation of the Regensburg–Kelheim area and the Wellheim Formation of the Neuburg–Solnhofen area, have been dated by means of macrofossil biostratigraphy and stratigraphic events. Based on the presence of Mantelliceras mantelli (J. Sowerby), the base of the Regensburg Formation is of early Early Cenomanian age (M. mantelli Zone). Up-section, a mass-occurrence of Inoceramus virgatus virgatus Schlüter indicates the middle M. dixoni Zone of the Late Early Cenomanian. Based on the presence of Inoceramus crippsi crippsi Mantell and Inoceramus hoppenstedtensis Tröger, also the Wellheim Formation starts with the lower Lower Cenomanian M. mantelli Zone. The recognition of the crippsi Event in the lower part of the formation provides further stratigraphic constraints for the age of the Cenomanian transgression in that region. The early Early Cenomanian age for the bases of these lowest marine formations of the Danubian Cretaceous Group places the underlying terrestrial Schutzfels Formation into the Lower Cretaceous. The Early Cenomanian sea already inundated wide regions north of the Landshut–Neuöttinger Hoch, and the shoreline position was north of Solnhofen and Regensburg at that time. The marine onlap of the lower Danubian Cretaceous Group during the Cenomanian was eustatically controlled and diachronous as in most other places around the Mid-European Island.

Keywords: BIOSTRATIGRAPHY; CENOMANIAN; DANUBIAN CRETACEOUS GROUP; MACROFOSSILS; PALAEOGEOGRAPHY; TRANSGRESSION

Document Type: Research Article

DOI: http://dx.doi.org/10.1127/0077-7749/2010/0051

Publication date: June 1, 2010

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