Abstract
Abstract. The foraminiferal zonation reported here is valid for the marine Oligocene deposits in the Mainz Basin. Thirteen zones and one subzone are defined in the basin facies, which may be correlated biostratigraphically with the current nannoplankton zones and also lithostratigraphically. The zonation for the beach facies, already described by the present author, is incorporated into the scheme. It is possible, therefore, to generate a high resolution foraminiferal biostratigraphical subdivision of the marine Oligocene deposits of the Mainz Basin.
Highlights
The Lower Oligocene deposits of the Mainz Basin are composed of siliciclastic sediments comprising the Pechelbronn Beds, the Bodenheim, the Alzey and the Stadecken formations and the lower part of the Sulzheim Formation, as reported by Grimm et al (2000)
Additional studies made by Doebl (1956), Volk (1956), Thursch (1956) and Sonne (1988) have been followed by detailed biostratigraphical work by Grimm (1991, 1994, 1998)
This zone is defined by the first occurrence of Buliminidae in the Mainz Basin
Summary
The Lower Oligocene deposits of the Mainz Basin (sensu Golwer, 1968) are composed of siliciclastic sediments comprising the Pechelbronn Beds, the Bodenheim, the Alzey and the Stadecken formations and the lower part of the Sulzheim Formation, as reported by Grimm et al (2000). The stratigraphic sections examined (Fig. 1) ranged from the Middle Pechelbronn Beds at the base to the Stadecken Formation at the top (see Fig. 2). The biostratigraphical zonation based on foraminifera reported summarizes the detailed studies carried out during the last ten years on a collection of samples from more than 100 outcrops and boreholes, and updates this zonation to a modern international standard, and combines a modern lithostratigraphical subdivision of the Mainz Basin with a detailed foraminiferal zonation. Adercotryma agterbergi, a very small species, is seldom present in the sediments of the middle Pechelbronn Beds of the Mainz Basin because of environmental reasons.
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